This question has been asked & answered before. See the mailing list archives & the FAQ.
For example
http://www.openldap.org/lists/openldap-software/200202/msg00231.html
http://www.openldap.org/faq/data/cache/42.html
and http://www.openldap.org/faq/data/cache/190.html
-----Original Message-----
From: Jatin Nansi [mailto:jatin.nansi@timesgroup.com]
Sent: Tuesday, February 26, 2002 11:44 AM
To: 'openldap-software@openldap.org'
Subject: Indexing LDAP entries
Hi,
I understand that adding indexing information to the ldap database
will make lookups several times faster. But I do not understand exactly
what does pres,eq,approx,sub,none mean.
Is there anywhere i can find out the meanings of these terms and when
to use these?
Thanks
Jatin