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Re: Re: question about ldap performance
Thank you for your kindly help. Now I have found my problem.
I used uid in my dn . It caused index work abnormally. It worked
fine after I used cn in my dn.
>man, 2002-11-11 kl. 03:00 skrev Liu Jinhui:
>> Now I am setting a smtp system (postfix) which need to process
>> query on ldap-server. During the test , I found that when there
>> are simultaneously 200 queries on the ldap server, the query will
>> be very slow. I have to made the timeout of ldap query to 60
>> seconds in postfix. But it is too slow that sending a letter need
>> too long time.
>I can only report on Exim smtp and full ldap services for AUTH, aliases,
>virtual domains etc.
>1: Howard Chu has said that to boost LDAP performance with loads way
>above yours, cut out logging and reduce regex ACLs to a minimum;
>2: On Red Hat 7.2 with Exim 4.10-8 I find no penalty for ldap use
>whatsoever, even though Exim on my machine uses ldaps (SSL, not TLS
>except for esmtp AUTH) for all of the above (runs parallel
>deliveries/emissions). Even though I have to cut out (all including the
>latest Red Hat) nscd on my machine, since it eventually kills ldap for
>some reason or another.
>> I tried to used anonymous no-bind access the ldap to reduce
>> the load on ldap server.
>Has *no* measurable effect with Exim and would be impossible for AUTH
>esmtp, which I use, anyway.
>> I also tried to enlarged the cache in
>> ldapserver.And because I have two smtp server, I set up a local
>> slave ldap in each of the server and point postfix ldap lookups
>> to the local host. But it couldn't solve the problem. It seems
>> that the ldap query becomes the bottleneck of the mail
>Again some really large orgs (major universities in different countries,
>ISPs etc) are running Exim for extremely large accounts, mostly on
>Solaris, and ldap is *no* bottleneck. On the other hand, things like
>virus and spam checking =are= bottlenecks.
>Can only hope this helps. Maybe Sendmail and Qmail people can add their
>So mangt eit ord kunde vori usagt.
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