June 2015
Intermediate to advanced
1800 pages
70h 6m
English
book
Microsoft SQL Server 2014 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft SQL Server 2014 Unleashed
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Join Selection
The job of the Query Optimizer is incredibly complex. The Query Optimizer can consider literally thousands of options when determining the optimal execution plan. The statistics are simply one of the tools that the Query Optimizer can use to help in the decision-making process.
In addition to examining the statistics to estimate cardinality and determine the most efficient access paths for the SARGs and join conditions, the Query Optimizer must consider the optimum order in which to access the tables, the appropriate join algorithms to use, the appropriate sorting algorithms, and many other details too numerous to list here. The goal of the Query Optimizer during join selection is to determine the most efficient join strategy. ...
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