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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Using arithmetic operator wisely in predicate to improve performance
Arithmetic operation directly on the column name in the WHERE condition makes your condition non-sargable and index defined on the column will not get performance benefits. As long as possible, try to avoid this situation by logical workarounds to gain performance boosts.
Getting ready
There is no automatic way to find this behavior; this is simply a manual process. You either keep this step in mind while developing the SQL script or while working on performance tuning projects.
Let us use two tables from the AdventureWorks2012 database to demonstrate this exercise.
[AdventureWorks2012].[HumanResources].[Employee][AdventureWorks2012].[HumanResources].[EmployeePayHistory]
How to do ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.