Chronological model

I need help to understand time model statistics and wait events, I understand that statistical model time is divided into two trees, one for the background processing carried out by the database instance itself and one for the foreground treatment (treatment performed on behalf of an application). In the foreground tree are the time for treatment, measurement process that do not expect. My question is:

All measures in the foreground process tree is a part of the time processor, for example, if I see a DB CPU TIME of 4.4% and an elapsed time of sql in the 90s, I can't assume it's 90% 4.4% and the rest of the DB spend their waiting time?

I know that the statistics of time DB indicates the duration of treatment accumulated elapsed time of not-idle sessions.

The image you posted is from book Chris Antognini ALBUMS - do you have a copy? The answer to your question is in the paragraphs following the figures.

Example:

  • From time to time DB's CPU
  • From time to time DB is SQL execute elapsed time
  • From time to time DB is PL/SQL execution elapsed

BUT you can simply add the three components together because

  • Some of the DB CPU comes from the SQL execute elapsed time
  • Some of the DB CPU comes the duration of execution of PL/SQL
  • etc.

In order to do not you talk about 90% or 4.4% - maybe that 4.4 percent is CPU used in the treatment of PL/SQL and a bit of it is used in the SQL - you can't tell of this set of statistics.

Concerning

Jonathan Lewis

Tags: Database

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