July 2012
Intermediate to advanced
478 pages
10h 3m
English
Content preview from Microsoft SQL Server 2012 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Increasing performance by covering index
Before discussing covering index further, it should be understood that a covering index is not a separate type of index that has a different internal structure and algorithm. It is just a technique that is used to boost up the performance of data retrieval for the table.
You may wonder If it is not a new type of index, why do we need to use it?
Run the same SELECT query that we ran earlier in the Increasing performance by creating non-clustered index section, which was creating the non-clustered index seek operation. But now, run this query with some more fields in the SELECT clause, may be like this:
--running the same query we ran earlier to see behavior after --Non-Clustered Index was created with just ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.