Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
Hi Hemant, How I dislike being immortalised ;) The note basically quoted me word for word on my feedback and that's fine, it's certainly an improvement on what was previously suggested (and yes, Oracle asked for my permission). A point I would add though is that the whole subject of how Oracle indexes function and the various cases when one should or should not rebuild indexes is not black and white and is not easily covered in a couple of paragraphs. There are always exceptions and oddities, the key is determining when these scenarios arrive and taking the appropriate action. Many books/articles emphasise the need to rebuild generally and often, I'm suggesting the emphasis should be far more considered and practical. If anyone reading the note now questions the rebuild generally and often approach, then my comments serve their intentions. Cheers Richard - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Friday, October 24, 2003 1:19 AM Yes. However, every time he has replied to me, he has been confident that he IS right. Mind you, Richard, you are immortalised now ! Hemant At 05:04 PM 22-10-03 -0800, you wrote: So now the blame rests solely on Richard for any material in the note that's wrong. :) Check the latest update: http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_data b ase_id=NOTp_id=182699.1 Pete Controlling developers is like herding cats. Kevin Loney, Oracle DBA Handbook Oh no, it's not. It's much harder than that! Bruce Pihlamae, long-term Oracle DBA -Original Message- Millsap Sent: Wednesday, October 22, 2003 2:35 AM To: Multiple recipients of list ORACLE-L Oops, I didn't see that part. Thanks for the catch, Hemant. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Hemant K Chitale Sent: Tuesday, October 21, 2003 10:15 AM To: Multiple recipients of list ORACLE-L Unfortunately, the lines Unoccupied space on indexes occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore, indexes whose columns are subject to intensive value change should be rebuilt periodically, since they become naturally fragmentated. are still visible in Note 182699.1 Hemant At 08:29 AM 20-10-03 -0800, you wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
Yes. However, every time he has replied to me, he has been confident that he IS right. Mind you, Richard, you are immortalised now ! Hemant At 05:04 PM 22-10-03 -0800, you wrote: So now the blame rests solely on Richard for any material in the note that's wrong. :) Check the latest update: http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_datab ase_id=NOTp_id=182699.1 Pete Controlling developers is like herding cats. Kevin Loney, Oracle DBA Handbook Oh no, it's not. It's much harder than that! Bruce Pihlamae, long-term Oracle DBA -Original Message- Millsap Sent: Wednesday, October 22, 2003 2:35 AM To: Multiple recipients of list ORACLE-L Oops, I didn't see that part. Thanks for the catch, Hemant. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Hemant K Chitale Sent: Tuesday, October 21, 2003 10:15 AM To: Multiple recipients of list ORACLE-L Unfortunately, the lines Unoccupied space on indexes occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore, indexes whose columns are subject to intensive value change should be rebuilt periodically, since they become naturally fragmentated. are still visible in Note 182699.1 Hemant At 08:29 AM 20-10-03 -0800, you wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
sold out na lahat-yung Tower 3 sa Eastwood is only for Lease?? At 11:34 AM 10/17/2003 -0800, you wrote: The article states that leaf blocks are not reused, which is indeed incorrect, and has been for a very long time. Hemant K Chitale [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/17/2003 11:42 AM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: I wonder if it is not necessary to rebuild indexes is also a myth. It IS in some cases necessary 1. Indexes on monotonically increasing values [eg Conrurrent_Request_ID based on a Sequence or even on date columns which signify when the record is created] if the table is also purged by the same columns frequently 2. Because the disk space used by an Index can be inordinately larged after a couple of years and index fast_full_scans are impacted Have you administered an Oracle Applications database ? hemant At 03:29 AM 17-10-03 -0800, you wrote: Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jerome Roa INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
So now the blame rests solely on Richard for any material in the note that's wrong. :) Check the latest update: http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_datab ase_id=NOTp_id=182699.1 Pete Controlling developers is like herding cats. Kevin Loney, Oracle DBA Handbook Oh no, it's not. It's much harder than that! Bruce Pihlamae, long-term Oracle DBA -Original Message- Millsap Sent: Wednesday, October 22, 2003 2:35 AM To: Multiple recipients of list ORACLE-L Oops, I didn't see that part. Thanks for the catch, Hemant. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Hemant K Chitale Sent: Tuesday, October 21, 2003 10:15 AM To: Multiple recipients of list ORACLE-L Unfortunately, the lines Unoccupied space on indexes occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore, indexes whose columns are subject to intensive value change should be rebuilt periodically, since they become naturally fragmentated. are still visible in Note 182699.1 Hemant At 08:29 AM 20-10-03 -0800, you wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
Unfortunately, the lines Unoccupied space on indexes occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore, indexes whose columns are subject to intensive value change should be rebuilt periodically, since they become naturally fragmentated. are still visible in Note 182699.1 Hemant At 08:29 AM 20-10-03 -0800, you wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
