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  SQL Server Tips by Robin Schumacher

The SQL Optimization Toolbox

To troubleshoot and optimize SQL and stored procedures, software is needed that helps the DBA quickly diagnose a particular query, understand what the optimizer is doing, get basic performance and execution statistics, and easily test different rewrite combinations. Software exists that does more than this, but most optimization pro’s get the majority of their work accomplished with these basic features.

Fortunately, everything described above can be found in Microsoft’s Query Analyzer tool, which has been bundled into SQL Server 2005’s Management Studio. Although many SQL Server professionals use Query Analyzer to run queries, some do not exploit the various built in functions of the tool.

Although looking at EXPLAIN plans is important, the ability to see the performance execution metrics at the start of, and during optimization sessions is the most valuable aid in troubleshooting. The trace capability is especially useful when tuning procedures as the lines of code can be pinpointed that are consuming the most I/O, CPU, etc. Query Analyzer makes it easy to trace and obtain all statistics necessary when tuning a piece of SQL code.

Most SQL Server folks rarely use the trace or execution statistics capability of Query Analyzer. These are powerful tools and should be utilized during a tuning session. Figure 10.1 is a representation of the results of using the SQL trace capability in Query Analyzer to view Procedure Execution Statistics.

The above book excerpt is from:

High-Performance SQL Server DBA
Tuning & Optimization Secrets

ISBN: 0-9761573-6-5
Robin Schumacher  


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