how to speed up filtering of dn's

[Hanspeter Kunz <hkunz@ifi.uzh.ch>]

Hi all,

I want to find all entries in my ldap directory that contain certain
ou's, e.g.

ldapsearch -x "(ou:dn:=Administration)"

which returns (in my case) all entries that correspond to administrative
staff. The query works but it is slow and puts a high load on the ldap
server. 

I wonder if I can create an index which would speed things up, but I
could not figure out what I should index.

Note that I cannot do this using a specific basedn, because we have
administrative staff in several subtrees of our ldap hierarchy.

Best