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SQL Optimizer for DB2 LUW 4.3.1 - User Guide

SQL Optimizer for IBM® DB2® LUW
About SQL Optimizer for IBM DB2 LUW Getting Started Options SQL Scanner SQL Optimizer SQL Formatter SQL Inspector Database Explorer SQL Repository Index Impact Analyzer Index Usage Analyzer User-Defined Temp Table Editor Functions SQL Functions SQL Information and Functions Activity Log
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Index Impact Analyzer Window

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)

SQL Formatter

Database Explorer

SQL Scanner

SQL Inspector

SQL Repository

Index Impact Analyzer

Index Usage Analyzer

 

Index Impact Analyzer Window

ClosedView 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.

Left pane—Analyzer List

Always displays a tree diagram of the Analyzers and the folders they are stored in.

Right Pane

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:

Analyzers

Scenarios Analyzed Folder

Scenario

SQL Analyzed Folder

SQL Statements

 

Right Pane for Analyzers

In the Index Impact Analyzer window, when an Analyzer is selected in the left pane.

Properties Button

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

 

Right Pane for Scenarios Analyzed Folder

In the Index Impact Analyzer pane, the following information is displayed in the right pane.

Summary button

Provides a summary of the DB2 LUW Cost and SQL classification for the SQL statements before and after the proposed indexes were created.

Chart button

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.

 

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