|OpenLDAP Faq-O-Matic : OpenLDAP Software FAQ : Configuration : SLAPD Configuration : Performance Tuning : DNS Name Resolution and Performance Issues|
|If you are experiencing performance problems with slapd and its clients, where updates appear to be taking an unusually long time, check to see if your servers and/or clients machine names and IP address are in the DNS for both name queries and reverse queries (IP -> name). If they aren't, then the machines are trying to do DNS lookups and are failing only after a long timeout.|
Either correct the information in the DNS or use the hosts file on the servers and clients to identify the machines.
This situation is common in networks that use DHCP to supply IP addresses.
After some reading, it seemed appropriate to index our DNS records like this:
# Database indexing index objectClass pres,eq index aRecord pres,eq index sOARecord pres,eq index nSRecord pres,eq index associatedDomain eq index cNAMERecord eq index ipHostNumber eqAfter the changes, simple hostname lookup times went from 1.74 seconds to 0.04 seconds. Yippee!!
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