EM 12c: High Heap Usage by OMS Due to RacMetricCollectorThread and RacTopActHistChartMetric Classes, Leading to OMS Hang (Doc ID 2101440.1)

Last updated on MARCH 21, 2016

Applies to:

Enterprise Manager for Oracle Database - Version 12.1.0.7.0 and later
Information in this document applies to any platform.

Symptoms

12.1.0.4 OMS with 12.1.0.7 Database Plugin is being used to monitor multiple RAC databases from the EM Console.

At certain times, the heap usage by the OMS is found to be increasing linearly. Analyzing the OMS heap dump shows the below objects as the biggest consumers:

oracle.sysman.emo.rac.perform.metric.rt.RacMetricCollectorThread
-> oracle.sysman.emo.rac.perform.metric.rt.RacTopActHistChartMetric
-> java.util.Vector size = 244;
-> java.util.Object[244];

 

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms