If checkpoint-restart
mode is enabled and a batch program terminates without completing,
the program can be rerun beginning with the DATA step or PROC step
that was executing when it terminated. DATA or PROC steps that completed
before the batch program terminated are not reexecuted. If a DATA
step or a PROC step must be reexecuted, you can add the CHECKPOINT
EXECUTE_ALWAYS statement before the step. Using the CHECKPOINT EXECUTE_ALWAYS
statement ensures that SAS always executes the step without regard
to the checkpoint-restart data.