Re: Searches with dereferncing causing high CPU load.

On Mon, Nov 16, 2015 at 03:13:11PM +0000, Mark Cairney wrote:

We're having severe performance issues for any query with alias dereferencing set to "always".

Any query with this causes the CPU to spin up to 100% and if we have a number of these concurrently the machine will become unresponsive.

I hit something similar a while ago using mdb:

http://www.openldap.org/its/index.cgi/Software%20Bugs?id=8146

We're using OpenLDAP 2.4.42 with the old hdb backend.

We do have a large number of aliases (~63,000). Could this be the cause?

It would be worth checking that you have indexed the objectclass attribute.

I prefer to avoid aliases...

Andrew