Questions about backup files in /var/imap/db

[Daniel Qian]

Ken Murchison <ken at oceana.com> said:

> 
> 
> Daniel Qian wrote:
> > In the /var/imap/db directory of my email server I noticed several backup 
> > files:
> > __db.001  __db.002  __db.003  __db.004  __db.005  log.0000000001 
mailbox.dump
> > I figure I may use these files to restore messages in mailboxes. But I 
> > couldn't find any documentation as to how these files are created and how 
I 
> > could use them to restore mailboxes. Anyone can give me some ideas how 
they 
> > work or point me to some resources where I can get to know how?
> 
> These files are for restoring the mboxlist.db, they can not be used to 
> restore messages.  If you deleted a message file and don't have a 
> backup, you're screwed.
> 
> -- 
> Kenneth Murchison     Oceana Matrix Ltd.
> Software Engineer     21 Princeton Place
> 716-662-8973 x26      Orchard Park, NY 14127
> --PGP Public Key--    http://www.oceana.com/~ken/ksm.pgp
> 
> 
>

How could I restore the mboxlist.db from these files? My mboxlist.db file is 
a small file but how come these __db.00X files are much larger?
I tried ctl_mboxlist -u < mailbox.dump but didn't succeed.

-- 
Best Regards,
Daniel Qian