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Lesson 3: Designing Efficient Cursors
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Figure 3-4 Trace results for a trace performed while executing the spGetPriorProduct stored procedure.
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1. Which caching method is easy to implement but allows you the most control in how it is implemented 2. What new feature with SQL Server 2005 enables you to receive notifications when the data in your cache has been updated 3. What are some commonly used alternatives to using a server-side cursor 4. Which two statements should be executed after all the rows in your cursor are fetched 5. Which concurrency option should be avoided to minimize blocking Quick Check Answers 1. Control level-caching is easily implemented by adding the OutputCache directive to the top of the HTML. By using control level-caching as opposed to page levelcaching, you have more control over what is cached in your Web page. 2. Query notifications allow you to receive notifications when the data in your cache has been updated. You can then execute a refresh of the cache and ensure that you have the latest version of the data.
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Designing a Cursor and Caching Strategy
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3. Often, you can replace a cursor with a single SELECT statement. You can also consider using a WHILE loop, CASE function, and a recursive query. 4. You should always include the CLOSE and DEALLOCATE statements after all the data in your cursor has been fetched. This will release all locks and also remove the cursor from server memory. 5. The SCROLL_LOCKS option should be avoided, because it assumes updates might occur to the data before the cursor has been closed. Depending on the lock hints specified in the SELECT statement, locks might be issued on the underlying tables by using this option.
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Case Scenario: Evaluating Cursor Performance
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In the this case scenario, you are a database developer for a large financial company that provides mortgages to people with poor credit ratings. For the past three years, the company has been utilizing a complex ASP.NET application that retrieves data from a SQL 2000 database. As the amount of data in the database increased, company employees have noticed that the application response time has decreased. The company now intends to move the data to a SQL 2005 database. They would like for you to analyze the solution and recommend ways that the application can be improved. Upon reviewing the SQL code, you notice that a cursor is used in about half the stored procedures. What strategy might you recommend for improving database performance
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Objective 1.4: Design caching strategies
Practice 1 Using the AdventureWorks database, you will design a solution using query notifications. To do this, you will need to perform the following steps:
Create a Service Queue using Transact-SQL code in Query Analyzer. Create a Visual Studio application (Windows Forms or Web-based) that will create the notification and wait for changes. The application will need to create a notification using the SqlNotificationRequest object. It will also need to create a thread that waits for changes. When changes are registered, an e-mail should be sent directly to you. Manually alter the data in the target table using Query Analyzer. Ensure that the notification is triggered and the email is sent to your mailbox.
Lesson 3: Designing Efficient Cursors
Objective 1.3: Design a cursor strategy for a data access component Objective 2.3: Design a cursor strategy
Practice 1
Locate a production SQL Server in your organization (it can be one with an earlier version of SQL Server). Using Query Analyzer or SQL Server Management Studio, examine the stored procedures and user-defined functions and look for the use of cursors. If you locate any, see whether there is a way to rewrite the cursor using one of the alternatives suggested in this chapter.
References
ASP.NET Caching http://www.ondotnet.com/pub/a/dotnet/2002/12/30/cachingaspnet.html .NET Data Caching http://aspnet.4guysfromrolla.com/articles/100902-1.aspx ASP.NET Caching: Techniques and Best Practices http://msdn2.microsoft.com/en-us/library/aa478965.aspx Working with Query Notifications http://msdn2.microsoft.com/en-us/library/ms130764.aspx Performance Tuning SQL Server Database Cursors http://www.sql-server-performance.com/cursors.asp Application Development Trends The SQL Server 2005 Paradigm Shift http://www.adtmag.com/article.aspx id=11148& SQL Server Query Design: 10 Mistakes to Avoid http://searchsqlserver.techtarget.com/loginMembersOnly/1,289498,sid87_gci1229788,00 .html NextURL=http%3A//searchsqlserver.techtarget.com/tip/0%2C289483%2Csid87 _gci1229788%2C00.html
The Curse and Blessings of Dynamic SQL http://www.sommarskog.se/dynamic_sql.html How to Perform SQL Server Row-by-Row Operations Without Cursors http://www.sql-server-performance.com/dp_no_cursors.asp Using SQL Server Cursors http://www.mssqlcity.com/Articles/General/UseCursor.htm SQL Server Clinic: T-SQL Performance Problems and Solutions http://searchsqlserver.techtarget.com/tip/1,289483,sid87_gci1170220_tax301334,00 .html adg=301324&bucket=ETA track=sy41
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