EM 12c: High Heap Usage by OMS Due to RacMetricCollectorThread and RacTopActHistChartMetric Classes, Leading to OMS Hang
Last updated on MARCH 21, 2016
Applies to:Enterprise Manager for Oracle Database - Version 220.127.116.11.0 and later
Information in this document applies to any platform.
18.104.22.168 OMS with 22.214.171.124 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;
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