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local selectivity estimation - computing frequency of predicates

From: "Avdhoot Kishore Saple" <Avdhoot_Saple(at)infosys(dot)com>
To: <pgsql-performance(at)postgresql(dot)org>
Subject: local selectivity estimation - computing frequency of predicates
Date: 2007-04-13 08:59:30
Message-ID: 54D17EC6EF3C114693F2F8117990AAC101A10233@BLRKECMSG13.ad.infosys.com (view raw or flat)
Thread:
Lists: pgsql-performance
Dear All.

 

How to compute the frequency of predicate (e.g. Salary > $70000) in an
SQL query from a DB's pre-defined indexes?". I'm specifically looking at
how to retrieve information about indices (like number of pages at each
level of index, range of attribute values etc.)

 

Any suggestions regarding the same would be great

 

Thanks,

 

 

Avdhoot K. Saple
Junior Research Associate
High Performance & Grid Computing 
Infosys Technologies Ltd., Bangalore

 



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Next:From: Tom LaneDate: 2007-04-13 14:13:14
Subject: Re: local selectivity estimation - computing frequency of predicates
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