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Old 10-06-2016, 07:36 AM   #1
beingchinmay
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Join Date: Jun 2015
Posts: 246
Arrow What is a covered index ?

A covered index can satisfy a query just by its index keys without having the need to touch any data pages. When an Index covers the query in this way it is a called covering index.It means that when a query is fired,SQL Server doesn’t need to go to the table to retrieve the rows, but can produce the results directly from the index as the index overs all the columns used in query.







Asthi jivak
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