September 2008
Beginner to intermediate
768 pages
17h 40m
English
book
Microsoft® SQL Server™ 2008 All-In-One Desk Reference For Dummies®
by Robert D. Schneider, Darril Gibson
Content preview from Microsoft® SQL Server™ 2008 All-In-One Desk Reference For Dummies®
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VII.3.3. Designing High-Velocity Queries
The previous sections of this chapter give you some recommendations on how to create a positive environment for high-performance databases, as well as some guidelines for implementing a responsive indexing infrastructure. This section looks at how you can speed up your interactions with your data and how to construct the most efficient queries possible. We also give you some tips on how to streamline your data-modifying interactions.
Figure VII.3-5. A collection of statistics, along with details.
VII.3.3.1. Understand query execution plans
The previous chapter is devoted to helping you come to grips with the SQL Server Query Optimizer and how to take advantage of its power. One suggestion we make is for you to learn how to interpret execution plans because SQL Server uses these reports to tell you exactly how it plans to process your query. Armed with this information, you can take steps to remedy any queries that don't quite measure up. For example, Figure 3-6 shows an execution plan for a moderately complex query.
In addition to providing all these helpful details about the upcoming execution plan, SQL Server also notifies you of any potential trouble spots.
VII.3.3.2. Avoid leading wildcards
As a database designer or application developer, you always strive to take advantage of indexes for queries against large tables. Otherwise, ...
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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.