Hi, There are a number of 8.1.5 bugs that can cause these symptoms. There is the null-refresh snapshot bug (1348501), and a number of aditional bugs of whihc may or may not be published (but that are referenced in other notes on metalink), including, but not limited to 1000866: HIGH V$SQLAREA.VERSION_COUNT/LOADED_VERSIONS FOR INSERT USING BIND VARIABLES 1522724: HIGH VERSION_COUNT & LOADED_VERSIONS IN V$SQLAREA FOR SQL USING BIND VARIABLES 1210242: Cursors not shared if both TIMED_STATISTICS and SQL_TRACE are enabled 1318267: INSERT AS SELECT may not share SQL when it should
If your high version_count seems to be related to a high number of invalidations (on the same query of course - also in v$sqlarea), then it may not be a bug per se, it may just be due to changed dependecies. If so, you may want to try this script off of Steve Adams' site to see where your invalidations are likely stemming from: http://www.ixora.com.au/scripts/sql/whence_invalidations.sql George --- http://www.pythian.com -- [EMAIL PROTECTED] -- 877-PYTHIAN Smarter than adding another team member, Pythian has new services for supplementing DBAs: get our help with monitoring, 24x7 on-call, daily verifications, storage management, performance and more. ----- Original Message ----- To: <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, January 03, 2002 9:29 AM > > George/Arun, > > I see that bug > > > > > 1640583 > > is present in 8.1.6.3 but I'm > having trouble confirming that > it is present in 8.1.5. > How can I positively confirm > that? > > This bug text does not mention > the timed_statistics issue. > Is there some place where > this connection is documented. > I need something I can show > the application owner > that has more details than the > text of this bug has. The > bug text itself is not very > enlightening. > > I don't see anything else on > Metalink that has more > details. > > Any further advice is greatly > appreciated. > > Cherie Machler > Oracle DBA > Gelco Information Network > > > > > > > > George > Schlossnagle To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > <schlossnagle@py cc: > thian.com> Subject: Re: Shared pool wait for library cache pin > Sent by: > [EMAIL PROTECTED] > > > 01/03/02 12:50 > AM > Please respond > to ORACLE-L > > > > > > > Hi, > > Queries with high version counts can cause library cache latch > contention, as the query must hold that latch during soft parse and has > to go through the entire list of query versions in the data dictionary. > High version_count's are often caused by a high number of invalidations > on the query. Invalidations of a query can be caused by a number of > different things (one is the bug with timed_statistics, another is a bug > present up to 8.1.6.3 in some instances when materialized views are > used), other causes of invalidations are analyzing a dependent table or > index, or truncating a dependent table. > > If this is causing you a problem, the next step is to track down what > the cause of your high version_counts is, and work to correct it or > workaround it (depending on the frequency that the query is executed, a > shared pool flush may remove all versions (or none)). If it's not > causing you a service problem currently, I would still keep an eye on > it, as the version_count for queries rises, the chances of getting > severe contention on the library cache latch increases. > > George > > // George Schlossnagle > // www.pythian.com -- [EMAIL PROTECTED] -- 877-PYTHIAN > // Smarter than adding another team member, Pythian has new services > // for supplementing DBAs: get our help with monitoring, 24x7 on-call, > // daily verifications, storage management, performance and more. > > > On Wednesday, January 2, 2002, at 04:35 PM, [EMAIL PROTECTED] > wrote: > > > > > Yes, there are a handful with more than 400. > > I'm not sure what high is? > > > > Cherie > > > > > > > > "George > > Schlossnagle" To: Multiple recipients > > of list ORACLE-L <[EMAIL PROTECTED]> > > <schlossnagle@py cc: > > thian.com> Subject: Re: Shared pool > > wait for library cache pin > > Sent by: > > [EMAIL PROTECTED] > > > > > > 01/02/02 02:41 > > PM > > Please respond > > to ORACLE-L > > > > > > > > > > > > > > Do any of your queries have a high version_count (visible through > > v$sqlarea)? > > > > George > > > > ----- Original Message ----- > > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > > Sent: Wednesday, January 02, 2002 3:20 PM > > > > > >> > >> We are seeing a lot of shared pool waits (for libary cache pin) on > >> our 8.1.5 web-based application. We are seeing this via > >> Precise/Indepth > >> SQL monitoring tool. > >> > >> I haven't been able to find much documentation on shared pool waits or > >> library cache pins. > >> > >> Can anyone tell me what might be causing this problem? > >> > >> Thanks, > >> > >> Cherie > >> > >> -- > >> 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: George Schlossnagle > > 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: George Schlossnagle 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).
