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SQL Optimizer for DB2 LUW 4.3.1 - Installation Guide

Send SQL to Index Expert

Use this procedure to send the SQL statement selected in the current tool to a SQL Optimizer session, where the Generate Indexes function automatically runs on the statement. The Generate Indexes function creates virtual index sets that you can test on the SQL statement to determine whether the SQL's performance improves.

See Generate Index-Set Alternatives for more information about the Generate Indexes function.

To execute Generate Indexes on an SQL statement in another module

  1. Select the SQL statement you want to optimize.

  2. Click image\B_CopyToIndexExpert.gif.

    The selected SQL statement is copied to the SQL Optimizer window, where the Generate Indexes function automatically starts.

When copying a SQL statement from the Scanned SQL Viewer,

  • If the SQL statement uses temporary tables and the DDL for creating the table was found when scanning, you are prompted to create the temporary tables through the User-Defined Temp Table window.

  • If the DB2 LUW Special Registers are different from current settings, then you are prompted to set the special registers through the Special Register Settings window.

  • If your current schema does not match the one previously used to retrieve the access plan of the SQL statement, a message alerts you to change the schema from the box at the left-corner of the main window.


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