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 creating a non-clustered index
It is now clear that indexes improve performance for most of the SELECT statements, if it is created wisely on a proper key field. There is one limitation on clustered indexes—only one clustered index is allowed per table, and in many cases, it may not be possible to cover all the required columns in one clustered index. There is another object provided by SQL Server, known as non-clustered index, which could be used on one or more than one column.
If you cover one highly selective column in the clustered index, it is not certain that you are going to use that column only, in all the WHERE and JOIN statements, especially when a table has many columns. In this scenario, we have to create ...
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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.