Arjun Sivadasan (3/3/2013)
Jeff Moden (3/3/2013)<snip/> For example, 40,000 INDEX SEEKs behind the scenes can be quite a bit slower than a single scan at the leaf level.
Jeff, in this case, won't optimizer choose to scan rather than to seek? Will optimizer seek blindly because the index is covering? Or does it depend?
It'll depend. The execution plan will compile according to assumptions based on statistics. If they're wrong... well, bad things happen.
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