RE: can I measure IO per process?

Thanks Allen. I was thinking about at the OS level. Two reasons for this. One, if there is some non-database process out there (rman, exp, OS tool, ...), I don't skip it. Secondly, if it is a database issue, I can tell quickly if most of the IO is from the top 1,2,3,... processes, and then focus on those with the db tools.  

Henry  

-----Original Message-----
From: Allen, Brandon [mailto:Brandon.Allen_at_OneNeck.com] Sent: Tuesday, February 14, 2006 11:17 AM To: henry_at_itasoftware.com; oracle-l_at_freelists.org Subject: RE: can I measure IO per process?

If you're talking about how to associate IO with an oracle session, you can do something like this:  

select a.sid, a.username, a.osuser, d.spid, c.name, b.value from v$session a, v$sesstat b, v$statname c, v$process d where a.sid = b.sid and a.paddr = d.addr and b.statistic# = c.statistic# and c.name like 'physical%' and value
> 1000 order by b.value;
 

If you want to do it for a non-oracle process at the OS level, I'm not sure how to do that.    

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Henry Poras
Sent: Tuesday, February 14, 2006 8:44 AM To: oracle-l_at_freelists.org
Subject: can I measure IO per process?

I'm currently running on RedHat AS3. On one of our boxes I noticed the CPU was spending most of its time with 'wait io' (wa column in vmstat was 85%-95%). The servicetime as seen from iostat -dk -x was also high, so this was a problem. What I couldn't figure out, and what would be very useful, was how to associate the io with specific processes. Is there a way to do this?

Thanks.

Henry

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