Interesting problem

From: David Turner <dnt9000_at_yahoo.com>
Date: Thu, 26 May 2005 11:52:40 -0700 (PDT)
Message-ID: <20050526185240.2748.qmail@web30714.mail.mud.yahoo.com>

We've been using set client info on many of our production systems for some time and this helps us create resource usage reports so we can identify owners of bottlenecks. However, we do have some older systems where this isn't implemented and the transactions are much shorted so it's very hard to identify why some of our sessions have longer response times.

For instance I have a query that scans maybe 4 blocks and returns data instantly when I run it manually but throughout the day periodically it takes well over 10 seconds, which isn't acceptable.

I've set up a script that montors the db every minute but it just doesn't appear to be catching what is causing our normally fast running queries to periodically run long. If any of you have any suggestions on diagnosing this I'd appreciate it.

The main areas I've focused on are

A minute by minute report of v$session and v$process info

Many of the standard performance tuning stats tracked via statspack

Cronjobs

Feed processes

with no luck so far.

Thx, Dave

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Received on Thu May 26 2005 - 15:01:54 CDT