DCMT DISPLAY Commands › DCMT DISPLAY DATA SHARING Command › DCMT DISPLAY DATA SHARING Command Usage

DCMT DISPLAY DATA SHARING Command Usage

Display for DCMT DISPLAY DATA SHARING SUMMARY

The following information is displayed for the SUMMARY option:

• The name of this system's data sharing group and the name of this system's default cache.
• The following information about the list of the members of the group:
  • Their member name
  • Their member state as assigned by XCF
  • Their prior and current user states as assigned by CA IDMS
  • The number of recovery locks held on proxies and resources (records and areas) on behalf of the member if it requires recovery
• The following information about the list structure associated with this system's data sharing group:
  • Its name
  • The name of the Coupling Facility in which it is allocated
  • Its connection identifier and version
  • The structure size and the maximum count of elements and entries
• The following information about the lock structure associated with this system's data sharing group:
  • Its name
  • The name of the Coupling Facility in which this system's lock structure was allocated
  • This system's lock structure connection identifier
  • This system's lock structure connection version
  • Its size
  • The maximum number of CA IDMS systems that can be members of the group
  • The number of lock entries in the structure
  • The maximum number of record data entries that can be contained in the lock structure
  • The number of times the lock structure has run short on record data entries
  • The number of record data entries currently allocated
  • The number allocated by this system
  • The highest number of record data entries allocated at one time
  • The number of record data entries that are held by this member and that are freeable because they are held on behalf of unused proxies

Display for DCMT DISPLAY DATA SHARING XES LIST

The following information is displayed for the XES LIST option:

• The summary information about the list structure as described above for the SUMMARY option
• The following information about the set of statistics associated with each list in the list structure:
  • Its name or list identifier. AreaList maintains information about shared areas. FileList maintains information about files associated with shared areas. QueueList maintains information about shared queues
  • The number of reads issued for entries in the list
  • The number of writes issued for entries in the list
  • The number of deletes issued for entries in the list
  • The number of conflicts detected when updating a list entry
  • The number of other errors detected when accessing the list

Display for DCMT DISPLAY DATA SHARING XES LOCK

The following information is displayed for the XES LOCK option:

• The summary information about the lock structure as described above for the SUMMARY option
• The following information about the set of statistics for each type of global resource controlled through the lock structure:
  • The resource type. LmgrResource represents a record or area. Phys.Page represents a database page. GlobalDeadLk represents a resource used to single thread assignment of a global deadlock detector. LmgrProxy represents a proxy. EnqDeq represents an enqueued resource. AreaList represents a resource used to single thread update of the coupling facility area list. FileList represents a resource used to single thread update of the coupling facility file list. GlobalQueue represents a shared queue.
  • The number of lock acquisition requests (obtains) that were issued by this system
  • The number of obtains not serviced immediately
  • The number of times an obtain failed because a wait was required and a wait was not allowed
  • The number of times an obtain was denied by the CA IDMS contention exit
  • The number of times other exception conditions were encountered on an obtain request
  • The number of times a request was issued to alter the state of a global lock held by this system
  • The number of times an alter could not be serviced immediately
  • The number of lock release requests issued by this system
  • The number of times a lock release could not be serviced immediately
  • The number of times an exception condition was encountered on an alter or release request
  • The number of times the CA IDMS contention exit was invoked to resolve conflicts for the resource type
  • The number of times the CA IDMS notify exit was invoked as part of conflict resolution

Display for DCMT DISPLAY DATA SHARING XCF GROUP

The following information is displayed for the XCF GROUP option:

• The name of this system's data sharing group and the name of this system's default cache.
• The following information about the list of the members of the group:
  • Their member name
  • Their member state as assigned by XCF
  • Their prior and current user states as assigned by CA IDMS
  • The number of recovery locks held on proxies and resources (records and areas) on behalf of this member if it requires recovery
• The following information about the set of statistics for each member by message type:
  • The type of message. Reply represents replies issued by this system to messages sent by the indicated member. SyncStamp messages inform members of changes in SQL table definitions. GlobalDeadLock messages are used to resolve global deadlocks. DCMTDCUFSEND messages are used to broadcast commands. AreaFileVal messages inform members of changes in area and file status. QueueMsg messages inform members of the creation of a new global queue. ProgramMsg messages inform members whenever a #DELETE ... NEW COPY is issued.
  • The number of messages sent to the member from this system
  • The number of errors encountered when sending a message to the member
  • The number of messages received from the member by this system
  • The number of messages sent to this system by the member that were purged because no task was registered to receive that type of message
  • The number of errors encountered in attempting to receive a message from the member

More Information

• For more information about the meaning of these parameters, see the CA IDMS System Operations Guide.
• For more information about data sharing, see the CA IDMS System Operations Guide.