Oops, I didn't see that part. Thanks for the catch, Hemant. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Hemant K Chitale Sent: Tuesday, October 21, 2003 10:15 AM To: Multiple recipients of list ORACLE-L Unfortunately, the lines Unoccupied space on indexes occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore, indexes whose columns are subject to intensive value change should be rebuilt periodically, since they become naturally fragmentated. are still visible in Note 182699.1 Hemant At 08:29 AM 20-10-03 -0800, you wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing:
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Thanks for the info Cary. Jared On Mon, 2003-10-20 at 09:29, Cary Millsap wrote: Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about index fragmentation have been removed. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - SQL Optimization 101: 12/8-12 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Richard Foote Sent: Friday, October 17, 2003 6:29 AM To: Multiple recipients of list ORACLE-L Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jared Still INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
My experience in contacting Oracle regarding modifying of notes on MetaLink has not been very satisfying. I did take the opportunity to voice my dissatisfaction by using the poll at the top of the article to indicate that I would not recommend this article to others. Jared Richard Foote [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/17/2003 04:29 AM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
The article states that leaf blocks are not reused, which is indeed incorrect, and has been for a very long time. Hemant K Chitale [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/17/2003 11:42 AM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: I wonder if it is not necessary to rebuild indexes is also a myth. It IS in some cases necessary 1. Indexes on monotonically increasing values [eg Conrurrent_Request_ID based on a Sequence or even on date columns which signify when the record is created] if the table is also purged by the same columns frequently 2. Because the disk space used by an Index can be inordinately larged after a couple of years and index fast_full_scans are impacted Have you administered an Oracle Applications database ? hemant At 03:29 AM 17-10-03 -0800, you wrote: Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
If they don't have time to fix bugs, how do you expect them to spend timeto correct documentation and technical notes? Now many people pay to buy documentation nowadays ... Raj Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art ! -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]Sent: Friday, October 17, 2003 3:35 PMTo: Multiple recipients of list ORACLE-LSubject: Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:The article states that leaf blocks are not reused, which is indeed incorrect, and has been for a very long time.**This e-mail message is confidential, intended only for the named recipient(s) above and may contain information that is privileged, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please immediately notify corporate MIS at (860) 766-2000 and delete this e-mail message from your computer, Thank you.**5
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
I wonder if it is not necessary to rebuild indexes is also a myth. It IS in some cases necessary 1. Indexes on monotonically increasing values [eg Conrurrent_Request_ID based on a Sequence or even on date columns which signify when the record is created] if the table is also purged by the same columns frequently 2. Because the disk space used by an Index can be inordinately larged after a couple of years and index fast_full_scans are impacted Have you administered an Oracle Applications database ? hemant At 03:29 AM 17-10-03 -0800, you wrote: Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
Title: Message
Well, in a small step in our defense, it DOES state at the top of the
note:
*
This article is being
delivered in Draft form and may contain
errors. Please use the
MetaLink "Feedback" button to advise
Oracle of any issues related
to this article.
*
and in an even larger step, the author of the document
has been asked to review and correct it.
Pete
"Controlling
developers is like herding cats."
Kevin
Loney, Oracle DBA Handbook
"Oh
no, it's not. It's much harder than
that!"
Bruce
Pihlamae, long-term Oracle DBA
-Original Message-From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]Sent: Saturday, October 18, 2003 5:35
AMTo: Multiple recipients of list ORACLE-LSubject: Re:
re Rebuilding Indexes in Oracle Apps -- was RE:
RE:The article states
that leaf blocks are not reused, which is indeed incorrect, and has been for a very long
time.
Hemant K Chitale
[EMAIL PROTECTED] Sent by: [EMAIL PROTECTED]
10/17/2003 11:42 AM
Please respond to ORACLE-L
To:
Multiple recipients of list ORACLE-L
[EMAIL PROTECTED] cc:
Subject:Re: re Rebuilding Indexes in
Oracle Apps -- was RE: RE:I wonder if "it is not necessary to rebuild
indexes" is also a myth.It IS in some cases necessary1.
Indexes on monotonically increasing values [eg Conrurrent_Request_ID
based on a Sequenceor even on date columns which signify when the
record is created] if the table is alsopurged by the same columns
frequently2. Because the disk space used by an Index can be
inordinately larged after a couple of yearsand index fast_full_scans
are impactedHave you administered an Oracle Applications database
?hemantAt 03:29 AM 17-10-03 -0800, you wrote:Hi
Hemant,One word perfectly describes the Metalink article you
highlighted:Crap ;)A nice example of how
Oracle Corp is the greatest myth generator of themall !! It's all
rather sad and embarressing isn't.Thanks for the headsup.
Anyone in a position to get the note removed
?CheersRichard Quoting
Metalink Note 182699.1 bde_rebuild.sql Validates and
RebuildsFragmentated Indexes (8.0-9.0)
Index fragmentation occurs when a key value changes, and the index row
is deleted from one place (Leaf Block) and inserted into
another. Deleted Leaf Rows are not reused. Therefore
indexes whose columns are subject to value change must be
rebuilt periodically since they becomenaturally fragmentated.
An index is considered to be 'fragmentated' when more
than 20% of its LeafRows space is empty because of the
implicit deletes caused by indexed columns valuechanges.
