- Category: Computer
- Author: Grant Fritchey
- Pages: 344 psges
- File type: PDF (332 pages, 15.29 MB)
Read and download free eBook intituled SQL Server Execution Plans, Second Edition in format PDF (332 pages, 15.29 MB) – 344 psges created by Grant Fritchey.
This book is the only in-depth look at how to improve your SQL query performance through careful design of execution plans
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? execution plans.
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
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