SQL Optimizer for DB2 LUW 4.3.1 - User Guide

Right Pane for Analyzers

In the Index Usage Analyzer window, when an Analyzer is selected in the left pane, the following information is displayed in the right pane.

Index Usage Chart (Top right pane)

Displays the total number of indexes in the tables used in all the selected SQL statements and the number of used and unused indexes. Charts the percentage of the indexes that are used by the access plans for the selected SQL statements.

Analysis Information (Bottom right pane)

The detailed information about the Analysis is displayed in the button pages. The buttons for displaying specific information are found at the top of this pane.

Properties button

Displays general information about the analysis, information on the connection used to retrieve the access plans and the SQL statements used in the analysis.

Index Summary button

Displays the indexes that are used by the selected SQL statements in black text and highlights in red the indexes that are not used.

To save a list of all the unused indexes

1. Right-click and select Save.

2. In the Save Format window, select Text, HTML, or Excel Convertible (Spreadsheet).

To drop an index

Right-click the line with the index you want to drop and select Drop Index.

Right Pane for Tables Analyzed

In the Index Usage Analyzer window, when the Tables Analyzed is selected in the left pane, the following information is displayed in the right pane.

Summary button

Provides a summary of the use of indexes for each table. It gives the total number of SQL that use the table and if the SQL statement accesses the table with a full table scan or uses an index to access the table.

Chart button

Charts the number of SQL statements that use the table.

Right Pane for Analyzed Table Information

In the Index Usage Analyzer window, when a table is selected under the Tables Analyzed section is selected in the left pane, the following information is displayed in the right pane.

Prognosis Button

Unused Index Button

Lists the indexes and the key for all indexes in the table that are not used.

To save a list of all the unused indexes

1. Right-click and select Save.

2. In the Save Format window, select Text, HTML, or Excel Convertible (Spreadsheet).

To drop an index

Right-click the line with the index you want to drop and select Drop Index.

Table Information Button

Right Pane for SQL Analyzed Folder

In the Index Usage Analyzer window, when the SQL Analyzed folder is selected in the left pane, the following information is displayed in the right pane.

Index Used

Displays all the SQL statements and shows the tables and indexes used.