Re: Getting a Library Cache dump
- From: Hemant K Chitale <hkchital@xxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 12 Feb 2004 23:02:07 +0800
I am on 8.1.7.2
Steve Adams's kgl_bucket_count script has come up with a recommended value of 6
but I will run a few iterations to validate it.
Unfortunately, I will be getting an opportunity to change _kgl_latch_count and
_kgl_bucket_count only once in 2 months.
Hemant
At 02:11 AM 12-02-04 -0800, you wrote:
>Hemant:
>
>You didn't mention the version. From 9.2 and above level 3 dumps the
>statistics and hash table summary. In earlier versions it dumps some
>more details about the objects pinned in the lib cache.
>
>Your understanding is right about the latch distribution. But you need
>to see the number of buckets (_kgl_bucket_count) and the distribution
>of library cache to confirm the busyness (!) of the child latches.
>
>Regards,
>Gopal
>
>
>--- Hemant K Chitale <hkchital@xxxxxxxxxxxxxx> wrote:
> >
> > I am encountering Library Cache latch contention.
> >
> > On the 4 CPU server, I have 5 Child latches to the
> > Library Cache Latch. I need to verify if only one
> > particular latch is busier.
> >
> > Is a "alter session set events 'immediate trace name library_cache
> > level 3';"
> > the right command to dump to a trace file ?
> > The trace file shows multiple entries for
> > "latch=0" to "latch=4"
> > I did a count on the trace file and got
> > 7528 entries for latch=0
> > 8002 entries for latch=1
> > 8137 entries for latch=2
> > 7926 entries for latch=3
> > 7726 entries for latch=4
> >
> > Is my interpretation that the latches are equally busy
> > valid ?
> > Would _kgl_latch_count help ?
> >
> > Hemant K Chitale
> > http://hkchital.tripod.com
> > ----------------------------------------------------------------
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>
>=====
>Have a nice day !!
>------------------------------------------------------------
>Best Regards,
>K Gopalakrishnan,
>Bangalore, INDIA.
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Hemant K Chitale
Oracle 9i Database Administrator Certified Professional
http://hkchital.tripod.com {last updated 24-Jan-04}
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