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SQL Optimizer for DB2 LUW 5.0 - User Guide

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SQL Optimizer for IBM® DB2® LUW

UsageStatistics Getting Started

User Logon Screen Connect to the Database User Logon Privileges Special Registers Settings Synchronize the Data Dictionary Enter Authorization Key Select Database Language Status Bar—Main Window Toolbar

About Options SQL Rewrite Settings

SQL Rewrite Settings Intelligence SQL Rewrite (1) SQL Rewrite (2) SQL Options Quota General

Editor Settings Activity Log Settings Plan Settings SQL Scanner Settings

SQL Scanner Settings Options General

SQL Classification Settings

SQL Classification Settings SQL Statement with no Access Plan

Directory Setup Linkage Settings General Settings

General Settings General Message Result Set

Generate Indexes Settings

Generate Indexes Settings Intelligence Index Options General

SQL Scanner Concepts

About SQL Scanner Embedded and Dynamic SQL Statements What does the SQL Scanner scan? Scanned SQL Statement Classification Data Directory Setting SQL Scanner Conversions

About SQL Scanner Conversions Trigger Conversion Parameter Marker Conversion Local Variable Conversion Quoted String Conversion COBOL Conversion

About Job Manager Job Manager Window Group Manager Window Open the SQL Scanner Add Scanner Jobs

Add Jobs to the Job Manager Window Add Database Objects Add Source Code Add SQL Inspectors Summary

Scan Scan Source Code with Temporary Tables Abort Scan Find a Job View Group Summary View Group Properties View Job Properties Open Group Manager Check Scanned SQL Mark and Unmark Jobs Delete Marked Jobs Move or Copy Jobs to Another Group Modify Job Details Switch Schema Placing Bookmarks in the Job Manager Window Create Benchmark Factory Import File Job Manager Functions

Scanned SQL Viewer

About Scanned SQL Viewer Scanned SQL Viewer Window Understand the Access Plan Open Scanned SQL Viewer View a Particular Type of SQL Statement Job Navigation Generate Report for Scanned SQL Statements Create Benchmark Factory Import File Scanned SQL Viewer Functions

SQL Optimizer Concepts

About the SQL Rewrite Function What Function Should l Use to Retrieve the Run Time? Unsatisfactory Performance Results SQL Functions SQL Optimizer Functions

SQL Optimizer Window

SQL Optimizer Window SQL Page

SQL Page SQL Text Pane SQL Information Pane Run Time Pane

Access Plan Page

Access Plan Page Access Plan Table Statistics Pane Index Statistics Pane Column Statistics Pane Column Values Distribution Statistics Pane Update Statistics

Plan Statistics Page Summary Page Compare Page Execute Result Page

Use the SQL Optimizer

Enter the Original SQL Statement Automatically Rewrite the Original SQL Statement Rewrite Details Add User-Defined SQL Alternatives Add Virtual Index Alternatives

About the Generate Indexes Function Index Expert Database Requirements Generate Index-Set Alternatives Index Generation Details Add Your Own Virtual Index Sets Analyze the Impact of New Indexes

Generate a Report for Optimized SQL Verify the Correctness of Rewritten SQL Test for Scalability Create Benchmark Factory Import File Batch Run

Retrieve the Run Time for a Group of Alternatives Input Parameter Values Time Commit or Rollback How to select the Optimal SQL Statement? View Batch Run Details Batch Run Criteria Window

Selected SQL SQL Termination Batch Termination Run Time Mode/ Repeat Test Batch Run Schedule

Save Optimized SQL

Save Optimized SQL Open Optimized SQL View Open Optimized SQL Details Refresh Plan Details Window

About SQL Formatter SQL Formatter Window Format a SQL Statement Host Variables within SQL Formatter SQL Formatter Functions

SQL Inspector Overview Data Directory Setting Open SQL Inspector SQL Inspector Window Statistics: Executed SQL Statistics: Executing SQL Add Inspector

Add Inspector General Information Collection Period Collection Time SQL Filter Monitoring Period Target Time Target Applications and Users

Inspect Ad hoc Inspect Abort Inspect Scan Inspector Delete Inspector Find Inspector View Inspector Properties Place Bookmarks in SQL Inspector Window Create Benchmark Factory Import File Sum Statistics for a Stored Procedure SQL Inspector Functions

Database Explorer

About Database Explorer Database Explorer Window Privileges Opening Database Explorer Sort Criteria Modify Data Copy Column Names to Another Window Copy Data from Cells, Rows, or Columns View LONG, CLOB and BLOB Columns Scan Database Objects Database Explorer Functions

