Re: BDB vs. HDB

[Quanah Gibson-Mount <quanah@stanford.edu>]

--On Thursday, March 03, 2005 9:51 AM -0800 Donn Cave 
<donn@u.washington.edu> wrote:

> On Thursday, March 3, 2005, at 09:01 AM, Matthew J. Smith wrote:
> > Given a brand new OpenLDAP 2.2.23 installation, is there any reason to
> > continue to use BDB instead of HDB, or can I safely move everything to
> > HDB?  Do the Berkley 4.2.52+ db_* tools support HDB?  I recall a
> > problem
> > with db_verify once upon a time...
>
> One thing to test would be performance on queries with the
> search base different from the database suffix.  If you see
> the problem I thought I was seeing, hdb will be an order of
> magnitude worse in this case.  That was with an older version,
> 2.2.17 I think, and of course the usual caveats with respect
> to tuning parameters.

HDB relies heavily on the idlcache.  If you do not properly configure the 
system with a large enough idlcache, you will see issues around queries.

--Quanah


--
Quanah Gibson-Mount
Principal Software Developer
ITSS/Shared Services
Stanford University
GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html