Re: Finding out historical cpu-usage
Date: Tue, 11 Oct 2011 17:04:02 +0300
Message-ID: <OFEAFABADE.7F261C0A-ONC2257926.004CCAA2-C2257926.004D46B7_at_seb.lt>
>i am currently investigating which session consume the most cpu-time per
instance.
just count ON-CPU records from DBA_HIST_ASH... It's an aproximation but quite good.
My understanding is that OEM just do the same thing, at least this is what I saw in OEM queries.
p.s. CPUtime could be TotalTime minus WaitTime. I suppose in reality (truss reality for example) it isn't but well, this is what Oracle thinks :)
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From: Jan-Hendrik Boll <jan.hendrik.boll_at_googlemail.com>
To: oracle-l_at_freelists.org
Date: 2011.10.11 12:33
Subject: Finding out historical cpu-usage
Hi Lister's,
i am currently investigating which session consume the most cpu-time per
instance.
In order to do so i am using the view dba_hist_active_sess_history
Tracking down the time spent waiting for typical wait-events like 'log file sync' seems easy as it is the sum of time_wait for that event.
But how can i find out the CPU-Time?
Is CPU time the sum of wait_time in which the session_state equals 'ON CPU'
?
Any clarification about the meaning of these two columns would be greatly appreciated.
Kind regards,
Jan-Hendrik Boll
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