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 <deepakthapliyal_at_yahoo.com> 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" <MGogala_at_oxhp.com> 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
> >
> >
> > __________________________________________________
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> > --
> > Author: Paul Baumgartel
> > INET: treegarden_at_yahoo.com
> >
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>
> __________________________________________________
> 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: deepakthapliyal_at_yahoo.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing
> Lists
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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: treegarden_at_yahoo.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Mon Nov 12 2001 - 16:43:00 CST
