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2. If the default shutdown assist transaction CESD is run, it allows as many tasks
as possible to commit or back out cleanly, but within a shorter time than that
allowed on a normal shutdown. See “The shutdown assist transaction” on page
30 for more information about CESD, which runs the CICS-supplied program
DFHCESD.
3. None of the programs listed in the shutdown PLT is executed.
4. CICS does not write a warm keypoint or a warm-start-possible indicator to the
global catalog.
5. CICS does not close files managed by file control. It is left to VSAM to close the
files when VSAM is notified by MVS that the address space is terminating. This
form of closing files means that a VSAM VERIFY is needed on the next open of
the files closed in this way, but this is done automatically.
6. VTAM sessions wait for the restarted region to initialize or until the expiry of
the interval specified in the PSDINT system initialization parameter, whichever
is earlier.
The next initialization of CICS must be an emergency restart, in order to preserve
data integrity. An emergency restart is ensured if the next initialization of CICS
specifies START=AUTO. This is because the recovery manager’s type-of-restart
indicator is set to “emergency-restart-needed” during initialization and is not reset
in the event of an immediate or uncontrolled shutdown. See “How the state of the
CICS region is reconstructed” on page 34.
Note: A PERFORM SHUTDOWN IMMEDIATE command can be issued, by the
operator or by the shutdown assist transaction, while a normal or immediate
shutdown is already in progress. If this happens, the shutdown assist transaction is
not restarted; the effect is to force an immediate shutdown with no shutdown
assist transaction.
If the original PERFORM SHUTDOWN request specified a normal shutdown, and
the restart manager (ARM) was active, CICS is restarted (because CICS will not
de-register from the automatic restart manager until the second quiesce stage of
shutdown has completed).
Shutdown requested by the operating system
This type of shutdown can be initiated by the operating system as a result of a
program check or an operating system abend.
A program check or system abend can cause either an individual transaction to
abend or CICS to terminate. (For further details, see “Processing operating system
abends and program checks” on page 94.)
A CICS termination caused by an operating system request:
v Does not guarantee that user tasks will complete.
v Does not allow shutdown PLT programs to execute.
v Does not write a warm keypoint or a warm-start-possible indicator to the global
catalog.
v Takes a system dump (unless system dumps are suppressed by the DUMP=NO
system initialization parameter).
v Does not close any open files. It is left to VSAM to close the files when VSAM is
notified by MVS that the address space is terminating. This form of closing files
means that a VSAM VERIFY is needed on the next open of the files closed in
this way, but this is done automatically.
Chapter 3. Shutdown and restart recovery 29