Fragmentated indexes degrade the performance of index
range scanoperations.--Please see the
official ORACLE-L FAQ: http://www.orafaq.net--Author: Richard
Foote INET: [EMAIL PROTECTED]Fat City
Network Services -- 858-538-5051
http://www.fatcity.comSan Diego, California
-- Mailing list and web hosting
services-To
REMOVE yourself from this mailing list, send an E-Mail messageto:
[EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and inthe
message BODY, include a line containing: UNSUB ORACLE-L(or the name of
mailing list you want to be removed from). You mayalso send the
HELP command for other information (like subscribing).Hemant K
ChitaleOracle 9i Database Administrator Certified ProfessionalMy
personal web site is : http://hkchital.tripod.com--
Please see the official ORACLE-L FAQ: http://www.orafaq.net--
Author: Hemant K ChitaleINET: [EMAIL PROTECTED]Fat
City Network Services -- 858-538-5051
http://www.fatcity.com San Diego,
California-- Mailing list and web hosting
services-To
REMOVE yourself from this mailing list, send an E-Mail messageto:
[EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and inthe message
BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing
list you want to be removed from). You mayalso send the HELP command
for other information (like
subscribing).
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
- Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Saturday, October 18, 2003 4:42 AM Hi Hermant, I wonder if it is not necessary to rebuild indexes is also a myth. It might be but I've yet to hear it. It's certainly not something I've ever claimed, unless it's a quote taken out of context (the start and end are missing) which would be unfortunate. I would re-phrase it as it is *rarely* necessary to rebuild indexes and it would be a hell of a lot more accurate than many quotations on this subject. So let's not confuse and cloud the issue. It IS in some cases necessary Yes it is but the point I'm trying to make that the some cases are relatively *rare*. The emphasis as I often hear it is that indexes usually/always need to be rebuilt. This is simply incorrect. The Metalink note claims that deleted space is not reused. This is not only incorrect but helps promote the myth that indexes hence need frequent rebuilding. One incorrect claim promotes one incorrect conclusion. 1. Indexes on monotonically increasing values [eg Conrurrent_Request_ID based on a Sequence As I've previously stated *but* and it's a big BUT only if there are subsequent sparse deletions. No spares deletions, no rebuilds are necessary. What ratio of indexes in Oracle financials actually meet this criteria ? Monotonically increasing *and* sparse deletions. or even on date columns which signify when the record is created] if the table is also purged by the same columns frequently Similar case to the above. But this implies a specific range of index values being deleted which results in a range of index nodes being emptied. These blocks therefore *can* be reused. If records are subsequently inserted *at the same rate* they are being purged, then again index rebuilds are potentially unnecessary. 2. Because the disk space used by an Index can be inordinately larged after a couple of years and index fast_full_scans are impacted How ? We covered one case above. Another is that we simply reduce the volume of data within a table (and hence index). How does time result inordinately enlarged indexes ? As previously discussed, Oracle is very efficient in the way it reuses space within an index, suggestions that indexes just become unnecessarily enlarged over time are generally false. Have you administered an Oracle Applications database ? No, but I have a number of SAP applications and they suffer from the same bad advice that indexes generally require frequently rebuilding. In actual fact, the ratio of indexes that actually benefit from rebuilding is tiny and then it's generally the table that needs rebuilding more so than the indexes directly and then the tiny tiny ratio of indexes that remain generally need coalescing rather than rebuilding. Indexes that exist in Oracle Applications are not special, they follow the same rules as those indexes in SAP, or in-house applications, etc. Hemant, take a look at Jonathan Lewis's article When Should You Rebuild An Index at www.dbazine.com . In it he concludes Will the total cost of rebuilding the index be a reasonable price to pay for the resulting benefit to the system ? The answer to this question is frequently a resounding NO. In fact, sometimes the overall impact of rebuilding an active index will be detrimental to the system. However, there are still plenty of misconceptions about indexes that result in DBAs the world over wasting valuable time and effort rebuilding indexes unnecessarily. Amen to that !! Cheers ;) Richard hemant At 03:29 AM 17-10-03 -0800, you wrote: Hi Hemant, One word perfectly describes the Metalink article you highlighted: Crap ;) A nice example of how Oracle Corp is the greatest myth generator of them all !! It's all rather sad and embarressing isn't. Thanks for the headsup. Anyone in a position to get the note removed ? Cheers Richard Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds Fragmentated Indexes (8.0-9.0) Index fragmentation occurs when a key value changes, and the index row is deleted from one place (Leaf Block) and inserted into another. Deleted Leaf Rows are not reused. Therefore indexes whose columns are subject to value change must be rebuilt periodically since they become naturally fragmentated. An index is considered to be 'fragmentated' when more than 20% of its Leaf Rows space is empty because of the implicit deletes caused by indexed columns value changes. Fragmentated indexes degrade the performance of index range scan operations. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this
