[pfx] Re: Question on lmdb - setup

On 06.04.2026 06:31, Dr.-Ing. Dieter Jurzitza via Postfix-users wrote:
> Dear listmembers,
> I have a question regarding the correct setup of the lmdb - files. Is it
> correct (and sufficient ...) to execute a script like this:
> 
> LMDBFILES="access canonical helo_access relay_ccerts relay \
>             relocated sasl_passwd sender_canonical transport virtual"
> 
> for i in ${LMDBFILES}; do
>          ${POSTMAP} lmdb:${PFROOTDIR}/$i
> done
> 
> and the (lmdb) files will be used automatically instead of the ascii -
> versions? Or do I have to execute additional steps to have postfix consider
> those lmdb - files on startup?

Postfix does not use ascii versions of these files.  It always uses a
hashed version, - the question is the algorithm/format of the hashed
version, - is it btree: or lmdb: or cdb: or something else.  And this
depends on the software available on your system and the way you use
these maps.

> Would some kind soul explain the difference between the lmdb - files and the
> "normal" ascii - data?

A hashed version has a fast-lookup index in one way or another, usually
it is some binary form.  Ascii files are suitable for editing, while a
hashed version is good for looking up individual entries.

Thanks,

/mjt
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