Creating a What-If scenario

To create a What-If scenario

1. In the Performance perspective, select the source statement from a Tuning session.You can use a baseline statement or one of the What-If scenarios that you have previously created.

   The SQL tab displays the details of the source SQL statement.

2. Click  to create a What-If scenario.
3. (Optional) On the SQL tab, edit the scenario if needed:
   1. Enter a unique name for the What-If scenario.
      If you do not give the scenario a new name, by default BMC AMI Command Center adds an incremental number as a suffix to the source statement name.
   2. Edit the following details of the scenario:

      • Db2 connection

        Tip

        Click to specify which Db2 connections to include in your list of favorite connections.

      • table qualifier
      • Explain type
      • degree.

   3. (BMC.DB2.SPE2210) Edit the SQL statement as needed:

      Purpose	Action
      Find a search string	Click Find/Replace . Enter the search string in the Search box. Click Find.
      Find and replace a search string	Click Find/Replace . Enter the search string in the Search box. Enter the replacement string in the Replace box. Click Find. Click Replace.
      Find and replace all instances of a search string	Click Find/Replace . Enter the search string in the Search box. Enter the replacement string in the Replace box. Click Replace All.
      Make a search case sensitive	Select the Match case check box.
      Enable syntax highlighting	Select the Use syntax highlighting for SQL statements Command Center option. For more information, see Setting-Command-Center-options.
      View SQL statement options	Click Show more.
      Hide SQL statement options	Click Show less.
      Undo an action	Click  to undo the last action.
      Redo an action	Click  to cancel undoing the last action.

4. (Optional) On the Indexes tab, modify the indexes.For more information, see Creating-and-editing-a-What-If-index-scenario.
5. When finished, click Generate explain plan .
6. (BMC.DB2.SPE2304) (Optional) To export the explain plan to a PDF file, perform the following steps:
   1. Click Generate Report .
      Based on your browser settings, after Command Center generates the report, either the Save As dialog box is displayed or the browser saves the file automatically.
   2. Enter a name for the file.
   3. Click Save.

Where to go from here

You can now compare this What-If scenario with another scenario or baseline statement.