CLEAR PROGRAM
Clears from memory all program files that aren't currently executing and aren't currently open with SET PROCEDURE or SET LIBRARY.
Syntax
CLEAR PROGRAM
Description
Program files are loaded into memory when they are executed with DO, and when they are loaded as library or procedure files with SET LIBRARY and SET PROCEDURE. When dBASE Plus is done with the program—the execution is complete, or the file is unloaded—the program file is not automatically cleared from memory. This allows these files to be quickly reloaded without having to reread them from disk. dBASE Plus' internal dynamic memory management will clear these files if it needs more memory; for example, when you create a very large array.
You may use CLEAR PROGRAM to force the clearing of all inactive program (object code) files from memory. The command doesn't clear files that are currently executing or files that are currently open with SET PROCEDURE or SET LIBRARY. However, if you close a file (for example, with CLOSE PROCEDURE), a subsequent CLEAR PROGRAM clears the closed file from memory.
CLEAR PROGRAM is rarely used in a deployed application. Because of the event-driven nature of dBASE Plus, program files must remain open to handle events; these files are not affected by CLEAR PROGRAM anyway. Also, the amount of memory used by dormant program files is small compared to the total amount of memory available. You are more likely to use CLEAR PROGRAM during development, for example to ensure that you are running the latest version of a program file, and not one that is stuck in memory.