September 2010
Intermediate to advanced
1704 pages
111h 8m
English
book
Microsoft® SQL Server 2008 R2 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2008 R2 Unleashed
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Parallel Query Processing
The query processor in SQL Server 2008 includes parallel query processing—an execution strategy that can improve the performance of complex queries on computers with more than one processor.
SQL Server inserts exchange operators into each parallel query to build and manage the query execution plan. The exchange operator is responsible for providing process management, data redistribution, and flow control. The exchange operators are displayed in the query plans as the Distribute Streams, Repartition Streams, and Gather Streams logical operators. One or more of these operators can appear in the execution plan output of a query plan for a parallel query.
Whereas a parallel query execution plan can use more than one thread, ...
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