RE: Recursive CPU larger than total CPU used by the database

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Thu, 21 May 2015 18:48:52 +0000
Message-ID: <CE70217733273F49A8A162EE074F64D92828ED7C_at_EXMBX01.thus.corp>

This looks like a double-(or more)-counting error, viz: one Oracle process calling another Oracle process and both of them claiming to own the CPU usage of the second.

If you're licensed to query v$active_session_history you could try capturing the content over that time period, then analyzing all the rows where a session reports itself as on CPU - this might give you a starting clue about what's happening.

Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
_at_jloracle

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From: oracle-l-bounce_at_freelists.org [oracle-l-bounce_at_freelists.org] on behalf of Ls Cheng [exriscer_at_gmail.com] Sent: 20 May 2015 18:31
To: Oracle Mailinglist
Subject: Recursive CPU larger than total CPU used by the database

Hi

I have a 10.2.0.5 single instance database running in HP-UX.

I have noticed that everyday at same time, between 22:00 and 22:30 the recursive cpu shown in v$sysstat is larger than DB CPU from Time Model or CPU used by this session from v$sysstat.

The database claims it consumed 886 second CPU but recursive cpu usage shows 196759 centiseconds (1967 seconds).

This happens consistently everyday at the same time.

Anyone observed this behaviour before?

Thanks

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Received on Thu May 21 2015 - 20:48:52 CEST