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
Content preview from Microsoft® SQL Server 2012 Unleashed
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Query Plan Caching
SQL Server 2012 has a pool of memory used to store both execution plans and data. The amount of memory allocated to execution plans or data changes dynamically, depending on the needs of the system. The portion of memory used to store execution plans is often referred to as the plan cache.
The first time a cacheable query is submitted to SQL Server, the query plan is compiled and put into the plan cache. Query plans are read-only re-entrant structures shared by multiple users. At most, there are two instances of a query plan at any time in the plan cache: a serial execution plan and parallel query execution plan. The same parallel execution plan is used for all parallel executions, regardless of the degree of parallelism. ...