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reqStart<= slow


I'm trying to retrieve change events from accesslog DB (all with today's
RE24). I tried searching with this filter:

(&(reqDN=cn=Test-Mail-Gruppe 1,dc=example,dc=com)(reqStart<=20120413180000Z))

This turned out to be quite slow though. reqDN is indexed and there are only
two possible entries. Using a filter reqStart>= even when negated with (!())
is pretty fast.

I really wonder why that is.

Ciao, Michael.

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