December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
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Estimating Access Path Cost
After the selectivity of each of the SARGs, OR clauses, and join clauses is determined, the next phase of optimization is estimating the access path cost of the query. The Query Optimizer attempts to identify the total cost of various access paths to the data and determine which path results in the lowest cost to return the matching rows for an expression.
The primary cost of an access path, especially for single-table queries, is the number of logical I/Os required to retrieve the data. Using the available statistics and the information stored in SQL Server regarding the average number of rows per page and the number of pages in the table, the Query Optimizer estimates the number of logical page reads necessary to ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.