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non-unique index enforcing pk

From: tq <tomm_quinn_at_yahoo.com>
Date: 8 Feb 2006 16:31:23 -0800
Message-ID: <1139445082.984680.282450@f14g2000cwb.googlegroups.com> 






Are there performance caveats on index access when enforcing a pk with
a non-unique index?



I see that a query that specifies a single pk value against such a
table gets an INDEX RANGE SCAN rather than an INDEX UNIQUE SCAN. But
I'm wondering if it is actually more expensive in this case..?
Received on Wed Feb 08 2006 - 18:31:23 CST












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