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 18.104.22.168 to 22.214.171.124.0 [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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