Re: Surprising event
!! Please do not post Off Topic to this List !!Are you regularly performing the appropriate analysis of optimiser stats? Its not too uncommon for performance to suddenly go over the edge rather than degrade in the nice linear fashion. For example, sorts suddenly needing to go to disk - just not fitting into memory etc hth connor --- Csillag Zsolt [EMAIL PROTECTED] wrote: Hi, We have a cgi that displays data from oracle tables. The program has been running for several months perfectly. Last week every time it started, it seemed to almost freeze the Oracle server , it didn' t end the operation (many Select statements). After several hours of work we removed the /*+ FIRST_ROWS */ hints from some of the selects and the problem went down to 50% ( It woult be a long story to tell all the details). At last we recreated _all_ the indexes and the problem dissapeared, everything was fine again. Question: Should a bad index cause a problem like this and why? If an index is bad how come Oracle doesn' t see it? It is important for me to know that for I don' t want to run in this problem again. Thank you Zsolt Csillag Hungary -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Csillag Zsolt INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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[2]: Surprising event
!! Please do not post Off Topic to this List !! Connor, For the most part I agree, but I have also seen circumstances where a function (in my case) works very consistently for months and then goes totally south right out of the clear blue. This gets especially nerve racking when there are no indications of what the heck has happen, like no locks evident, no alert log messages, the function is still valid, etc I'll finally get everyone using the function to stop for a couple of moments, recompile it with no errors, and it returns back to normal. It's just like the DB makes a odd decision to do something crazy. Dick Goulet Reply Separator Author: =?iso-8859-1?q?Connor=20McDonald?= [EMAIL PROTECTED] Date: 9/13/2001 3:10 AM !! Please do not post Off Topic to this List !!Are you regularly performing the appropriate analysis of optimiser stats? Its not too uncommon for performance to suddenly go over the edge rather than degrade in the nice linear fashion. For example, sorts suddenly needing to go to disk - just not fitting into memory etc hth connor --- Csillag Zsolt [EMAIL PROTECTED] wrote: Hi, We have a cgi that displays data from oracle tables. The program has been running for several months perfectly. Last week every time it started, it seemed to almost freeze the Oracle server , it didn' t end the operation (many Select statements). After several hours of work we removed the /*+ FIRST_ROWS */ hints from some of the selects and the problem went down to 50% ( It woult be a long story to tell all the details). At last we recreated _all_ the indexes and the problem dissapeared, everything was fine again. Question: Should a bad index cause a problem like this and why? If an index is bad how come Oracle doesn' t see it? It is important for me to know that for I don' t want to run in this problem again. Thank you Zsolt Csillag Hungary -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Csillag Zsolt INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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[2]: Surprising event
!! Please do not post Off Topic to this List !! I have noticed in the past that if you pin certain packages or functions in memory, they can become corrupt. They still show their state as being 'VALID', but they are of no use. The only thing I have found to do is recompile. We try to keep packages, etc. out of memory unless they get used a LOT. At 06:20 AM 9/13/01 -0800, [EMAIL PROTECTED] wrote: !! Please do not post Off Topic to this List !! Connor, For the most part I agree, but I have also seen circumstances where a function (in my case) works very consistently for months and then goes totally south right out of the clear blue. This gets especially nerve racking when there are no indications of what the heck has happen, like no locks evident, no alert log messages, the function is still valid, etc I'll finally get everyone using the function to stop for a couple of moments, recompile it with no errors, and it returns back to normal. It's just like the DB makes a odd decision to do something crazy. Dick Goulet Reply Separator Author: =?iso-8859-1?q?Connor=20McDonald?= [EMAIL PROTECTED] Date: 9/13/2001 3:10 AM !! Please do not post Off Topic to this List !!Are you regularly performing the appropriate analysis of optimiser stats? Its not too uncommon for performance to suddenly go over the edge rather than degrade in the nice linear fashion. For example, sorts suddenly needing to go to disk - just not fitting into memory etc hth connor --- Csillag Zsolt [EMAIL PROTECTED] wrote: Hi, We have a cgi that displays data from oracle tables. The program has been running for several months perfectly. Last week every time it started, it seemed to almost freeze the Oracle server , it didn' t end the operation (many Select statements). After several hours of work we removed the /*+ FIRST_ROWS */ hints from some of the selects and the problem went down to 50% ( It woult be a long story to tell all the details). At last we recreated _all_ the indexes and the problem dissapeared, everything was fine again. Question: Should a bad index cause a problem like this and why? If an index is bad how come Oracle doesn' t see it? It is important for me to know that for I don' t want to run in this problem again. Thank you Zsolt Csillag Hungary -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Csillag Zsolt INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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: Michael Barger INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California--
Surprising event
Hi, We have a cgi that displays data from oracle tables. The program has been running for several months perfectly. Last week every time it started, it seemed to almost freeze the Oracle server , it didn' t end the operation (many Select statements). After several hours of work we removed the /*+ FIRST_ROWS */ hints from some of the selects and the problem went down to 50% ( It woult be a long story to tell all the details). At last we recreated _all_ the indexes and the problem dissapeared, everything was fine again. Question: Should a bad index cause a problem like this and why? If an index is bad how come Oracle doesn' t see it? It is important for me to know that for I don' t want to run in this problem again. Thank you Zsolt Csillag Hungary -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Csillag Zsolt INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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).
