Re: Cache buffer chain problem

Will keep you posted - thnx for the input.

Jonathan Lewis wrote:

> Are you absolutely sure that it is waiting on this event,
> rather than reporting this event as the last event waited
> for ? Do you have timed_statistics on so that you can
> see the wait_times as it waits. You could try setting
> event 10046 to level 8 to get a trace file which lists all
> the waits that actually occur.
>
> One possible explanation for the random change in
> performance is simply a conflicting job - the simple
> case is that some other job keeps locking data that
> this job wants, and this job waits. Another option is
> that another job keeps updating a lot of the
> data that this job is using, and this job then has to
> run up a huge overhead applying rollback to get
> to a read-consistent state - although 4 seconds to
> 5 minutes sounds a bit extreme.
>
> Can you insert:
> select * from v$session_wait where sid = ...
> select * from v$mystat;
>
> at the beginning and end of the job to see if this gives
> you a clue ?
>
> --
>
> Jonathan Lewis
> Yet another Oracle-related web site: http://www.jlcomp.demon.co.uk
>
> robertchung0909_at_my-deja.com wrote in message
> <8pjjik$di5$1_at_nnrp1.deja.com>...
> >
> >
> >We have a server that is suddenly causing some problem. A job that
> >used to finish in about 3-4 seconds sometimes takes 5 minutes to
> >complete. This problem appears and disappears randomly. We found when
> >the job is taking long, it mostly sits idle waiting on "Cache Buffer
> >Chain". Has anyone seen this behavior? What should we do to alleviate
> >this problem? We are using Oracle 7.3.4 on RS/6000. Thank you in
> >advance.
> >
> >
> >
> >Sent via Deja.com http://www.deja.com/
> >Before you buy.
Received on Mon Sep 18 2000 - 11:52:15 CDT