The following identifies the phases of UCLIN processing and the zones and data sets SMP/E may require for exclusive or shared use during each phase. For more information about command phases and data set sharing in SMP/E, see Sharing SMP/E data sets.

1. Initialization

   Global zone

   Read without enqueue.

   Target zone

   Read without enqueue.

   DLIB zone

   Read without enqueue.

   Note: Either the global zone, target zone, or the distribution zone is accessed, based on the zone specified in the previous SET command.
2. UCLIN processing

   Global zone

   Update with exclusive enqueue.

   SMPPTS

   Update with exclusive enqueue.

   Target zone

   Update with exclusive enqueue.

   DLIB zone

   Update with exclusive enqueue.

   Note: Either the global zone and SMPPTS, the target zone, or the distribution is accessed, based on the zone specified in the previous SET command.
3. Termination

   All resources are freed.