Quoting W B Hacker:

>>> Is it possible to have Exim write to a dbm/dbmnz as part of a string  
>>> expansion or are only reads possible?
> Not sure SQLLite is the best of the SQL's for 'sidestepping' the issue where 
> writes may be involved. ISTR it works against a file and has rather basic or 
> 'coarse grained' access locking.

So what? This is about dbm vs. sqlite, not sqlite vs. other rdbms.
FWIW, there's a configurable lock timeout for sqlite (defaults to 5s),
which should be sufficient as long as you are not excessively
updating/inserting, which is unlikely in an MTA.

I'd even say, for most single host purposes sqlite could be faster than
conventional RDBMSs.


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