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Re: tuning searches
At 10:16 AM 5/15/00 -0500, Vinod Nair wrote:
>In a compound search, such as
>is the order of evaluation left-to-right ?
In OpenLDAP, yes.
>I'm assuming the first expression prunes the search
>space for the 2nd, and so forth. In that case, it
>would make sense to place the "most restrictive"
>expression up front (and have it indexed).
>Also, how is the "search base" used to prune the search ?
Depends upon the version of OpenLDAP and configuration.
In some versions, DN sub index was enabled by default. However,
I believe it is off in current versions.
>Is this used to get an appropriate "range" from the underlying btree ?
No. back-ldbm treates the underlying datastore as a simple
key/value system. It may or may not be a btree.
>Or is the base DN being used in some other way to prune the search space ?
If a substr DN index is available, it is used.