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MORE INFO
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Language coverage
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For the sake of brevity, we cover the core programming structures of SQL Server by using TransactSQL code instead of common language runtime (CLR) code. For more information about implementing triggers, functions, and stored procedures by using the CLR, see the following SQL Server 2005 Books Online articles CLR Stored Procedures, CLR Triggers, and CLR User-Defined Functions. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/ 2005/downloads/books.mspx.
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Exam objectives in this chapter:
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Implement functions. Create a function. Identify deterministic versus nondeterministic functions.
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Implement stored procedures. Create a stored procedure. Recompile a stored procedure. Assign permissions to a role for a stored procedure.
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9
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Creating Functions, Stored Procedures, and Triggers
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Implement triggers. Create a trigger. Create DDL triggers for responding to database structure changes. Identify recursive triggers. Identify nested triggers.
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Lessons in this chapter:
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Lesson 1: Implementing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352 Lesson 2: Implementing Stored Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 Lesson 3: Implementing Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
Before You Begin
To complete the lessons in this chapter, you must have
SQL Server 2005 installed. A copy of the AdventureWorks sample database installed in the instance.
Real World
Michael Hotek A customer of mine was having some major performance issues with its applications. After discussing the issues the company was encountering, we started digging around in the database. There were a lot of tables, very few indexes, and not a single stored procedure. Although stored procedures don t necessarily mean better performance, the lack of procedures meant that any performance tuning would be extremely invasive within the application. Using SQL Server Profiler (which 15, Monitoring and Troubleshooting SQL Server Performance, discusses), we captured all the queries being issued against the database in a 30-minute window to get a snapshot of what was going on. The results were staggering. An application that only 15 users were working in had generated more than 300,000 queries in just 30 minutes. Something was clearly wrong. So we connected to a test system for further investigation and found some interesting behavior. A user would click a button that would return four rows of data and execute more than 1,500 queries.
Before You Begin
It turns out that the developers used a development environment that does everything for you and never paid attention to what was going on in the database. But, of course, the performance problem was SQL Server s fault. Although everyone wanted to blame SQL Server, executing more than 1,500 queries to retrieve 4 rows of data was clearly the application s fault. After figuring out what the users really needed, we wrote a stored procedure to return the results. We went back to the test system and clicked the button; almost instantly, the results popped up in the application. However, instead of listening and waiting until the solution was complete, the customer shoved the new code directly into production, where it promptly blew up. Why To point the application at the stored procedure, it was necessary to rewrite a section of the application code and recompile it. The new code was never tested, and no one noticed that the developer had inadvertently disabled a critical piece of functionality. Over the next four months, we systematically ripped apart every section of the application and replaced the ad hoc SQL code with stored procedures. In the end, the process required rewriting the entire application and going through full functional testing, load testing, and user-acceptance testing. When we finally deployed the application, it had only slightly better performance than before because we hadn t had the time to optimize everything. But over the next week, we were able to systematically tune each of the stored procedures and deploy them directly into production without having to touch a single line of application code. The moral of the story is that even if stored procedures do not directly improve performance, if you use them, any subsequent tuning does not require developers to rip apart their applications, retest, and run the risk of breaking something that is currently working.
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