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XFCNREC. If the base cluster block is set as unrecoverable and a mismatch has
been allowed, access may be allowed to the data set, via an unrecoverable file,
before the data set is fully recovered.
To provide a means of selecting which mismatches to accept and which to reject,
three parameters are passed to the exit. These are the address of the filename, the
address of the base data set name, and the address of a byte containing the file
backout indicator. Because the exit is driven only if there is a mismatch, the data
set backout indicator can be derived from the setting for the file.
Note: If XFCNREC is used to suppress an open failure due to a mismatch, the
global user exit XFCSREQC will pass the base data set backout setting as
the exit parameter UEFBCRV, and not the file backout setting, which may be
different.
Using XFCNREC with a BWO mismatch
Exit XFCNREC can allow the file to be opened and CICS will continue to run
normally. However, forward recovery will not be available for the opened dataset.
File control quiesce receive exit, XFCVSDS
The XFCVSDS exit is invoked when VSAM RLS notifies CICS that processing is
required as a result of some data set-related events occurring in the sysplex.
XFCVSDS is invoked before CICS processing takes place, and only if a data set
name block (DSNB) exists for the data set. The actions that cause XFCVSDS to be
invoked are:
v A data set is being quiesced throughout the sysplex.
CICS is informed about this action only if it has files open in RLS mode against
the data set.
If CICS is notified about a quiesce action, the XFCVSDS global user exit
program can cancel the data set quiesce, in which case it cancels the quiesce
throughout the sysplex, and the data set remains in the unquiesced state.
v A data set is being unquiesced throughout the sysplex.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about unquiesce actions.
v DFSMSdss wants to start a non-BWO backup of a data set.
CICS is notified about a non-BWO backup start action only if it has files open in
RLS mode against the data set.
If CICS is notified about a non-BWO backup start action, XFCVSDS can be used
to cancel the backup.
v DFSMS has completed a non-BWO backup of a data set.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about non-BWO backup complete actions.
v DFSMS wants to start a BWO backup of a data set.
CICS is notified about a BWO backup start action only if it has files open in RLS
mode against the data set.
If CICS is notified about a BWO backup start action, XFCVSDS can be used to
cancel the backup.
v DFSMS has completed a BWO backup of a data set.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about BWO backup complete actions.
122 Customization Guide