SET OPTIMIZE Command

  • Article

Enables or disables Rushmore optimization.

SET OPTIMIZE ON | OFF

Parameters

  • ON
    (Default) Enables Rushmore optimization.
  • OFF
    Disables Rushmore optimization.

Remarks

Visual FoxPro uses a technology called Rushmore to optimize data retrieval. Table commands that support a FOR clause use Rushmore technology to enhance their performance. When you issue a command that is optimizable, Rushmore determines which records match the FOR criterion. The command is executed on records in the table that match the Rushmore record set.

In rare cases, you should disable Rushmore optimization. If a command that benefits from Rushmore optimization modifies a query's index keys, the Rushmore record set may become outdated. You can disable Rushmore optimization to ensure that you have the most current information from the table.

You can use SET OPTIMIZE to globally enable or disable Rushmore technology. Every command that uses Rushmore has a NOOPTIMIZE clause you can include to disable Rushmore optimization for the command.

For more information, see Using Rushmore to Speed Data Access.

Below are the commands whose performance is optimized by Rushmore:

Commands  
AVERAGE INDEX
BLANK LABEL
BROWSE LIST
CALCULATE LOCATE
CHANGE RECALL
COPY TO REPLACE
COPY TO ARRAY REPLACE FROM ARRAY
COUNT REPORT
DELETE SCAN
DISPLAY SORT
EDIT SUM
EXPORT TOTAL

See Also

INDEX | SET ORDER | Using Rushmore to Speed Data Access