About SQL Repository SQL Repository Window Add SQL to SQL Repository Add SQL Window: General Page Add SQL Window: SQL Information Page Refresh SQL Access Plan Modify SQL Rename SQL Delete SQL Create Benchmark Factory Import File SQL Repository Functions

Index Impact Analyzer

About Index Impact Analyzer Index Impact Analyzer Window

Index Impact Analyzer Window Right Pane for Analyzers Right Pane for Scenarios Analyzed Folder Right Pane for Scenario Right Pane for SQL Analyzed Folder Right Pane for SQL Statements

Create an Index Impact Analyzer New Analysis Wizard: Analyzer Page New Analysis Wizard: Select SQL Page New Analysis Wizard: Index Page Add Index Window View Index Impact Analysis Details Add SQL to an Index Impact Analysis Add Scenario Modify Index Impact Analyzer Regenerate Rename an Index Impact Analyzer Delete an Index Impact Analysis Index Impact Analyzer Functions

Index Usage Analyzer

About Index Usage Analyzer Index Usage Analyzer Window

Index Usage Analyzer Window Right Pane for Analyzers Right Pane for Tables Analyzed Right Pane for Analyzed Table Information Right Pane for SQL Analyzed Folder Right Pane for SQL Statements

Create an Index Usage Analysis Update an Index Usage Analysis New Analysis Wizard: Analyzer Page New Analysis Wizard: Select SQL Page View Index Usage Analysis Details Modify an Index Usage Analysis Rename an Index Usage Analysis Delete an Index Unused Analysis Index Usage Analyzer Functions

User-Defined Temp Table

About User-Defined Temp Table Privileges for Creating User-Defined Temp Tables Create Temporary Tables View SQL Scripts of Temporary Tables Drop Temporary Tables Copy SQL with Temporary Tables to SQL Optimizer Preference Settings for Handling Temporary Tables

Editor Functions

About Editor Functions Auto Correction Brackets Pairing Comment and Uncomment Text Customize Editable Panes Editor Panes Shortcuts Indent and Outdent Text Member and Argument Lookup Syntax Highlight Uppercase and Lowercase Text

About SQL Functions Retrieve Access Plan Retrieve Run Result Retrieve Run Time Test for Scalability Convert Parameter Markers

SQL Information and Functions

SQL Information Pane Send SQL to SQL Optimizer Send SQL to Index Expert Open SQL from SQL Repository Save SQL to SQL Repository Create Benchmark Factory Import File SQL Navigation Find a SQL Using a Text String Comments Variables Parameters Window Filter Database Objects Access Plan

Access Plan Review Access Plans Access Plan Options Access Plan Functions Plan Detail Plan Help Animate Access Plans Copy Access Plans DB2 Optimized Text

Search Functions

Search Functions Find Quick Find Find Next Replace Goto Line Regular Expression

About Activity Log View Activity Log Report Purge Activity Log Data Start Recording Activities Stop Recording Activities

SQL Scanner Tutorial SQL Optimizer Tutorial SQL Formatter Tutorial SQL Inspector Tutorial User-Defined Temp Tables Tutorial SQL Repository Tutorial Save SQL to the SQL Repository from Other Modules Tutorial Generate Virtual Indexes Tutorial Index Impact Analyzer Tutorial Index Usage Analyzer Tutorial Database Explorer Tutorial

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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

Pane	Function	Description
Top	Summary Information	Displays a summary of the indexes in the table that are used or unused.
Middle	Index Used Information	Displays the indexes used by the SQL statement.
Bottom Left	SQL Text	Displays the text of the SQL statement.
Bottom Right	SQL Information	Displays the access plan, SQL Classification, and the temporary table DDL for the selected SQL statement in the SQL Information pane.

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

Right-click and select Save.
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

Tab	Description
Definition	Displays when and where the table was created.
Columns	Displays the column information for the table.
Index	Displays the index information for the table.
DDL	Displays the DDL for creating the table and indexes.

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.

Right Pane for SQL Statements

When a SQL statement is selected in the left pane, the following information is displayed in the right pane.

Properties button

Displays general information about the analysis, information on the connection used to retrieve the access plans and the database settings at the time of the analysis.

SQL Information button

Displays the access plan and the SQL Information pane.

Index Used button

Lists the table name, indexes and the key for all indexes used in the SQL statement.

To save a list of all the used indexes

Right-click and select Save.
In the Save Format window, select Text, HTML, or Excel Convertible (Spreadsheet).

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