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Event Monitor (EMON) Process Constantly Consuming CPU (Doc ID 1603844.1)

Last updated on JANUARY 11, 2023

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


Event Monitor (EMON) worker process is consuming CPU.

Multiple stacks from the process obtained via 

connect / as sysdba

oradebug setospid 1379

or use  the following to find EMON process

In 11g ps -ef | grep EMON

In 12c ps-ef |grep ennn

oradebug SHORT_STACK

have the form

Oracle pid: 43, Unix process pid: 1379, image: oracle@feltux3154 (E000)


which indicates it is stuck in a network write.




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