SQL Server Execution Plans

Fritchey, Grant

ISBN 10: 190643493X ISBN 13: 9781906434939

Editore: Red Gate Books, 2012

Lingua: Inglese

Condizione: Usato - Discreto Brossura

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Titolo

SQL Server Execution Plans

Editore

Red Gate Books

Data di pubblicazione

2012

Lingua

Inglese

ISBN 10

190643493X

ISBN 13

9781906434939

Rilegatura

Paperback

Condizione

Fair

Condizione della sovraccoperta

No Jacket

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Descrizione articolo

Riassunto

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. My book 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.

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Book by Fritchey Grant

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