Interesting indeed... I didn't see a version number in your note, but I am assuming that it is 8.1.7.x. We have also had some _very_ strange occurrences of 'library cache lock' / 'library cache pin' problems - sessions en-masse went into this state during high activity times on a Solaris based 8.1.7.3 Apps 11i DB supporting about 300 users. [One would have thought that lib cache pins/locks arose from voluntary/involuntary compiles of stored proc/packages caused by Duhlevelopers changing code on the sly]. We tightened up code changes, but this still occurred. We finally traced it down to a bug - one of the sessions obtains a 'row cache lock' for manipulating the dd cache for a specific table, and then 'hangs' and many other session queue behind this one with lib cache pins/locks on that same table. Oracle of course told us to upgrade to 8.1.7.4 - and we did after a long round of testing. And this occurred again yesterday - and Oracle is telling us to go 9.2.x as it was _really_ fixed in 9... Apparently this occurs when either a MV refresh on that object takes place, or a combination of TRUNCATEs (possibly on Partitioned tables) and INSERTs take place at the same time, during heavy load. Both these situations were likely in our case.
I think a ML search of certain keywords would generate a bug list of sufficient size! John Kanagaraj Oracle Applications DBA DB Soft Inc Work : (408) 970 7002 Listen to great, commercial-free christian music 24x7x365 at http://www.klove.com ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >Sent: Thursday, July 31, 2003 4:59 PM >To: Multiple recipients of list ORACLE-L >Subject: Interesting Locking Problem > > >List, > >Below is the description of a locking problem I ran into >today. Any help >to figure out what was happening here would be appreciated. Maybe >I was overlooking something obvious, but I hope not. :) > >An MS Word version is available at: > >http://www.cybcon.com/~jkstill/CIM_enqueue_wait_2003_07_31.doc > >as it may be a little easier to read. > >---------------------- > > >I ran into a rather interesting problem today, and I am hoping that >someone can help me determine what was happening here. > >The app owner informed me that there were some problems with >our CIM app >this morning. > >As this app sometimes has issues with locking, I first checked <snip> -- 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).
