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SQL Optimizer for SAP ASE 3.9.1 - User Guide

Introduction Tutorials Preferences Editor Functions SQL Information and Functions Performance Monitor SQL Inspector SQL Collector for Monitor Server SQL Scanner Index Advisor SQL Optimizer
SQL Optimizer Overview Optimization Engine Common Coding Errors in SQL Statements What Function Should l Use to Retrieve the Run Time? Unsatisfactory Performance Results SQL Optimizer Functions SQL Editor Optimized SQL Activity Log
SQL Worksheet SQL Formatter Database Explorer Code Finder Object Extractor SQL Repository Index Impact Analyzer Index Usage Analyzer Configuration Analyzer Migration Analyzer Abstract Plan Manager User-Defined Temp Tables SQL History Legal Information

Batch Show Plan

The index candidates are either generated with the Advise Index function or manually created by the User-Defined Index function. To evaluate the impact of the index candidates on the SQL statement, the query plan is needed. You can obtain the query plans for all the index candidates by using the Batch Show Plan.

Click image\B_BatchShowPlan.gif.

Note: The indexes are physically created on the database, the query plan is retrieved, and then the indexes are dropped. This process may affect other SQL statements executing on the database during this period.

 

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Create Indexes

Once the index candidates have been reviewed, you can create an index on the database.

To create an index

  1. In the bottom right pane of the Index Advisor window, select the Index Set you want to create.

  2. Select Index | Create Index(es).

  3. The Create Indexes window displays with the CREATE INDEX statement for the selected Index Set. Click Create.

 

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Analyze Impact of New Indexes

Analyzing the impact of new indexes on other SQL statements before permanently creating them on your database is essential. While improving the performance of one SQL statement, new indexes may degrade the performance of others.

First, generate or create the Index candidates for your original SQL statement in the Index Advisor window and determined which Index Set(s) give you the most performance for your SQL statement. Before performing the Index Impact Analysis function, you must save the SQL statements that may be impacted by the creation of new indexes in the SQL Repository or SQL Scanner.

To analyze the impact of creating the new indexes

  1. In the Index Advisor window, select the bottom-left pane of the Index Set tab for the indexes that you want to analyze.

  2. Click image\B_ImpactAnalysis.gif.  

 

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Clear All Index Alternatives

You can clear all the Index Sets that have been generated in the Index Advisor window.

To clear all the Index Sets

Click image\B_ClearAllIndexSets.gif.

 

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