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EM 12c: Enterprise Manager 12c Cloud Control Query Consumes High CPU and Causes Log File Sequential Read Wait Events In Production (Doc ID 2339988.1)

Last updated on JANUARY 10, 2018

Applies to:

Enterprise Manager for Oracle Database - Version 12.1.0.4.0 and later
Enterprise Manager Base Platform - Version 12.1.0.4.0 and later
Information in this document applies to any platform.

Symptoms

High CPU Usage generated by Enterprise Manager (EM) 12.1.0.4 Cloud Control

An Automatic Workload Repository (AWR) report on the EM 12.1.0.4 Cloud Control Repository database shows certain queries, issued by EM 12c, consuming database resources, generating contention, and log file sequential read wait events.

One example of an offending query as seen in an AWR report could look like this one:

SELECT /*+RULE*/ATTR_NO, ATTR_NAME, ATTR_TYPE_NAME, ATTR_TYPE_OWNER FROM USER_TYPE_ATTRS WHERE TYPE_NAME IN (SELECT TABLE_NAME FROM ALL_SYNONYMS START WITH SYNONYM_NAME = :1 AND OWNER = 'PUBLIC' CONNECT BY NOCYCLE PRIOR TABLE_NAME = SYNONYM_NAME AND TABLE_OWNER = OWNER UNION SELECT :2 FROM DUAL) ORDER BY ATTR_NO



 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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