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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Reading Query Plans
To better understand what the query processor is doing, we need a way to look at query plans. SQL Server 2005 has several different ways of displaying a query plan, and we refer to all these techniques collectively as “the showplan options.”
Query Plan Options
SQL Server 2005 supports three showplan options: graphical, text, and XML. Graphical and text were available in prior versions of SQL Server; XML is new to SQL Server 2005. Each showplan option outputs the same query plan. The difference between these options is how the information is formatted, the level of detail included, how we read it, and how we can use it.
Graphical Plans
The graphical showplan option uses visually appealing icons that correspond to the iterators ...
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