AWR Snapshots Are Not Being Created Because MMON Is Not Being Respawned
(Doc ID 2023652.1)
Last updated on JANUARY 10, 2025
Applies to:
Oracle Database Cloud Schema Service - Version N/A and laterGen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- MMON process died and subsequent AWR reports are therefore not getting generated
- ps -ef |grep mmon shows that MMON is not running:
orcl2:/home/oracle>ps -ef |grep mmon
oracle 2708 2689 0 14:03 pts/0 00:00:00 grep mmon - MMON process should automatically be respawned but it is not
- Alert log shows following messages:
IPC Send timeout detected. Sender: ospid 5964414 [oracle@rdcgtsdelad03p (MMON)]
Receiver: inst 2 binc 1478883330 ospid 3212084
minact-scn: got error during useg scan e:12751 usn:11
minact-scn: useg scan erroring out with error e:12751
IPC Send timeout detected. Sender: ospid 5964414 [oracle@rdcgtsdelad03p (MMON)]
Cause
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