Re: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared,Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. Hi Rafiq, I haven't been receiving all the mail from this list so I don't know the full thread and it doesn't appear a mail I sent a few days ago regarding all this ever made it so I could be wasting my time again. But everytime I see comments as in the above, a voice in my head says "do something, do something". So I'll try again. Having lots of deletes and inserts of course doesn't necessarily mean fragmentation. Theseso-called holes are fully re-usableand in the vast majority of cases results in no substantial issues. Having lots of deletes, inserts and updates rarely requires the index to be rebuilt. Simple little demo for any newbies or those force-fed Oracle myths since child birth ... Firstof all, create a simple table and index. I've intentionally left a value out "in the middle" of a range for extra effect. SQL create table bowie_test (ziggy number); Table created. SQL insert into bowie_test values (1); 1 row created. SQL insert into bowie_test values (2); 1 row created. SQL insert into bowie_test values (3); 1 row created. SQL insert into bowie_test values (4); 1 row created. SQL insert into bowie_test values (6); 1 row created. SQL insert into bowie_test values (7); 1 row created. SQL insert into bowie_test values (8); 1 row created. SQL insert into bowie_test values (9); 1 row created. SQL insert into bowie_test values (10); 1 row created. SQL insert into bowie_test values (100); 1 row created. SQL commit; Commit complete. SQL create index bowie_test_idx on bowie_test(ziggy); Index created. Now analyze the index ... SQL analyze index bowie_test_idx validate structure; Index analyzed. and we see that everything is sweet with no "wasted" deleted space ... SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN-- --- --- 10 0 0 We now delete a number of rows ... SQL delete bowie_test where ziggy in (2,3,4,6,7,8,9,10); 8 rows deleted. SQL commit; Commit complete. And we see that of the 10 leaf rows, 8 are deleted. As Gollum would say "nasty wasted spaces it is, gollum ..." SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN-- --- --- 10 8 112 However, we now insert a new value (notice it's different from any previous value but obviously belongs in the same leaf node as the others) ... SQL insert into bowie_test values (5); 1 row created. SQL commit; Commit complete. SQL analyze index bowie_test_idx validate structure; Index analyzed. SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN-- --- --- 3 0 0 and we see that *all* the "wasted" deleted space within the leaf node has been freed and is available for reuse ... With few exceptions (the key is picking those rare cases), index rebuildsare redundant, wasteful and can actually be "detrimental" to performance. Cheers Richard
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
All of that is fair enough but the number of rows and the values you've chosen fit the point you wished to prove. The value 5 conveniently fits the range for an existing leaf block with empty space. The facts as I understand them are this : Index space freed by deleted entries can be reused ( by subsequent transactions ) so long as the indexed value 'belongs' in the leaf block which has free space. Index leaf blocks are only placed back on the free list when they are empty of entries. This means that given a constantly incrementing index value no free space will be reused unless whole index blocks are emptied by deletes. This is fine for working tables which are constantly filled and (totally) emptied but it can lead to large indexes for tables which preserve small amounts os data across the range of keys. Such monotonically increasing key values are pretty common in my experience. I agree though that index rebuilds are often necessary. For a while now we've had useful commands like coalesce that could combine logically adjacent, sparsely populated leaf blocks at far less cost than a rebuild. Regards, Mike Hately -Original Message- Sent: 16 October 2003 14:29 To: Multiple recipients of list ORACLE-L On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. Hi Rafiq, I haven't been receiving all the mail from this list so I don't know the full thread and it doesn't appear a mail I sent a few days ago regarding all this ever made it so I could be wasting my time again. But everytime I see comments as in the above, a voice in my head says do something, do something. So I'll try again. Having lots of deletes and inserts of course doesn't necessarily mean fragmentation. These so-called holes are fully re-usable and in the vast majority of cases results in no substantial issues. Having lots of deletes, inserts and updates rarely requires the index to be rebuilt. Simple little demo for any newbies or those force-fed Oracle myths since child birth ... First of all, create a simple table and index. I've intentionally left a value out in the middle of a range for extra effect. SQL create table bowie_test (ziggy number); Table created. SQL insert into bowie_test values (1); 1 row created. SQL insert into bowie_test values (2); 1 row created. SQL insert into bowie_test values (3); 1 row created. SQL insert into bowie_test values (4); 1 row created. SQL insert into bowie_test values (6); 1 row created. SQL insert into bowie_test values (7); 1 row created. SQL insert into bowie_test values (8); 1 row created. SQL insert into bowie_test values (9); 1 row created. SQL insert into bowie_test values (10); 1 row created. SQL insert into bowie_test values (100); 1 row created. SQL commit; Commit complete. SQL create index bowie_test_idx on bowie_test(ziggy); Index created. Now analyze the index ... SQL analyze index bowie_test_idx validate structure; Index analyzed. and we see that everything is sweet with no wasted deleted space ... SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN -- --- --- 10 0 0 We now delete a number of rows ... SQL delete bowie_test where ziggy in (2,3,4,6,7,8,9,10); 8 rows deleted. SQL commit; Commit complete. And we see that of the 10 leaf rows, 8 are deleted. As Gollum would say nasty wasted spaces it is, gollum ... SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN -- --- --- 10 8 112 However, we now insert a new value (notice it's different from any previous value but obviously belongs in the same leaf node as the others) ... SQL insert into bowie_test values (5); 1 row created. SQL commit; Commit complete. SQL analyze index bowie_test_idx validate structure; Index analyzed. SQL select lf_rows, del_lf_rows, del_lf_rows_len from index_stats; LF_ROWS DEL_LF_ROWS DEL_LF_ROWS_LEN -- --- --- 3 0 0 and we see that *all* the wasted deleted space within the leaf node has been freed and is available for reuse ... With few exceptions (the key is picking those rare cases), index rebuilds are redundant, wasteful and can actually be detrimental to performance. Cheers Richard
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
