Repairing the mail database

Hi all,
There are indications on my server that the mail database should probably be repaired. Is it safe to simply stop the mail service and hit the Repair button in Server Admin->Mail->Maintenance->Database? Should a database be repaired on a regular basis as preventative maintenance?
I'm not an IT person. I work for a startup and I drew the short straw one day (no offense to IT people). I'm terrified of hitting the Repair button for fear of losing years worth of important email.
This morning, my server was reporting "DBERROR db4: Logging region out of memory" over and over again. I had a hardware upgrade scheduled anyway, so the server was shut down and new RAM installed.
After restarting the server, IMAP was crashing every minute with "signaled to death by 11". I noticed it crashed each time one particular user accessed mail so I reconstructed that user's mailbox and since then, IMAP crashed three times but has since run smoothly for over an hour.
I have never tried repairing the mail database since the server was installed in 2005.
I appreciate your thoughts!
- Tim
G5 Xserve, Mac OS X 10.4.11

Tim,
the Cyrus database should only be reconstructed if needed and usually is quite stable.
"DBERROR db4: Logging region out of memory"
This is not a RAM issue. It means the underlying Berkeley DB has not enough cache memory assigned.
Can happen because of a broken database or because you have many many users. Since your server has been running for a long time fine, I would assume it was because of the broken db.
The reconstruct button in Server Admin, usually doesn't help. You are better off using mailbfr (available free here: http://osx.topicdesk.com/mailbfr/ )
Use mailbfr -m username to fix single users.
If your problems persist, you may need to do a full reconstruction of the Cyrus db (which will cause the loss of read/unread flags).
If in doubt, post more log entries related to the Cyrus DB errors.
HTH,
Alex

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