NOLU0—Do Not Optimize LU0 Data Streams of Command

Use the NOLU0 command to prevent the Optimizer from optimizing data streams for LU0 sessions. The command format is subsysid NOLU0 | LU0. subsysid is the name of the ULTRAOPT subsystem that was established when the product was installed.

This command is valid for ULTRAOPT/CICS and ULTRAOPT/IMS; however, it is often not required for ULTRAOPT/IMS. ULTRAOPT/IMS already suppresses optimization for the LU0 sessions that were established with the FMPROF=04 and TSPROF=04 session characteristics (“SLUP” sessions).

By default, ULTRAOPT/CICS optimizes eligible SLUP sessions and other eligible LU0 sessions as long as NOLU0 is not in effect. The LU0 command returns to the default setting.