At 01:34 PM 14-10-03 -0800, you wrote: Hemant, John, My apologies for the delay. I hadn't logged on to my email last night. Here's the output from my site 11.0.3 Purge Obsolete Workflow Runtime Data set to AGE=90 days [ITEM_TYPE and ITEM_KEY null in parameters] SQL set time on 14:57:42 SQL 14:57:42 SQL select activity_status, count(*) 14:57:46 2 from applsys.wf_item_activity_statuses 14:57:46 3 group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; ACTIVITY COUNT(*) -- ACTIVE 18761 COMPLETE 1039949 DEFERRED 1082 ERROR 5541 NOTIFIED 10489 14:58:03 SQL 14:58:03 SQL 14:58:03 2 14:58:03 3 14:58:03 4 ITEM_TYP ACTIVITY COUNT(*) -- APVRMDER COMPLETE 29739 CREATEPO COMPLETE 154074 POAPPRV COMPLETE 309445 REQAPPRV COMPLETE 546767 14:59:01 SQL Currently I do not have too many rows in the tables but I still plan to rebuild the tables and indexes. Hemant This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Correction. Paragraph 4 should begin, I agree though that index rebuilds are often unnecessary. Mike -Original Message- Sent: 16 October 2003 15:20 To: '[EMAIL PROTECTED]' All of that is fair enough but the number of rows and the values you've chosen fit the point you wished to prove. The value 5 conveniently fits the range for an existing leaf block with empty space. The facts as I understand them are this : Index space freed by deleted entries can be reused ( by subsequent transactions ) so long as the indexed value 'belongs' in the leaf block which has free space. Index leaf blocks are only placed back on the free list when they are empty of entries. This means that given a constantly incrementing index value no free space will be reused unless whole index blocks are emptied by deletes. This is fine for working tables which are constantly filled and (totally) emptied but it can lead to large indexes for tables which preserve small amounts os data across the range of keys. Such monotonically increasing key values are pretty common in my experience. I agree though that index rebuilds are often necessary. For a while now we've had useful commands like coalesce that could combine logically adjacent, sparsely populated leaf blocks at far less cost than a rebuild. Regards, Mike Hately -Original Message- Sent: 16 October 2003 14:29 To: Multiple recipients of list ORACLE-L Hi Rafiq, I haven't been receiving all the mail from this list so I don't know the full thread and it doesn't appear a mail I sent a few days ago regarding all this ever made it so I could be wasting my time again. But everytime I see comments as in the above, a voice in my head says do something, do something. So I'll try again. Having lots of deletes and inserts of course doesn't necessarily mean fragmentation. These so-called holes are fully re-usable and in the vast majority of cases results in no substantial issues. Having lots of deletes, inserts and updates rarely requires the index to be rebuilt. Simple little demo for any newbies or those force-fed Oracle myths since child birth ... demo snipped on space grounds - Mike Hately With few exceptions (the key is picking those rare cases), index rebuilds are redundant, wasteful and can actually be detrimental to performance. Cheers Richard E mail Disclaimer You agree that you have read and understood this disclaimer and you agree to be bound by its terms. The information contained in this e-mail and any files transmitted with it (if any) are confidential and intended for the addressee only. If you have received this e-mail in error please notify the originator. This e-mail and any attachments have been scanned for certain viruses prior to sending but CE Electric UK Funding Company nor any of its associated companies from whom this e-mail originates shall be liable for any losses as a result of any viruses being passed on. No warranty of any kind is given in respect of any information contained in this e-mail and you should be aware that that it might be incomplete, out of date or incorrect. It is therefore essential that you verify all such information with us before placing any reliance upon it. CE Electric UK Funding Company Lloyds Court 78 Grey Street Newcastle upon Tyne NE1 6AF Registered in England and Wales: Number 3476201 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hately, Mike (LogicaCMG) INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Jared, Unfortunately at this stage I cannot quantify in numbers as I have left that job 5 months back. But dealing with Oracle Financials 10.7 with version 7.3.4, I observed it practically that this table and it is indexes (i think 4 or 5 indexes) require special attention for performance reasons. At my last employment that table was also used by customized application specially Manufactruring and stock locator application and heavy usage of inserts and deletes. If indexes were not rebuilt on that tablespace then I have seen that users were complaining about slowness of thier jobs. So I made it a maintenance routine to rebuild indexes on gl_interface table after monthly closing. Apart from this, as you cannot change code in Oracle Financials(although I did) , you to deal with indexes either through rebuilding them at regular intervals (may be six moths or a year) or adding new indexes based on your observation of certain codes. One monthly job called ACCRUAL REBUILD RECONCILIATION was passing 36 hours and I have to add 6 indexes on 2 tables and time went down to 1 hour. In certain codes they were suppresing indexes(perfectly indexed columns) resulting 15 mintues to fetch rows and after correcting that code it took less than second. Now another database of Order Entry System. When I joined I observed a lot of performance issues. After consulting with Development team,tracked all those tables with lot of regular deletes and inserts, rebuilt all indexes and got back 5GB of tablespace and performance was at their peak. All those application was based on RULE optimizer so we were not analyzing any table/indexes but based on experience with those applications, I was tracking those tables with large deletes and inserts through application(not data load) and rebuilding indexes with regular interval to keep smooth performance. In my opinion, we always need performance satisfaction of end user instead of numbers. If you have any specific question, please let me know. