Re: AQ query from dequeuw procedure not using index -URGENT
Title: RE: AQ query from dequeuw procedure not using index -URGENT When a hint is in your code it will automatically use the cost based optimizer, even if you have the database or session is set to RULE. Therefore you will need stats collected. If you still have problems then look over this paper http://www.evdbt.com/SearchIntelligenceCBO.doc. It will explain some ways to help improve the explain plan selection for the cost optimizer. Casey - Original Message - From: orafaq To: Multiple recipients of list ORACLE-L Sent: Monday, December 09, 2002 4:44 PM Subject: Re: AQ query from dequeuw procedure not using index -URGENT This database is running RULE so analyzing wont help. Outlines is a good idea. Any known issues with outlines in 8173? Thanks Shaleen - Original Message - From: Jamadagni, Rajendra To: Multiple recipients of list ORACLE-L Sent: Monday, December 09, 2002 12:39 PM Subject: RE: AQ query from dequeuw procedure not using index -URGENT Outlines is the way to go as John suggested ... also ensure that all tables related to the queues are analyzed ... regularly. Raj __ Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art! -Original Message- From: John Kanagaraj [mailto:[EMAIL PROTECTED]] Sent: Monday, December 09, 2002 2:49 PM To: Multiple recipients of list ORACLE-L Subject: RE: AQ query from dequeuw procedure not using index -URGENT Shaleen, Have you considered using Outlines? John Kanagaraj
Re: AQ query from dequeuw procedure not using index -URGENT
Title: RE: AQ query from dequeuw procedure not using index -URGENT When a hint is in your code it will automatically use the cost based optimizer, even if you have the database or session is set to RULE. Therefore you will need stats collected. If you still have problems then look over this paper http://www.evdbt.com/SearchIntelligenceCBO.doc. It will explain some ways to help improve the explain plan selection for the cost optimizer. Casey - Original Message - From: orafaq To: Multiple recipients of list ORACLE-L Sent: Monday, December 09, 2002 4:44 PM Subject: Re: AQ query from dequeuw procedure not using index -URGENT This database is running RULE so analyzing wont help. Outlines is a good idea. Any known issues with outlines in 8173? Thanks Shaleen - Original Message - From: Jamadagni, Rajendra To: Multiple recipients of list ORACLE-L Sent: Monday, December 09, 2002 12:39 PM Subject: RE: AQ query from dequeuw procedure not using index -URGENT Outlines is the way to go as John suggested ... also ensure that all tables related to the queues are analyzed ... regularly. Raj __ Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art! -Original Message- From: John Kanagaraj [mailto:[EMAIL PROTECTED]] Sent: Monday, December 09, 2002 2:49 PM To: Multiple recipients of list ORACLE-L Subject: RE: AQ query from dequeuw procedure not using index -URGENT Shaleen, Have you considered using Outlines? John Kanagaraj
Re: AQ query from dequeuw procedure not using index -URGENT
It's oracle AQ internal query so cant change it. I have already tried it without the hint and it does use the index but again can't change the query. - Original Message - To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Monday, December 09, 2002 12:49 PM > > Shaleen, > > The use of FIRST_ROWS hint with an order by clause is ridiculous. The hint > is ignored. > > Raj > > > > > > John Kanagaraj > > [EMAIL PROTECTED]> cc: > Sent by: Subject: RE: AQ query from dequeuw procedure not using index -URGENT > [EMAIL PROTECTED] > om > > > December 09, > 2002 02:49 PM > Please respond > to ORACLE-L > > > > > > > Shaleen, > > Have you considered using Outlines? > John Kanagaraj > Oracle Applications DBA > DBSoft Inc > (W): 408-970-7002 > > So WHO is the Reason for the Season?! Write me for details! > > ** The opinions and statements above are entirely my own and not those of > my > employer or clients ** > > > -Original Message- > Sent: Monday, December 09, 2002 10:04 AM > To: Multiple recipients of list ORACLE-L > > > All, > > We are using a third party application (Retek Warehouse management) which > uses AQ as communication mechanism between processes. The problem we are > facing is that the AQ query behind Dequeue is doing a full tablescan on > queue table which is causing about 5Billion logical reads/day and is > bringing the DB to its knees. > > Following is the query which I gleaned from tracing the process > > select /*+ FIRST_ROWS */ qt.rowid, qt.msgid, qt.corrid, qt.priority, > qt.delay, qt.expiration, qt.retry_count, qt.exception_qschema, > qt.exception_queue, qt.chain_no, qt.local_order_no, qt.enq_time, > qt.time_manager_info, qt.state, qt.enq_tid, qt.step_no from > PAR3214.GENERICTCP qt where q_name = :1 and state = :2 order by q_name, > state, enq_time, step_no, chain_no, local_order_no for update skip locked > > The procedure call is following > DBMS_AQ.DEQUEUE( 'par3214.' || qname, queueopts, msgprops, msg_obj, msgid > ); > > Since this is an internal query, I can not change the HINT ( Itested that > removing the hint drops logical reads from 2400 to 3). > > Any ideas? > > Thanks > Shaleen > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: > 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.com -- Author: orafaq 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: AQ query from dequeuw procedure not using index -URGENT
