High Executions Of Statement "delete from smon_scn_time..." (Doc ID 375401.1)

Last updated on OCTOBER 09, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 10.2.0.4 [Release 10.1 to 10.2]
Information in this document applies to any platform.
***Checked for relevance on 10-Oct-2016***

Symptoms

A delete from smon_scn_time is performing excessive gets and executions as viewed from AWR report:

Buffer Gets Executions Gets per Exec %Total CPU Time (s) Elapsed Time (s)
205,501,888 30,508 6,736.00 54.05 9,733.97 61,180.96  delete from smon_scn_time where...

The AWR report shows the following SQL with  an excessive amount of executions:

delete from smon_scn_time where thread=0 and time_mp = (select min(time_mp) from smon_scn_time where thread=0);

Cause

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