Zone and data set sharing considerations

The following identifies the phases of ZONEMERGE processing and the zones and data sets that 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:
    1. Either the target zone or the distribution zone is accessed, according to the zone type specified in the previous SET command.
    2. Both the “from” and “to” zones are accessed at this time.
  2. ZONEMERGE processing
    Target zone
    Read with shared enqueue.
    Target zone
    Update with exclusive enqueue.
    DLIB zone
    Read with shared enqueue.
    DLIB zone
    Update with exclusive enqueue.
    Note:
    1. Either the target zone or the distribution zone is accessed, according to the zone type specified in the previous SET command.
    2. The “from” zone is accessed for read with shared enqueue; the “to” zone is accessed for update with exclusive enqueue.
  3. Termination

    All resources are freed.