Performance Issues While Monitoring the Unified Audit Trail of an Oracle12c Database (Doc ID 2063340.1)

Last updated on AUGUST 11, 2017

Applies to:

Enterprise Manager for Oracle Database - Version 12.1.0.1.0 to 12.1.0.5.0 [Release 12.1]
Oracle Database - Enterprise Edition - Version 12.1.0.1 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.

Symptoms

While using EM Cloud Control 12c to monitor the Unified audit trail of an Oracle12c database, you observe high CPU usage.

The problem may also be observed from SQL*Plus when querying the UNIFIED_AUDIT_TRAIL view. If there are a large number of audit records in the Unified audit trail then query performance can be really slow.

After the Unified audit trail is purged using the DBMS_AUDIT_MGMT package, the CPU usage is much less.

Cause

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