Re: Composite indices and skip scanning

From: Jocke Treugut <treugut_tuning_at_yahoo.se>
Date: Thu, 15 Apr 2004 15:27:23 +0200 (CEST)
Message-ID: <20040415132723.53642.qmail@web21003.mail.yahoo.com>

Hi, Chris!

CBO will only choose a INDEX SKIP SCAN if that access path has a lower cost than other alternatives.

CBO calcluates the cost for a ISS to be:

BLEVEL + #of distinct values of skipped column(s).

Cheers / Jocke Treugut

www.treugut-tuning.com

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Received on Thu Apr 15 2004 - 08:25:00 CDT