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How much overhead will 10046 trace carry when it's enabled?

edited May 15, 2017 2:10AM in SQL Performance (MOSC) 3 commentsAnswered

Summary:

Platform:  Linux, Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production.

A report started to run late on my production database,

- I noticed in ASH, one particular insert SQL_ID appeared around 70% in the overall sample (per second),

- When I checked SQLSTATS for the insert, elapsed time was significantly lower than the number of samples reported (during the cycle),

- Then I analyzed the ASH data and noticed - samples are not continuous (difference between two samples is also random, varied between 02 and 05 seconds),

- I checked CPU utilization at the time - CPU was 60% idle, so it's not due to system resources busy during that time,

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