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Using Transact-SQL to Manage Databases in Visual Studio .NET
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Review
To further practice and reinforce the skills you learned in this chapter, you can
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test. Summary
To achieve maximum performance for your database queries, you should perform periodic index maintenance to keep index fragmentation in your databases to a minimum level. Index and column statistics are key to query performance. Because the query optimizer uses them to determine the execution plan of the query, you need to make sure that statistics are up to date. Another important database maintenance task is shrinking databases and database files that contain unneeded and unused space to a smaller size to recapture the unused disk space. You need to periodically check the integrity of your databases by using the DBCC CHECKDB command and handle errors found during its execution by restoring the database from a valid backup. 12 Review
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book. external fragmentation histogram index fragmentation index rebuild index reorganization internal fragmentation page split statistics string summary Case Scenarios
In the following case scenarios, you apply what you ve learned about how to maintain SQL Server 2005 by using Transact SQL. You can find answers to these questions in the Answers section at the end of this book. Case Scenario 1: Defragmenting an Index
You are a DBA for a local book publisher. As part of your job, you must design a method to manage index fragmentation levels. You have decided to create a SQL Server Agent job that checks index fragmentation levels and issues the appropriate ALTER INDEX statement to defragment fragmented indexes. To achieve this goal, you need to answer the following questions: 1. What mechanism will your job use to check index fragmentation levels 2. What threshold will the job use to determine whether the indexes have external fragmentation 3. What threshold will the job use to determine whether your indexes have internal fragmentation 12 Review
Case Scenario 2: Maintaining Database Integrity
You are a DBA for a large phone company. You need to design a database integrity check job in SQL Server Agent. During a planning meeting, your manager asks you the following questions about your integrity job: 1. In large databases, what options will you use with the DBCC CHECKDB statement to minimize any performance impact of running the statement 2. What other options will you use when you run the DBCC CHECKDB statement against all databases 3. How can you make sure that if the integrity-check job finds an issue, you can correct the problem and ensure the database s integrity
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