One of our Oracle servers went down rather badly last night, and we have been unable to bring it online since. Attempting to startup each instance results in:
SQL> Connected to an idle instance. SQL> ORA-00449: background process 'MMAN' unexpectedly terminated with error 7446 ORA-07446: sdnfy: bad value '' for parameter . SQL> Disconnected
After running this, none of the instances are online. The listener reports that is running, at least.
The first instance (asdb) in the order has a number of (mostly repetitive sections) in its alert.log, but nothing in there seems particularly likely. The other instances have blank (but writeable) alert.log files.
Where should I investigate to try and get this back online?