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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>
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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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Received on Mon Nov 12 2001 - 15:31:28 CST
