Replacing a discarded RECON data set

DBRC detects that a RECON data set is discarded only when some activity occurs that causes DBRC to access the RECON data sets. You can have multiple instances of DBRC whenever you have multiple IMS subsystems, online or batch. You cannot delete and redefine a discarded RECON data set until all instances of DBRC detect that a change has occurred and they deallocate the discarded data set.

DBRC lists the subsystems that are active at reconfiguration in message DSP0388I. This message enables you to identify the subsystems that might need your help in detecting the status change of the RECON data sets.

To redefine a RECON data set after an I/O error has occurred, or in conjunction with the CHANGE.RECON REPLACE command, follow this procedure:

Procedure

  1. Allow all batch jobs using DBRC to finish.
  2. Issue LIST.RECON STATUS in all online subsystems if you do not have Automatic Loss Notification active. Issuing the command causes the online subsystems to obtain the same Copy1 and Copy2 RECON data sets and to deallocate the discarded RECON data set. If you do have Automatic Loss Notification active, all subsystems are automatically notified to deallocate the discarded RECON data set. See RECON loss notification for more information on RECON Loss Notification.
  3. Use the AMS DELETE command to delete the discarded RECON data set.
  4. Use the AMS DEFINE command to recreate the RECON data set as an empty VSAM KSDS data set. Use the same procedure that you used originally to create the RECON data set. See Creating a RECON data set.