September 2007
Intermediate to advanced
448 pages
13h 52m
English
book
Inside Microsoft® SQL Server™ 2005: Query Tuning and Optimization
by Kalen Delaney, Sunil Agarwal, Craig Freedman, Ron Talmage, Adam Machanic
Content preview from Inside Microsoft® SQL Server™ 2005: Query Tuning and Optimization
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Caching Mechanisms
SQL Server can avoid compilations of previously executed queries by using four mechanisms to make plan caching accessible in a wide set of situations.
Adhoc query caching
Autoparameterization
Prepared queries, using either sp_executesql or the prepare and execute method invoked through your API
Stored procedures or other compiled objects (triggers, TVFs, etc.)
To determine which mechanism is being used for each plan in cache, we need to look at the values in the cacheobjtype and objtype columns in the sys.dm_exec_cached_plans view. The cacheobjtype column can have one of five possible values:
Compiled Plan
Parse Tree
Extended Proc
CLR Compiled Func
CLR Compiled Proc
In this section, the only value we’ll be looking at is Compiled ...
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