Thanks for the suggestions. I already know what the SQL is, and which latch is waited for (by looking it up in v$latch_children). The latch does show the number of gets increasing over time, but the session's seq# in v$session_wait _does not change_, which shows that it's been waiting on the same latch (the same wait event) for over 40 minutes. This is what's puzzling me.
--- Deepak Thapliyal <[EMAIL PROTECTED]> wrote: > Paul , > > try joining the v$session with v$sqlarea to find > offending sql harassing the cache buffers chains.. > > here is a sample sql u could use .. > > select sql_text > from v$sqlarea, v$session > where v$sqlarea.address= v$session.sql_address and > v$sqlarea.hash_value = v$session.sql_hash_value > and sid='Your Sid From V$session wait for latch#66'; > > find the offending sql and tune it .. > > cache buffer chains latch means that your SQL is badly > written and is performing a considerably higher # of > LIO's .. explian plan the sql and see if you can use > indexes .. also analyze your table and indexes .. post > dump from v$session wait for wait=0 (waiting state) .. > so other list members an give you more suggestions > > Deepak > > --- "Gogala, Mladen" <[EMAIL PROTECTED]> wrote: > > Try v$latch_children > > > > -----Original Message----- > > Sent: Monday, November 12, 2001 2:30 PM > > To: Multiple recipients of list ORACLE-L > > > > > > I have a puzzling problem: a session is apparently > > waiting on a "cache > > buffers chains latch" forever (well, for 40 minutes > > and counting, so > > far); seq# in v$session_wait is static. "tries" is > > 0. > > > > latch free > > > > address > > > > C000000004708BC0 > > number > > > > 66 > > tries > > 0 > > 00 > > When examining the latch in question (using the > > address from > > v$session_wait.p1raw), I'm not seeing any change in > > the get, misses, > > etc. statistics. It's as though a process has the > > latch and won't let > > go. Any ideas from the list as to where I look > > next? > > > > TIA, > > > > Paul Baumgartel > > > > > > __________________________________________________ > > Do You Yahoo!? > > Find a job, post your resume. > > http://careers.yahoo.com > > -- > > Please see the official ORACLE-L FAQ: > > http://www.orafaq.com > > -- > > Author: Paul Baumgartel > > 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: Gogala, Mladen > > 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). > > > __________________________________________________ > Do You Yahoo!? > Find a job, post your resume. > http://careers.yahoo.com > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Deepak Thapliyal > 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). __________________________________________________ Do You Yahoo!? Find a job, post your resume. http://careers.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Paul Baumgartel 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).