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 22:04:24 -0800 The 'better performance' part is what I would like to see some metrics on. How much better? Is it worth the trouble? If your indexes continually build up to the same size, what is being gained by saving some space for a period of time? Thanks, Jared On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. As regard quantification, you many release sufficient amount of space if your usage is higher. Here it was 7.3.4 database so no LMT involved. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 13:19:24 -0800 Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Thanks for the info. Too bad you can't get some metrics to show what was happening. Yes, user satisfaction is the ultimate indicator of tuning success, but there are also metrics to back it up, they just need to be collected before and after. Thanks, Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/16/2003 10:34 AM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate Jared, Unfortunately at this stage I cannot quantify in numbers as I have left that job 5 months back. But dealing with Oracle Financials 10.7 with version 7.3.4, I observed it practically that this table and it is indexes (i think 4 or 5 indexes) require special attention for performance reasons. At my last employment that table was also used by customized application specially Manufactruring and stock locator application and heavy usage of inserts and deletes. If indexes were not rebuilt on that tablespace then I have seen that users were complaining about slowness of thier jobs. So I made it a maintenance routine to rebuild indexes on gl_interface table after monthly closing. Apart from this, as you cannot change code in Oracle Financials(although I did) , you to deal with indexes either through rebuilding them at regular intervals (may be six moths or a year) or adding new indexes based on your observation of certain codes. One monthly job called ACCRUAL REBUILD RECONCILIATION was passing 36 hours and I have to add 6 indexes on 2 tables and time went down to 1 hour. In certain codes they were suppresing indexes(perfectly indexed columns) resulting 15 mintues to fetch rows and after correcting that code it took less than second. Now another database of Order Entry System. When I joined I observed a lot of performance issues. After consulting with Development team,tracked all those tables with lot of regular deletes and inserts, rebuilt all indexes and got back 5GB of tablespace and performance was at their peak. All those application was based on RULE optimizer so we were not analyzing any table/indexes but based on experience with those applications, I was tracking those tables with large deletes and inserts through application(not data load) and rebuilding indexes with regular interval to keep smooth performance. In my opinion, we always need performance satisfaction of end user instead of numbers. If you have any specific question, please let me know. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 22:04:24 -0800 The 'better performance' part is what I would like to see some metrics on. How much better? Is it worth the trouble? If your indexes continually build up to the same size, what is being gained by saving some space for a period of time? Thanks, Jared On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. As regard quantification, you many release sufficient amount of space if your usage is higher. Here it was 7.3.4 database so no LMT involved. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 13:19:24 -0800 Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
You are right. As you agreed our ultimate goal is user satisfaction and I believe in that, may be a old habit. I came into computer area because of our dissatisfaction(being enduser) with our IT shop otherwise professionaly I used to be a qualified professional accountant playing with numbers. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Thu, 16 Oct 2003 14:59:26 -0800 Thanks for the info. Too bad you can't get some metrics to show what was happening. Yes, user satisfaction is the ultimate indicator of tuning success, but there are also metrics to back it up, they just need to be collected before and after. Thanks, Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/16/2003 10:34 AM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate Jared, Unfortunately at this stage I cannot quantify in numbers as I have left that job 5 months back. But dealing with Oracle Financials 10.7 with version 7.3.4, I observed it practically that this table and it is indexes (i think 4 or 5 indexes) require special attention for performance reasons. At my last employment that table was also used by customized application specially Manufactruring and stock locator application and heavy usage of inserts and deletes. If indexes were not rebuilt on that tablespace then I have seen that users were complaining about slowness of thier jobs. So I made it a maintenance routine to rebuild indexes on gl_interface table after monthly closing. Apart from this, as you cannot change code in Oracle Financials(although I did) , you to deal with indexes either through rebuilding them at regular intervals (may be six moths or a year) or adding new indexes based on your observation of certain codes. One monthly job called ACCRUAL REBUILD RECONCILIATION was passing 36 hours and I have to add 6 indexes on 2 tables and time went down to 1 hour. In certain codes they were suppresing indexes(perfectly indexed columns) resulting 15 mintues to fetch rows and after correcting that code it took less than second. Now another database of Order Entry System. When I joined I observed a lot of performance issues. After consulting with Development team,tracked all those tables with lot of regular deletes and inserts, rebuilt all indexes and got back 5GB of tablespace and performance was at their peak. All those application was based on RULE optimizer so we were not analyzing any table/indexes but based on experience with those applications, I was tracking those tables with large deletes and inserts through application(not data load) and rebuilding indexes with regular interval to keep smooth performance. In my opinion, we always need performance satisfaction of end user instead of numbers. If you have any specific question, please let me know. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 22:04:24 -0800 The 'better performance' part is what I would like to see some metrics on. How much better? Is it worth the trouble? If your indexes continually build up to the same size, what is being gained by saving some space for a period of time? Thanks, Jared On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. As regard quantification, you many release sufficient amount of space if your usage is higher. Here it was 7.3.4 database so no LMT involved. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 13:19:24 -0800 Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). _ Concerned that messages may bounce because your Hotmail account has exceeded its 2MB storage limit? Get Hotmail Extra Storage! http://join.msn.com/?PAGE=features/es -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: M Rafiq INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Not
