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SQL Optimizer for SQL Server 10.1.2 - User Guide

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Get Execution Plans

SQL Optimizer automatically retrieves the execution plan when you optimize or execute a SQL statement. The Execution Plan window contains an Estimated Plan tab and an Actual Plan tab.

Note: When you generate virtual index alternatives, the execution plan is not retrieved for the SQL statement because SQL Optimizer does not physically create indexes on the database. See Fill Missing Estimated Plans for more information.

Estimated Plan

The Estimated Plan is generated by the SHOWPLAN command.

To get an estimated plan

  1. Enter a SQL statement in the Alternative Details pane.
  2. Do one of the following:

  • Click .
  • Select the Estimated Plan tab and click Get Estimated Plan.

Actual Plan

The Actual Plan is retrieved after executing SQL and includes real statistics such as Actual Rows, Actual Rebinds and Actual Rewinds that are not in an estimated plan.

To get an actual plan

» To retrieve an Actual Plan, do one of the following:
  • Execute the selected SQL statement.

  • For the selected statement, select the Actual Plan tab and click Test Run - Current.

Tips for both Estimated and Actual Plans:

  • To select which columns to display in the execution plan, right-click the plan and select Plan Options. The settings will apply to the current module only
  • To change the font style and color, as well as the highlighting color, for the execution plans in all modules, select Options | General | Execution Plan See. Execution Plan Options for more information.
  • Use the Plan toolbar (right side of pane in tree view) to select from several options that display different plan details (operators, predicates, statistics).

Note: The Actual Plan tab displays and additional button at the top of the Plan toolbar. Click the Plan Comparison button to display a comparison of estimates and actual statistics.

Execution Plan Actions

Right-click in the Execution Plan window to select from the following actions:

Action Description
Copy Copies the execution plan to the clipboard.
Save Saves the execution plan as a JPG file.
Print Opens the print window so you can print the execution plan.
Style
Select option to display different plan details (operators, predicates, statistics).
View Plan Allows you to change how the execution plan is displayed.
Step Description Select this option to display a description of the step selected in the execution plan.
Plan Information If you select this option, SQL Optimizer identifies whether an execution plan uses any of the following: cardinality feedback, dynamic sampling, SQL plan directives, or adaptive plan. If applicable, the information displays in the Execution Plan pane directly above the Execution Plan tab.
Animate Plan Steps Highlights, one-by-one, the execution plan steps.
View Missing Indexes Create a user-defined alternative.
Generate Indexes Explore different index alternatives.
Plan Options Opens the Execution Plan Options window so you can select which information is displayed in the execution plan and whether to display specific items in a column.
Help on SELECT Displays definition of SELECT operator.
Help on Execution Plan Opens online help for the Execution Plan window.

  

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