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Lost locks recovery complete
A quiesce interface function initiated by VSAM. VSAM takes action
associated with a sphere having completed lost locks recovery on all CICS
regions that were sharing the data set.
SMSVSAM invokes the CICS RLS quiesce exit program in each region that
is registered with an SMSVSAM control ACB.
Until lost locks recovery is complete, CICS disallows any new requests to
the data set (that is, only requests issued as part of the recovery processing
are possible). When lost locks recovery is complete, CICS allows all
requests to the data set.
Quiesce coupling facility cache available
A quiesce interface function initiated by VSAM. VSAM takes action
associated with an MVS coupling facility cache structure being restored.
SMSVSAM invokes the CICS RLS quiesce exit program in each region that
is registered with an SMSVSAM control ACB.
CICS retries any backout-failed shunted units of work for all data sets.
Switching from RLS to non-RLS access mode
The main reason why you might need to switch a data set from RLS access mode
to non-RLS access mode is to run a batch update program that cannot be changed
to run as a CICS transaction.
About this task
Non-RLS access mode is a generic term embracing NSR, LSR, and GSR access
modes. It is likely that your existing batch programs open VSAM data sets in NSR
access mode, although it is also possible for batch programs to use LSR or GSR.
As a general rule, you are recommended not to switch between RLS and non-RLS
within CICS. After a data set is accessed in RLS mode by CICS, it should always
be accessed in RLS mode by CICS. The following topic describes an exception to
this general rule for read-only operations.
Exception for read-only operations
There is an exception to the general rule about not switching between RLS and
non-RLS within CICS.
You can switch to non-RLS access on a data set that is normally opened in RLS
mode provided access is restricted to read-only operations. You might want to do this,
for example, to allow continued access for read-only transactions while the data set
is being updated by a batch job. CICS and VSAM permit quiesced data sets to be
opened in non-RLS mode, but you must ensure that CICS transactions do not
update a data set that is being updated concurrently by a batch program.
The recommended procedure for providing CICS read access to a recoverable data
set while it is being updated by a batch job is:
v Resolve retained locks.
v Quiesce the data sets.
v Redefine the files as non-RLS and read-only mode in all relevant CICS regions.
You can do this using the CEMT, or EXEC CICS, SET FILE command.
172 CICS TS for z/OS 4.1: Recovery and Restart Guide