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Oracle Metric CPU used by this session

Oracle Consulting Tips by Burleson


The CPU used by this session Oracle metric is the amount of CPU time (in 10s of milliseconds) used by a session between when a user call started and ended. Some user calls can complete within 10 milliseconds and as a result, the start and end user-call time can be the same. In this case, 0 milliseconds are added to the statistic.

A similar problem can exist in the reporting by the operating system, especially on systems that suffer from many context switches.  Also see on CPU session used:

Oracle SQL optimizer cost model

v$metricgroup and MMON


You can display CPU for any Oracle user session with this script:


   VALUE/100 cpu_usage_seconds
   v$session ss,

   v$sesstat se,
   v$statname sn

   NAME like '%CPU used by this session%'

   se.SID = ss.SID


   ss.username is not null

order by VALUE desc

For complete scripts to monitor CPU, see the Oracle script download.

This, and many other Oracle performance metrics are discussed in my book "Oracle Tuning" by Rampant TechPress.  You can buy it directly from the publisher and save 30% at this link:



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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