Database Tuning (MOSC)

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CPU + CPU Wait Time ?

edited Aug 17, 2012 2:45AM in Database Tuning (MOSC) 8 commentsAnswered
Hi,

I am just about starting to diagnose a performance issue that is occuring on our database server (Virtual Machine).  When I run a work load (a process that inserts, updates rows) on this database.  I can see the CPU usage jump up to 80 to 100 % very frequently through out.

I looked at the ASH report and the top wait event came out to be CPU+CPU wait time.

Also, the AWR report states the DB time and CPU as the top two events in the wait event statistics section.

However, I fail to see if there are any other porcesses that are consuming the CPU from the report.  In fact, the CPU goes up even if I run a schema stats.  Could increased I/O be also contributing to increased CPU ?  If so, why would it there be CPU wait time since Oracle.exe is the only major process on the machine.

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