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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Hot indexes
When this question was asked earlier, one suggestion was to capture =
samples
of the SQL in v$sql, then run it through EXPLAIN PLAN to find SQL =
statements
that are using indexes in this tablespace. I don't recall the success =
or
failure of this method being posted.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com=20
I said it "looked" clear - Riddick
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Mogens N=F8rgaard
Sent: Sunday, July 11, 2004 11:55 PM
To: oracle-l_at_freelists.org
Subject: Re: Hot indexes
If it really is a problem (somebody complaining, devices being=20 overloaded, whatever), then you would need to track which user(s)/apps=20 issued the LIO calls to the datablock adresses of this tablespace.
Tracking of individual LIO calls including the file number, block =
number=20
and number of blocks is externalized in v$session_wait and in 10046=20
trace files (excluding exotic direct memory access methods and probably =
some decent 3rd party tools).
So putting on 10046 level 8 trace on your whole instance will show it,=20 but will require at least 42 GB of storage for the trace files and 42=20 days to interpret the results afterwards :).
Mogens
solbeach_at_cox.net wrote:
> I can see that one tablespace which contains only a few
> indexes is doing many, many reads.
> How do I track back to the SQL & user(s) behind this activity?
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Jul 12 2004 - 07:19:56 CDT
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