Exit XXDFB

The XXDFB exit is invoked when a message is received from the active CICS indicating that the connection to DBCTL failed.

When invoked
By the alternate CICS® when it receives a message from the active CICS indicating that connection to DBCTL has failed. The alternate and active CICS systems are running in different MVS images, perhaps in different central processing complexes (CPCs). More information about these exits, see Overview of Database Control (DBCTL).
Exit-specific parameters
UEPDBXR
Address of CICS XRF information for use with DBCTL. The CICS XRF information can be mapped using the DSECT DFHDXUEP.
Return codes
UERCNOAC
Take no action.
UERCSWCH
Switch to the alternate DBCTL.
UERCABNO
Abend CICS without a dump.
UERCABDU
Abend CICS with a dump.
The return code ‘UERCNORM' is not available for use at this exit point.
XPI calls
The following must not be used:
  • INQUIRE_MONITORING_DATA
  • MONITOR
  • TRANSACTION_DUMP
  • WRITE_JOURNAL_DATA.