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Improving Database Application Performance
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Lesson 2: Resolving Performance Problems
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Estimated lesson time: 60 minutes
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Even if your application was carefully designed and meticulously developed and deployed, it is still prone to performance problems. Performance problems can arise from a change in the operational environment, the addition of data, or improper use of indexes. You need to know what tools can be used to analyze application performance and be able to make recommendations on how to improve the application.
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There are several tools that can be used to troubleshoot poorly performing applications. In addition to the commonly used tools such as SQL Server Profiler and Windows System Monitor, SQL Server 2005 provides dynamic management views (DMVs) that expose statistical data through relational row sets. This section will review these tools and reveal how they can be used to diagnose commonly encountered problems.
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Using SQL Server Profiler
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SQL Server Profiler is a tool that allows you to capture detailed information about an event occurring in a SQL Server database. An event represents an action such as logging in to the server and executing a query or a stored procedure. Each event is associated with a class such as Audit Login and Audit Logout. These event classes are used to audit server activity, and they are two of the default events selected when you start a new trace. A trace is like a recording in which you first define what events and columns should be monitored. From the point a trace is started, data will be collected and stored in either a table or a file. The data collected from a trace can be analyzed to reveal information about how the SQL Server database is performing. Typically, a trace will be associated with a goal, such as looking for long-running queries.
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Lesson 2: Resolving Performance Problems
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You can execute SQL Server Profiler in one of two ways. From SQL Server Management Studio, select SQL Server Profiler from the Tools menu. Alternatively, you can go to Start, All Programs, SQL Server 2005, Performance Tools, and SQL Server Profiler. Either way, you will encounter a blank window with a menu bar. Templates provide a way to pre-load a trace with the events and columns associated with a particular goal. A default template is provided, along with several others. (See Table 8-3.) You can use the templates provided with SQL Server or create your own, saving them to a file with a .tdf file extension.
Table 8-3
Templates Included with SQL Server Profiler
Goal Monitor general database activity Event Category/Event Class Security Audit/Audit Login Security Audit/Audit Logout Sessions/Existing Connection Stored Procedures/RPC:Completed TSQL/SQL:BatchStarting TSQL/SQL:BatchCompleted
Template Name Standard (default)
SP_Counts TSQL
Capture stored procedure informa- Stored Procedures/SP:Starting tion over a period of time Debug client-based applications Security Audit/Audit Login Security Audit/Audit Logout Sessions/Existing Connection Stored Procedures/RPC:Completed TSQL/SQL:BatchStarting Stored Procedures/RPC:Completed TSQL/SQL:BatchCompleted
TSQL_Duration TSQL_Grouped
Identify long-running queries
Investigate queries from a particular Security Audit/Audit Login user Security Audit/Audit Logout Sessions/Existing Connection Stored Procedures/RPC:Starting TSQL/SQL:BatchStarting
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Improving Database Application Performance
Table 8-3
Templates Included with SQL Server Profiler
Goal Perform benchmark testing Event Category/Event Class Cursors/CursorClose Cursors/CursorExecute Cursors/CursorOpen Cursors/CursorPrepare Cursors/CursorUnprepare Security Audit/Audit Login Security Audit/Audit Logout Sessions/Existing Connection Stored Procedures/RPC Output Parameter Stored Procedures/RPC:Completed Stored Procedures/RPC:Starting TSQL/Exec Prepared SQL TSQL/Prepare SQL TSQL/SQL:BatchCompleted TSQL/SQL:BatchStarting
Template Name TSQL_Replay
TSQL_SPs
Confirm that procedures are being Security Audit/Audit Login recompiled Security Audit/Audit Logout Sessions/ExistingConnection Stored Procedures/RPC:Starting Stored Procedures/SP:Completed Stored Procedures/SP:Starting Stored Procedures/StmtStarting TSQL/SQL:BatchStarting Create a workload that is used by the Database Tuning Engine Advisor tool. Stored Procedures/RPC:Completed Stored Procedures/SP:StmtCompleted TSQL/SQL:BatchCompleted
Tuning
To start a new trace, select New Trace from the File menu. You will first be prompted to connect to the SQL Server. You can connect to either the Database Engine or Analysis Services. Once connected, you will need to select properties for your trace, such as the trace name, template, and optional start and stop times. You will also specify whether the trace is saved to a file or a table. (See Figure 8-6.)
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