Re: lots of write slowing down searches

[Howard Chu <hyc@symas.com>]

Patrick Radtke wrote:

> Hello,
>
> We have some software that occasionally likes to make lots of 
> modifications and adds to OpenLDAP in a short amount of time (5 
> modification per sec for a period of 10 minutes).
>
> When ever this happens all ldapsearches become very slow (servers 
> handle about 16 searches per second normally). They take upwards of 2 
> seconds where previously the were taking 0.05s to answer requests. 
> This causes us various problems with log-ins and email lookups.
>
> We are running 2.1.30, but I ran tests on 2.2.19 and had the same issues.
> we use lbdm as our backend and our indexes are for the standard stuff 
> for unix accounts and groups
>
> I understand that OpenLDAP is read optimized but I am wondering if 
> switching to BDB would provide significantly better search speeds when 
> writes are occurring (ie enough to solve the problem)?

Yes. back-bdb is literally thousdands of times better than back-ldbm in 
a scenario like this.

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