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From Emmanuel Lecharny <>
Subject Re: [index review] System indexes
Date Fri, 15 May 2009 09:26:40 GMT
Howard Chu wrote:
> Emmanuel Lecharny wrote:
>> Currently, ObjectClass, entryCSN and UUID are considered as user index.
>> A decent LDAP server can't work well without any of those index. This is
>> obvious for the ObjectClass attribute, but replication heavily depends
>> on the two other index.
>> UUID and entryCSN must be System index. ObjectClass should also be a
>> System index, I think.
>> We already discussed about this, and agreed that UUID and entryCSB must
>> be system index, so we will do the modification. I want to see if you
>> feel the same for the ObjectClass index.
>> One more thing : UUID and entryCSN are single valued attributes. We may
>> want to store them in a Hash instead of a Tree. This has to be
>> evaluated, I guess...
> Considering that the most straightforward syncrepl mechanism involves 
> turning a poll into a search on (entryCSN>={cookie}) I think you're 
> going to want to use an ordered index (e.g. Btree) for entryCSN...
Thanks for your insight, Howard ! So let's get rid of the Exist[ae]nce 
name ... :)

cordialement, regards,
Emmanuel L├ęcharny

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