Deliver.db error: DBERROR db4:

Wil Cooley wcooley at
Wed Aug 9 16:24:08 EDT 2006

On Wed, 2006-08-09 at 19:57 +0200, Rafael Alcalde wrote:
> I have found a lot of problems with all the databases from cyrus: 
> deliver.db, etc.
> In /var/log/maillog we see:
>  DBERROR db4: Logging region out of memory; you may need to increase its 
> size
> Aug  6 11:18:42 mail1 lmtpunix[27875]: DBERROR: opening 
> /var/lib/imap/deliver.db: Cannot allocate memory

I'm working vaguely from memory, but I think it's something like this:

 o As root or cyrus, run 'db_stat -l -d /var/lib/imap/db' and look at 
   the "Log region size".  Mine is set to 96K, which is higher than the 
   documented default of 60K, so I assume it's increased automatically.
 o Create a /var/lib/imap/db/DB_CONFIG file
 o Put in it an entry like: "set_lg_regionmax 262144" (this sets it to 
 o I think you need to run 'db_recover' after this; at least, with the 
   BDB backend for Subversion you have to run 'svnadmin recover' after 
   changing it.  I think Cyrus should be shutdown when you run 

Unfortunately, the documentation for BDB is written for programmers, not
sys admins, and unless you've spent much time looking at the rest of the
docs, it can be pretty impenetrable.  Oddly enough, the sample DB_CONFIG
files that Subversion and OpenLDAP ship with and their docs seem to be
the best resources I've found.

(Search down to "Write the DB_CONFIG file")

Wil Cooley <wcooley at>
Naked Ape Consulting, Ltd
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