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Practice 4: Use the DTA.
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The practice tests on this book s companion CD offer many options. For example, you can test yourself on just one exam objective, or you can test yourself on all the 70-444 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
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Analyzing Queries
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You can often make database applications and stored procedures run faster on the same hardware by optimizing queries. Even ad hoc queries, run once to elicit specific information, can run faster if they follow the rules of query optimization. You can use such tools as SQL Server Profiler, the Database Engine Tuning Advisor (DTA), and dynamic management views (DMVs) to analyze a query and detect inefficiencies in query logic. You can add and optimize indexes very often the key to efficient query performance. You can troubleshoot concurrency issues for example, locks, blocks, deadlocks, and latches. However, often the best procedure is to display the queries in the Query Editor screen of SQL Server Management Studio (SSMS). With experience, you can gain insight into whether a query or procedure is efficiently constructed or badly formed. Hopefully, you can also educate your users in the basics of query construction.
Exam objectives in this chapter:
Troubleshoot and maintain query performance.
Identify poorly performing queries. Analyze a query plan to detect inefficiencies in query logic. Maintain and optimize indexes. Enforce appropriate stored procedure logging and output.
Troubleshoot concurrency issues.
Lessons in this chapter:
Lesson 1: Identifying Poorly Performing Queries . . . . . . . . . . . . . . . . . . . . . . . . 83 Lesson 2: Analyzing a Query Plan to Detect Inefficiencies in Query Logic . . . 98 Lesson 3: Maintaining and Optimizing Indexes . . . . . . . . . . . . . . . . . . . . . . . . 112 Lesson 4: Enforcing Appropriate Stored Procedure Logging and Output . . . 132 Lesson 5: Troubleshooting Concurrency Issues . . . . . . . . . . . . . . . . . . . . . . . . 137
2
Analyzing Queries
Before You Begin
To complete the lessons in this chapter, you must have completed the following tasks:
Configured a Microsoft Windows Server 2003 R2 computer with Microsoft SQL Server 2005 Enterprise Edition SP1 as detailed in the Appendix. Installed an updated copy of the AdventureWorks sample database as detailed in the Appendix.
No additional configuration is required for this chapter.
Real World
Ian Mclean Often the analysis of queries is not particularly demanding. For example, I once did some work for a professional society with a large number of members worldwide, which frequently carried out searches based on the first few (typically three) letters of a member s surname. The Surname column stored data in mixed case by using case-sensitive collation. So that all members were located, the query used the UPPER function for example:
SELECT Surname FROM Members WHERE UPPER(Surname) LIKE 'MAC%'
Every time such a query ran against the Members database, every record had the UPPER function applied to the Surname column. The queries were notoriously slow. The query needed to perform a case-insensitive search, and the collation could not be changed. My first step was to add a column to the database table:
ALTER TABLE Employees ADD UCSurname AS UPPER(Surname)
I could then create an index on the new column. As a result, the query could take the following form:
SELECT Surname FROM Members WHERE UCSurname LIKE 'MAC%'
Because an uppercase conversion was no longer required on every row every time such a query ran, time savings were significant.
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