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Shutdown Normal or Immediate Hang Waiting for MMON process (Doc ID 1183213.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
Information in this document applies to any platform.


Shutdown immediate/normal hangs. If the startup is restricted, then the shutdown immediate works fine.

  • In the alert.log can be seen that shutdown is waiting for MMON and its secondary processes to be terminated:


  • In the database any SELECT that is accessing V$OSSTAT will hang.


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