Re: BDB vs. HDB

[Howard Chu <hyc@symas.com>]

Donn Cave 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.

Tuning is of course essential, and hdb lives-n-dies on the IDLcache. 
Many subtree searches will be slower until the cache is prepped, but 
once you've loaded the cache it's fine.

--
 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
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