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Quest SQL Optimizer for IBM® DB2® LUWmaximizes SQL performance by automating the manual, time-intensive and uncertain process of ensuring that SQL statements are performing as fast as possible. SQL Optimizer analyzes, rewrites, and evaluates SQL statements within multiple database objects, files, or SQL statements captured by the DB2 Event Monitor. With SQL Optimizer, you can analyze and optimize all your problem SQL from multiple sources. SQL Optimizer also provides you a complete index optimization and plan change analysis solution, from index recommendations to simulated index impact analysis, through comparison of multiple SQL access plans.
SQL Optimizer provides you with the following main modules.
SQL Optimizer (including SQL Rewrite and Generate Indexes functions)
View the Index Impact Analyzer Window
The Index Impact Analyzer window displays the information about the SQL statements that are saved in the Index Impact Analyzer. The display in the right section of the window depends on what is selected in the left pane.
Always displays a tree diagram of the Analyzers and the folders they are stored in.
The right pane displays a variety of different information depending upon what is selected from the tree diagram in the left pane.
You can display information for the following:
In the Index Impact Analyzer window, when an Analyzer is selected in the left pane.
The Properties displays the following information:
General information about the analysis
Connection information used to retrieve the access plans and the SQL statements used in the analysis
Connection information used to retrieve the Baseline access plans
Indexes used for each Scenario
SQL Information for each SQL statement used in the analysis
In the Index Impact Analyzer pane, the following information is displayed in the right pane.
Provides a summary of the DB2 LUW Cost and SQL classification for the SQL statements before and after the proposed indexes were created.
Displays a bar chart which compares the accumulative total of the DB2 LUW Cost for the Baseline to each of the Scenarios. The Baseline shows the accumulative total of the DB2 LUW Cost of the SQL statements without the proposed indexes. The other bars show the accumulative total of the DB2 LUW Cost with the each proposed index set.