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SQL Optimizer for SAP ASE 3.8 - User Guide

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Batch Run

Determine Best Performing Index Alternative

Index Advisor > Batch Run > Determine Best Performing Index Alternative

After you generated Index candidates or created Index Sets for your original SQL statement in the Index Advisor window, you need to determine which indexes give you the best performance. The Batch Run function is used to retrieve the run time of the original SQL statement for different index candidates or set.

To setup and execute the Batch Run

  1. Click image\B_BatchRun.gif.

  2. The Create Indexes for Batch Run window displays. Select the segment where the index will be created and specify the number for the consumers. Click OK.

  3. In the Batch Run Criteria window, select the Batch Run criteria from the following tabs and click OK. 

The Batch Run dialog field displays the run time criteria and the current run time of the SQL statement for each Index Set as it is retrieved.

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.

To terminate the running of the SQL statement under the current Index set

Select SQL | Stop Current.

To terminate the Batch Run process

Click image\B_AbortBatchRun.gif.


Related Topic

Create Indexes for Batch Run

Index Advisor > Batch Run > Create Indexes for Batch Run

The Create Indexes for Batch Run window displays when you execute the Batch Run or Batch Show Plan function. It enables you to specify how you would like the indexes created:




Select the segment where you would like the index created from the drop-down list.


(Default 1 Range 1-20)

Specify the number of consumer processes that should perform the sort operation for creating the index. The actual number of consumer processes used to sort the index may be smaller than the specified number, if fewer worker processes are available when Adaptive Server executes the sort.


Related Topic

Selected Index Set

Index Advisor > Batch Run > Selected Index Set

The Select Index Set tab of the Batch Run Criteria window is used to select or deselect which Index Sets are applied before retrieving the run time for the original SQL statement. All Index Sets are selected by default. By clicking a row, an Index Set can be selected or deselected. The selected Index Sets are prefixed with a Blue Checkmark image\I_BlueCheckmark.gif.

Note: The higher the Estimated I/O value does not necessarily mean lower performance. If possible, it is recommended that all alternatives be tested.

To select or unselect all the index sets

Right click and select Unselect All or Select All.

The Used Index can be de-selected only if the Used Index checkbox is not selected on the SQL Termination and Batch Termination tab and the Always run Used Index first option in the Selected Index tab is not selected.

To change the order the Index Sets are tested

  1. Click the row.

  2. Click Move Upimage\B_MoveUp.gif or Move Downimage\B_MoveDown.gif.

To change the order of the Index Sets by sorting

The Index Sets are ranked by Est. I/O Cost by default, with the exception for the Used Index which is placed at the top. You can sort either the Est. I/O column or the Index Set column by clicking the column heading.

To always run the Used Index first

Select the Always run Used Index first checkbox.

Note: This checkbox is dimmed if Used Index is selected as the SQL Termination or Batch Termination criteria.

To select or unselect a group of Index Sets according to the Est. I/O Cost values

  1. Select the Apply Filtering checkbox.

  2. Click SQL Selection Filterimage\B_SQLSelectionFilter.gif.

Note: The Est. I/O Cost is only available if you have already obtained the query plans.


Related Topic

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