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Every day, out in the various online forums devoted to SQL Server, and on Twitter, the same types of questions come up repeatedly: Why is this query running slowly? Why is SQL Server ignoring my index? Why does this query run quickly sometimes and slowly at others?
My response is the same in each case: have you looked at the execution plan? An execution plan describes what’s going on behind the scenes when SQL Server executes a query. It shows how the query optimizer joined the data from the various tables defined in the query, which indexes it used, if any, how it performed any aggregations or sorting, and much more. It also estimates the cost of all of these operations, in terms of the relative load placed on the system. Every Database Administrator, developer, report writer, and anyone else who writes T-SQL to access SQL Server data, must understand how to read and interpret execution plans.
SQL Server Execution Plans leads you right from the basics of capturing plans, through how to interrupt them in their various forms, graphical or XML, and then how to use the information you find there to diagnose the most common causes of poor query performance, and so optimize your SQL queries, and improve your indexing strategy.
ASIN : B00CXWRFQA
Publisher : Red Gate Books
Accessibility : Learn more
Publication date : May 21, 2013
Edition : 2nd
Language : English
File size : 17.4 MB
Screen Reader : Supported
Enhanced typesetting : Enabled
X-Ray : Not Enabled
Word Wise : Not Enabled
Print length : 417 pages
Page Flip : Enabled
Best Sellers Rank: #1,163,178 in Kindle Store (See Top 100 in Kindle Store) #660 in Computer Databases #3,385 in Databases & Big Data
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