Title: RE: AQ query from dequeuw procedure not using index -URGENT This database is running RULE so analyzing wont help. Outlines is a good idea. Any known issues with outlines in 8173? Thanks Shaleen - Original Message - From: Jamadagni, Rajendra To: Multiple recipients of list ORACLE-L Sent: Monday, December 09, 2002 12:39 PM Subject: RE: AQ query from dequeuw procedure not using index -URGENT Outlines is the way to go as John suggested ... also ensure that all tables related to the queues are analyzed ... regularly. Raj __ Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art! -Original Message- From: John Kanagaraj [mailto:[EMAIL PROTECTED]] Sent: Monday, December 09, 2002 2:49 PM To: Multiple recipients of list ORACLE-L Subject: RE: AQ query from dequeuw procedure not using index -URGENT Shaleen, Have you considered using Outlines? John Kanagaraj
RE: AQ query from dequeuw procedure not using index -URGENT
Shaleen, The use of FIRST_ROWS hint with an order by clause is ridiculous. The hint is ignored. Raj John Kanagaraj [EMAIL PROTECTED]>cc: Sent by: Subject: RE: AQ query from dequeuw procedure not using index -URGENT [EMAIL PROTECTED] om December 09, 2002 02:49 PM Please respond to ORACLE-L Shaleen, Have you considered using Outlines? John Kanagaraj Oracle Applications DBA DBSoft Inc (W): 408-970-7002 So WHO is the Reason for the Season?! Write me for details! ** The opinions and statements above are entirely my own and not those of my employer or clients ** -Original Message- Sent: Monday, December 09, 2002 10:04 AM To: Multiple recipients of list ORACLE-L All, We are using a third party application (Retek Warehouse management) which uses AQ as communication mechanism between processes. The problem we are facing is that the AQ query behind Dequeue is doing a full tablescan on queue table which is causing about 5Billion logical reads/day and is bringing the DB to its knees. Following is the query which I gleaned from tracing the process select /*+ FIRST_ROWS */ qt.rowid, qt.msgid, qt.corrid, qt.priority, qt.delay, qt.expiration, qt.retry_count, qt.exception_qschema, qt.exception_queue, qt.chain_no, qt.local_order_no, qt.enq_time, qt.time_manager_info, qt.state, qt.enq_tid, qt.step_no from PAR3214.GENERICTCP qt where q_name = :1 and state = :2 order by q_name, state, enq_time, step_no, chain_no, local_order_no for update skip locked The procedure call is following DBMS_AQ.DEQUEUE( 'par3214.' || qname, queueopts, msgprops, msg_obj, msgid ); Since this is an internal query, I can not change the HINT ( Itested that removing the hint drops logical reads from 2400 to 3). Any ideas? Thanks Shaleen -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: 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: AQ query from dequeuw procedure not using index -URGENT
Title: RE: AQ query from dequeuw procedure not using index -URGENT Outlines is the way to go as John suggested ... also ensure that all tables related to the queues are analyzed ... regularly. Raj __ Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art! -Original Message- From: John Kanagaraj [mailto:[EMAIL PROTECTED]] Sent: Monday, December 09, 2002 2:49 PM To: Multiple recipients of list ORACLE-L Subject: RE: AQ query from dequeuw procedure not using index -URGENT Shaleen, Have you considered using Outlines? John Kanagaraj 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.*2
RE: AQ query from dequeuw procedure not using index -URGENT
Shaleen, Have you considered using Outlines? John Kanagaraj Oracle Applications DBA DBSoft Inc (W): 408-970-7002 So WHO is the Reason for the Season?! Write me for details! ** The opinions and statements above are entirely my own and not those of my employer or clients ** -Original Message- Sent: Monday, December 09, 2002 10:04 AM To: Multiple recipients of list ORACLE-L All, We are using a third party application (Retek Warehouse management) which uses AQ as communication mechanism between processes. The problem we are facing is that the AQ query behind Dequeue is doing a full tablescan on queue table which is causing about 5Billion logical reads/day and is bringing the DB to its knees. Following is the query which I gleaned from tracing the process select /*+ FIRST_ROWS */ qt.rowid, qt.msgid, qt.corrid, qt.priority, qt.delay, qt.expiration, qt.retry_count, qt.exception_qschema, qt.exception_queue, qt.chain_no, qt.local_order_no, qt.enq_time, qt.time_manager_info, qt.state, qt.enq_tid, qt.step_no from PAR3214.GENERICTCP qt where q_name = :1 and state = :2 order by q_name, state, enq_time, step_no, chain_no, local_order_no for update skip locked The procedure call is following DBMS_AQ.DEQUEUE( 'par3214.' || qname, queueopts, msgprops, msg_obj, msgid ); Since this is an internal query, I can not change the HINT ( Itested that removing the hint drops logical reads from 2400 to 3). Any ideas? Thanks Shaleen -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- 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).
