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SQL Optimizer for DB2 LUW 4.4.1 - User Guide

SQL Optimizer for IBM® DB2® LUW
UsageStatistics 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 Functions

Below is a list of available functions within the Index Impact Analyzer window.

Button or Menu

Function

Analysis & Right-click Menu

image\B_NewAnalysis_IIA.gif

New Analysis/Abort Analysis

Right-click Menu

Add Folder

Right-click Menu

Add Scenario

Right-click Menu

Add SQL

Right-click Menu

Regenerate

Right-click Menu

Modify

Right-click Menu

Rename

Right-click Menu

Delete

 

Create Indexes

 

 

Index Usage Analyzer

Quest SQL Optimizer for IBM® DB2® LUW maximizes 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

 

About Index Usage Analyzer

The Index Usage Analyzer identifies unused indexes by analyzing access plans from SQL statements in your database applications. It examines their access plans and reports any indexes in the database that are not used. You can use this module to quickly identify the indexes in databases that are not contributing to the performance of the database applications. These unused indexes can then be deleted to free up space and improve the speed of the database applications and maintenance.

The Index Usage Analyzer identifies:

  • Tables that are referenced in the SQL statements

  • Indexes in each table that are used in the access plans, and the number of referenced SQL for each index

  • Indexes in each table that are not used in the access plans

The selected SQL statements that the Index Usage Analyzer analyzes are from SQL that you have saved in the SQL Repository or SQL statements from the SQL Scanner.

 

Related Topics

Index Usage Analyzer Window

Quest SQL Optimizer for IBM® DB2® LUW maximizes 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

 

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