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By mswatcher
via blogs.msdn.com
Submitted: Sep 14 2013 / 14:13

Well-constructed indexes can greatly improve read performance in SQL server, but they can be costly to maintain. There’s the obvious cost of additional time for your periodic index maintenance (rebuilds, reorganization and updating statistics) and the cost of additional storage, but there’s also a cost every time you make an update to indexed data. 
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