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AWR Snapshots Periodically Not Generating Automatically. MMON Stuck on 'external table read'. (Doc ID 2729835.1)

Last updated on AUGUST 06, 2021

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 12.1 to 19]
Information in this document applies to any platform.


AWR snapshots are not generated automatically on a regular schedule.  This problem occurs intermittently.

Generating an AWR snapshot manually succeeds, however.

The MMON background process is in charge of AWR snapshot generation.  Examination of a hanganalyze trace, during the time of incident, shows that MMON is trying to execute PL/SQL function, DBMS_QOPATCH.GET_OPATCH_LSINVENTORY, but is stuck on an extremely long, external-table read.  The function, skudmir(), appears within the short stack.




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