z/OS MVS Programming: Sysplex Services Guide
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Updating the Database - Requestor is the NO-BACKUP Member

z/OS MVS Programming: Sysplex Services Guide
SA23-1400-00

In this scenario, a user on system 3 wants to change a name in the database, causing the following events to occur:
  • Member 3 checks the user states in the table to determine which member is PRIMARY.
  • Member 3 determines that member 1 is the PRIMARY member.
  • Member 3 creates a work element, places the work element on its own work queue, and issues IXCMSGOX to send the work element to the PRIMARY member (member 1).
          IXCMSGOX  MEMTOKEN=MEM3TKN,MSGBUF=RECORD1,MSGLEN=LENMSG        X
             MSGCNTL=REQUPD,TARGET=MEM1TKN,RETCODE=RETURN,              X
             RSNCODE=REASON,MF=(E,MSGOLSTD)
  • The message user routine for member 1 gets control. The routine checks the message control information and determines that this is a request to update the database.
  • Member 1's message user routine creates a work element to prepare to receive the message.
  • Member 1's message user routine issues IXCMSGIX to read in the message.
          IXCMSGIX   MSGTOKEN=TOKENMSG,MSGBUF=(R3),RETCODE=RETURN,       X
                RSNCODE=REASON,MF=(E,MSGILSTD)
  • Member 1's message user routine places the work element on the DBMGR's work queue, and posts the DBMGR.
  • When the DBMGR is done with the work, it issues IXCMSGOX to the requesting member stating that the work is completed, deletes the request from DBMGR's work queue, and updates member 1's status field.
       IXCMSGOX   MEMTOKEN=MEM1TKN,MSGBUF=RECORD1,MSGLEN=LENMSG     X
             MSGCNTL=GOODRC,TARGET=MEM3TKN,RETCODE=RETURN,         X
             RSNCODE=REASON,MF=(E,MSGOLSTD)
  • When member 3's message user routine gets control, the routine determines that the message control information contains GOODRC, indicating a successful update.
  • Member 3 returns the results of the operation to the caller.
  • Member 3 deletes that request from its work queue, and updates member 3's status field.

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