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 is provided in the CICS IMS™ Database Control Guide.
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.
By an alternate CICS when it performs takeover under the following conditions:
The active and alternate CICS systems are in different MVS images, perhaps
in different processors.
The active CICS was connected to, or trying to connect to, a DBCTL subsystem.
(This does not include disconnecting from one DBCTL and reconnecting to another.)
The takeover was not initiated by the XXDFB exit, or the takeover was
initiated by XXDFB but the active system reestablished a DBCTL connection before
takeover occurred and XXDTO was driven for a new DBCTL takeover decision.
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.