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Re: bdb backend: memp_trickle

I'm using OpenLDAP 2.2.23 and Berkeley DB 4.3.27.

I haven't read much about people using the hdb back-end and for some
reason had the impression that it was being abandoned.  Maybe because
there is no man page on slapd-hdb in the current (2.2.23) release. I
haven't had a chance to read much about it yet or dig through the sources
for the differences in the way the db environment is used in the two

I guess I still have the same question for hdb, though.  Does it somehow
trickle the in-memory changes out to disk or does it only flush
periodically at a checkpoint or when closing the environment?

I wanted to experiment with hdb, but time constraints have caused me to
stick with what I know a little better until after our project at least
gets its first release out.  I just don't know enough about what it does
differently to make guesses as to how to tune it yet or what DB_CONFIG
settings might be relevant.

On Tue, 15 Feb 2005, Quanah Gibson-Mount wrote:

>--On Tuesday, February 15, 2005 10:31 AM -0600 Eric Irrgang
><erici@motown.cc.utexas.edu> wrote:
>> I haven't found any mention of the BDB DB_ENV->memp_trickle method being
>> utilized or discussed in relation to openldap.  Is this something that is
>> deemed to be not worth pursuing or has it simply not yet been addressed?
>> Or is it being addressed and my Google skills just aren't up to par?
>What version of OpenLDAP are you using?
>Have you tried using back-hdb, which is write optimized, but retains the
>same read optimizations as BDB?
>Quanah Gibson-Mount
>Principal Software Developer
>ITSS/Shared Services
>Stanford University
>GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html

Eric Irrgang - UT Austin ITS Unix Systems - (512)475-9342