[hyc_symas]

You can already get a 10x improvement just by switching from SQL to LDAP. SQL parsing is expensive and inefficient, even with pre-compiled queries.

Writing indexers is pretty tedious; I personally would use something that has already done this for me. Like OpenLDAP.

[netforay]

So a directory server can be a replacement for SQL? Do any one use it for that purpose? I always thought they are both completely different requirements. I will look into the possibility. Thanks for the suggestion.