You would normally specify the system initialization parameters that CICS® is to use in the following ways, before
starting CICS:
- In the system initialization table, loaded from a library in the STEPLIB
concatenation of the CICS startup procedure
- In the PARM parameter of the EXEC PGM=DFHSIP statement of the CICS startup
procedure
- In the SYSIN data set defined in the startup procedure (but only if SYSIN
is coded in the PARM parameter)
The system initialization parameters are processed in the preceding order, with later system initialization parameter values
overriding those specified earlier.
In particular, you can specify a new value for the START system initialization parameter, which can
have any of the following values:
- START=AUTO
- If you specify the START=AUTO system initialization parameter, CICS determines whether to perform
an initial, cold, warm, or emergency start by inspecting two records in the
global catalog:
- The recovery manager control record
- The recovery manager autostart override record.
START=AUTO should be the normal mode of operation, with the choice
of start being made by CICS automatically.
- START=INITIAL
- The new run of CICS has no reference to any previous run. The global
catalog and system log are initialized, and all information in them is lost.
- START=COLD
- The new run of CICS has limited reference to the previous run, and uses
the same global catalog and system log. In particular, resynchronization information
needed by remote systems to resynchronize their units of work is preserved.
- START=STANDBY
- CICS starts up as an XRF alternate CICS region, by initializing only
to the point at which it can monitor the active CICS region. Depending on
how the active CICS region was shut down, the alternate CICS region completes
either a warm or emergency restart, if it needs to take over, as follows:
- If the active CICS region was shut down via a successfully completed CEMT
PERFORM SHUTDOWN TAKEOVER command, the alternate CICS region performs a warm start.
- If the active CICS region was shut down abnormally, the alternate CICS
region performs an emergency restart.
Note:
You must also specify the XRF=YES system initialization parameter.
For example, if your CICS startup procedure specifies:
//INITCICS EXEC PGM=DFHSIP,REGION=®,
// PARM=('SYSIDNT=HTH1,SIT=6$,SYSIN,CN')
//*
//SYSIN DD DISP=SHR,DSN=&libpfx..CICSH###.SYSIN(CICS&CLONE)
CICS uses system initialization parameters from the following sources, with later system initialization parameters overriding
earlier ones:
- The system initialization table, DFHSIT6$, from the STEPLIB concatenation
- The member CICSH### of the CICSTS31.CICS.CICSH###.SYSIN
data set
- The system console.
The START system initialization parameter
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