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Re: select count(*)

From: Roman Starek <starek_at_pluto.spsselib.hiedu.cz>
Date: 2000/07/28
Message-ID: <8lrcsg$j8g$2@crax.cesnet.cz>#1/1 






: I have a table of 10 million rows with 20 columns



select count (*) is usally done through full table scan.
Forcing some suitable index is possible to do this
operation through fast full scan of index. Indexes
are usually smaller in size so counting will be
faster. See dba_segments view sizes of objects.




        Starous
Received on Fri Jul 28 2000 - 00:00:00 CDT












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