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Scenarios database automatically dismounts

Dear Members,
                      Could you please tell me in which situation exchange database dismounts? Please help me with Event ID’s too.
I know some scenarios:
1.      Whenever the disk size filled.
2.      Whenever the database exceeds its limit
3.      Whenever the Tlogs limit reaches 1024.

Other than these when will database dismounts?  
3 Solutions
Tony GiangrecoCommented:
Depending on the version of Exchange you have, the mailstore will dismount if it hits a linmit like the 16 gig limit in 2003 w/o SP2 and registry update. With those, it can expand to 75 gig.

All this depends on your server having plenty of free disc space and memory available.
Deepu ChowdaryCommented:
Database dismount can occur in many scenarios.

Mainly this depends on Exchange services, database sizes, log file corruption, Hardware failures, Antivirus scannings etc.
You can use eseutil/mh to see wether the database which was dismounted is in a clean state or in a dirty state.
If its in a clean state you can mount it, if not you have to do a soft repair and if dont works you have to perform a hard repair, which is a time taking process.
Event id's 9518, 9519, 454, 494, 524 etc...

AhmedAliShaikAuthor Commented:
Thank you

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