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12c Agent consumes excessive CPU when running Qualys scan with high version counts (Doc ID 2119492.1)

Last updated on FEBRUARY 20, 2019

Applies to:

Enterprise Manager Base Platform - Version 12.1.0.4.0 and later
Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
IBM: Linux on System z
Linux x86-64

Symptoms

When Qualys scan (www.qualys.com - scan network for security threats) is run on zLinux server with OEM 12c Agent, causes agent to consume excessive CPU and stops server.

There were several instances of zLinux OEM agent on main production servers consuming upwards of 400% CPU,
and this brings the database to a halt and eventually the agent has to be restarted to release CPU resources.

EM 12.1.0.4.0 Agent patched to EM Bundle Patch 12.1.0.4.10 (21168025) running on zlinux (IBM: Linux on System z).

This CPU resource shortage issue will bring main production system to a halt, and can not process overnight batch work and will breach customer SLAs.

This occurs with JDBC patch 18502187, recommended by notes, 1909576.1 and 1474263.1. 

Cause

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In this Document
Symptoms
Cause
Solution
 Add more physical memory.
 In the interim, before more physical memory can be added to zlinux server, recommend setting "min_free_kbytes" ,
 per Note "Memory Guard Offlines Database Service Due to Low Free Memory (Doc ID 1929994.1)"
 has helped avoid excessive CPU when running Qualys scan.
 With EM repository 12.1.0.2.160119 Database running on Linux x86-64, therefore,
 recommend applying DB 12.1.0.2.160119 patch 20243268 on Linux x86-64,
 which is the CERTIFIED patch level suggested in EM / DB note 1987905.1.
References


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