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Costs in explain plan

From: Arn Klammer <Arn.Klammer_at_austrac.gov.au>
Date: Tue, 11 Dec 2001 22:55:33 -0800
Message-ID: <F001.003DA893.20011211224518@fatcity.com>

Hi,

Can you compare the costs that are displayed in explain plan output? For example, I have a query that contains a merge join. The cost reported in the explain plan is 134. By including a hint to use a nested loop instead, the cost becomes 1160. Does this mean the merge join plan is more efficient, despite generally being considered a less efficient join method than a NL?

Thanx

-a



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Author: Arn Klammer
  INET: Arn.Klammer_at_austrac.gov.au
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