again :)
At
least we have to justify our pay :)
Waleed
Any views or opinions presented in this email are solely
those of the author and do not necessarily represent those of the
company
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]Sent: Wednesday, October 15, 2003
5:19 PMTo: Multiple recipients of list ORACLE-LSubject:
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE:
SeparatePlease explain
why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared
"M Rafiq"
[EMAIL PROTECTED] Sent by: [EMAIL PROTECTED]
10/14/2003 03:49 PM
Please respond to ORACLE-L
To:
Multiple recipients of list ORACLE-L
[EMAIL PROTECTED] cc:
Subject: RE: re Rebuilding Indexes in
Oracle Apps -- was RE: RE:
SeparateJohnWhat about gl_interface table indexes? I think indexes on all
*interface( tables must be rebuild on a regular interval...I was
building indexes on gl_interfaces and fnd_request* tables on monthly
basis.RegardsRafiqReply-To:
[EMAIL PROTECTED]To: Multiple recipients of list ORACLE-L
[EMAIL PROTECTED]Date: Tue, 14 Oct 2003 13:34:24
-0800Hemant,This applies on 11i only. I would rebuild all
indexes supporting theWF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES
tables. I have beenworking on some AOL table(space) problems in the
background and noticed thatin 11i by default, we are not be purging _all_
the WF data that we should bepurging. I believe the current Purge routine
purges activity rows whosepersistence has expired and are marked
'TEMPORARY' and ignores those thatare COMPLETE (see below). My contention
is that it should be deleting oldrows that are COMPLETEd... (Fyi, this is
12+ million rows...) Notes141853.1, 144806.1, 132254.1, 148705.1, 148678.1
may help.You could check this using the following SQLsselect
activity_status, count(*)from applsys.wf_item_activity_statusesgroup
by activity_status;select
item_type,activity_status,count(*)fromapplsys.wf_item_activity_statuses
where activity_status='COMPLETE'group by
item_type,activity_status;Once the 'correct' purge is complete, the
'holey' indexes will need to berebuilt and the WF_ tables
copied/truncated/recopied to shrink the HWM toreasonable
levels.Let me know what your install shows up.John KanagarajDB
Soft IncPhone: 408-970-7002 (W)Grace - Getting something we do NOT
deserveMercy - NOT getting something we DO deserveClick on
'http://www.needhim.org' for Grace and Mercy that is
freelyavailable!** The opinions and facts contained in this
message are entirely mine and donot reflect those of my employer or
customers **-Original Message-Sent: Tuesday, October 14,
2003 8:39 AMTo: Multiple recipients of list
ORACLE-LJohn,I rebuild the FND_CONCURRENT_REQUESTS
indexes every four months [and thetable itself, occassionally].This
Saturday I will also be rebuilding some ALR indexes.Which WorkFlow Indexes
do you rebuild ?HemantAt 11:44 AM 13-10-03 -0800, you
wrote:--Please see the official ORACLE-L FAQ:
http://www.orafaq.net--Author: John Kanagaraj INET:
[EMAIL PROTECTED]Fat City Network Services --
858-538-5051 http://www.fatcity.comSan Diego, California
-- Mailing list and web hosting
services-To
REMOVE yourself from this mailing list, send an E-Mail messageto:
[EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and inthe message
BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing
list you want to be removed from). You mayalso send the HELP command
for other information (like subscribing)._Concerned
that messages may bounce because your Hotmail account has exceeded its 2MB
storage limit? Get Hotmail Extra Storage!
http://join.msn.com/?PAGE=features/es-- Please see the
official ORACLE-L FAQ: http://www.orafaq.net-- Author: M
RafiqINET: [EMAIL PROTECTED]Fat City Network Services
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for other information (like
subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
List, The %INTERFACE% tables (usually) consist of rows that are temporary in nature. The indexes supporting them are 'fragmented' (the term can be argued I suppose). I did test this out on the GL_INTERFACE_N2 index - ANALYZE/VALIDATE and record INDEX_STATS, Rebuild index, ANALYZE/VALIDATE and record INDEX_STATS again. The figures are below, but just to highlight a few: HEIGHT (Index depth) dropped from 3 to 2; BLKS_GETS_PER_ACCESS (expected number of CR reads to get to a row) dropped from 12 to 3; the PCT_USED (percentage of space allocated that is used) increased from 38% to 99%... HEIGHT 3 2 BLOCKS 44804432 LF_ROWS 362409 22552 LF_BLKS 423075 LF_ROWS_LEN 12531538578797 LF_BLK_LEN 79487780 BR_ROWS 422974 BR_BLKS 58 1 BR_ROWS_LEN 134043 1919 BR_BLK_LEN 80288028 DEL_LF_ROWS 339857 0 DEL_LF_ROWS_LEN 119527410 DISTINCT_KEYS 20869 9548 MOST_REPEATED_KEY 38594 8430 BTREE_SPACE 34085664591528 USED_SPACE 12665581580716 PCT_USED38 99 ROWS_PER_KEY17.3659016 2.36196062 BLKS_GETS_PER_ACCESS12.1829508 3.68098031 PRE_ROWS0 0 PRE_ROWS_LEN0 0 For a detailed explanation, look at the definition of INDEX_STATS. YMMV, but you will probably get the most from Non-unique indexes... (as in this case). John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Wednesday, October 15, 2003 2:19 PM To: Multiple recipients of list ORACLE-L Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. As regard quantification, you many release sufficient amount of space if your usage is higher. Here it was 7.3.4 database so no LMT involved. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 13:19:24 -0800 Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). _ Concerned that messages may bounce because your Hotmail account has exceeded its 2MB storage limit? Get Hotmail Extra Storage! http://join.msn.com/?PAGE=features/es -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: M Rafiq INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). _ Concerned that messages may bounce
