Oracle Database - Enterprise Edition - Version 10.1.0.2 to 126.96.36.199 [Release 10.1 to 11.2] Information in this document applies to any platform.
The following messages are recorded in the alert log every 5 minutes
Restarting dead background process QMNC
1. database startup :
The database has not opened for an undetermined reason, i.e there is no statement:
Completed: ALTER DATABASE OPEN
recorded in the alert.log file.
2. database shutdown :
A process may be preventing the database from shutting down cleanly. As a consequence, this may be causing the qmnc process problems.
This is expected behaviour.
The reason why the database has not opened or shutdown should be investigated.
These messages are a symptom of the problem and not the underlying cause.