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Database Performance Problem Caused by Missing OLS Index (Doc ID 1271151.1)

Last updated on FEBRUARY 04, 2020

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


The performance of the database operations is considerably slowed down when OLS policies are enabled. The AWR reports show a large number of waits on wait events like "latch free" and "latch: cache buffers chains".
The 2 statements below are found among the statements that appear in the top 10 of the "SQL ordered by Elapsed Time" and "SQL ordered by Gets" areas:


The problem appears when the OLS policies are enabled. One of the conditions for this problem to occur is to have a very large number of policies.


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