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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Optimizing a query using an object plan guide
Plan guide is a feature in SQL Server that you can use to tune queries, which are developed/deployed by third parties and for which you are not allowed to modify the code. With a plan guide, it's possible to attach query hints to the queries that are executed against the database server. A SQL Server attaches the query hints, as specified by the plan guide, to the query before executing it. In this way, an ad-hoc query or a query in the stored procedure can be tuned without changing it in the source code.
There are three types of plan guides, as follows:
- Object plan guide: Used with stored procedures and user-defined functions
- SQL plan guide: Used with ad-hoc SQL queries
- Template plan guide: Used with ...
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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.