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Row Cache Latch Contention for DC_USERS While Using VPD. (Doc ID 1417373.1)

Last updated on DECEMBER 19, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.0 to 11.2.0.3 [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Generic (Platform Independent)

Symptoms

Significant Latch: row cache objects contention.

The Dictionary Cache Stats section of the awr report shows high Get Requests for the dc_users row cache. Soft parsing contributes most to the total DB Time. The top SQLs doing huge parse calls (Sqls Ordered by Parse Calls section of the awr report) uses VPD.

The queries in the top list are executed by the users who were granted the "exempt access policy" privilege.

Cause

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In this Document
Symptoms
Cause
Solution
References

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