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Oracle SQL Advisor Questions

edited May 23, 2013 6:51AM in SQL Performance (MOSC) 3 commentsAnswered
I'm using Oracle 11g R2 (11.2.0.2.0) on SLES 11 SP2 64bit.

I have a few questions pertaining to Oracle SQL Advisor

I have used this documentation:

http://docs.oracle.com/cd/E14072_01/server.112/e10820/statviews_3032.htm

My questions are:

1. The documentation claims elapsed_time and cpu_time are in seconds, I can't quite believe this from the analysis of my statements it must be in milliseconds or some other metric of time, can anyone confirm this?

2.  Also the descriptions of precost and postcost are not particularly helpful to me, can someone explain them further? What does the cost relate to io / cpu / something else. Is there anyway to translate the cost to time savings? Does a postcost half that of precost correspond to twice the performance or just less overhead?

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