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
John Thanks foe detailed explanation. Regards Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 14:34:47 -0800 List, The %INTERFACE% tables (usually) consist of rows that are temporary in nature. The indexes supporting them are 'fragmented' (the term can be argued I suppose). I did test this out on the GL_INTERFACE_N2 index - ANALYZE/VALIDATE and record INDEX_STATS, Rebuild index, ANALYZE/VALIDATE and record INDEX_STATS again. The figures are below, but just to highlight a few: HEIGHT (Index depth) dropped from 3 to 2; BLKS_GETS_PER_ACCESS (expected number of CR reads to get to a row) dropped from 12 to 3; the PCT_USED (percentage of space allocated that is used) increased from 38% to 99%... HEIGHT 3 2 BLOCKS 44804432 LF_ROWS 362409 22552 LF_BLKS 423075 LF_ROWS_LEN 12531538578797 LF_BLK_LEN 79487780 BR_ROWS 422974 BR_BLKS 58 1 BR_ROWS_LEN 134043 1919 BR_BLK_LEN 80288028 DEL_LF_ROWS 339857 0 DEL_LF_ROWS_LEN 119527410 DISTINCT_KEYS 20869 9548 MOST_REPEATED_KEY 38594 8430 BTREE_SPACE 34085664591528 USED_SPACE 12665581580716 PCT_USED38 99 ROWS_PER_KEY17.3659016 2.36196062 BLKS_GETS_PER_ACCESS12.1829508 3.68098031 PRE_ROWS0 0 PRE_ROWS_LEN0 0 For a detailed explanation, look at the definition of INDEX_STATS. YMMV, but you will probably get the most from Non-unique indexes... (as in this case). John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Wednesday, October 15, 2003 2:19 PM To: Multiple recipients of list ORACLE-L Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
The 'better performance' part is what I would like to see some metrics on. How much better? Is it worth the trouble? If your indexes continually build up to the same size, what is being gained by saving some space for a period of time? Thanks, Jared On Wed, 2003-10-15 at 18:04, M Rafiq wrote: Jared, Those tables are transit type of tables and depending on your volume of data, there are lot of deletes and inserts all the time resuling index fragmentation(holes due to deletes) and space usage. The rebuilding not only release the space but also reduces the index fragmentation. If you don't have table truncation option for such tables then it is much better to rebuid indexes on such tables at regular interval to release space and for better performance. As regard quantification, you many release sufficient amount of space if your usage is higher. Here it was 7.3.4 database so no LMT involved. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 15 Oct 2003 13:19:24 -0800 Please explain why these indexes must be built. What benefits do you see from it? Are they quantifiable? Jared M Rafiq [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 10/14/2003 03:49 PM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). _ Concerned that messages may bounce because your Hotmail account has exceeded its 2MB storage limit? Get Hotmail Extra Storage! http://join.msn.com/?PAGE=features/es -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: M Rafiq INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Tue, 14 Oct 2003 13:34:24 -0800 Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been working on some AOL table(space) problems in the background and noticed that in 11i by default, we are not be purging _all_ the WF data that we should be purging. I believe the current Purge routine purges activity rows whose persistence has expired and are marked 'TEMPORARY' and ignores those that are COMPLETE (see below). My contention is that it should be deleting old rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help. You could check this using the following SQLs select activity_status, count(*) from applsys.wf_item_activity_statuses group by activity_status; select item_type,activity_status,count(*) from applsys.wf_item_activity_statuses where activity_status='COMPLETE' group by item_type,activity_status; Once the 'correct' purge is complete, the 'holey' indexes will need to be rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM to reasonable levels. Let me know what your install shows up. John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Grace - Getting something we do NOT deserve Mercy - NOT getting something we DO deserve Click on 'http://www.needhim.org' for Grace and Mercy that is freely available! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -Original Message- Sent: Tuesday, October 14, 2003 8:39 AM To: Multiple recipients of list ORACLE-L John, I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and the table itself, occassionally]. This Saturday I will also be rebuilding some ALR indexes. Which WorkFlow Indexes do you rebuild ? Hemant At 11:44 AM 13-10-03 -0800, you wrote: -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). _ Concerned that messages may bounce because your Hotmail account has exceeded its 2MB storage limit? Get Hotmail Extra Storage! http://join.msn.com/?PAGE=features/es -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: M Rafiq INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Rafiq, John What about gl_interface table indexes? I think indexes on all *interface( tables must be rebuild on a regular interval...I was building indexes on gl_interfaces and fnd_request* tables on monthly basis. Indeed the interface tables suffer as well. I would suggest a TRUNCate of these tables after processing monthend (or at an agreed time with the users), so the index will be chopped as well John Kanagaraj DB Soft Inc Phone: 408-970-7002 (W) Disappointment is inevitable, but Discouragement is optional! ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate
Hi, I do rebuild index for table AP_INVOICES_ALL but it seems that no effect on extents. select owner, segment_name, tablespace_name, count(*), sum(bytes) 2 from sys.dba_extents 3 where segment_name like 'AP_INVOICES_N3' and tablespace_name='APX' 4 group by owner, segment_name, tablespace_name result : AP AP_INVOICES_N3 APX 45 46202880 and then : alter index AP.AP_INVOICES_N3 2* rebuild compute statistics online nologging tablespace APX but the extents still as above. any advice? regards On Tue, 14 Oct 2003, John Kanagaraj wrote: Hemant, This applies on 11i only. I would rebuild all indexes supporting the WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: hernawan INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
