IBM SC34-7012-01 CICS cold start, Starting CICS with the START=COLD parameter, About this task

Chapter 4. CICS cold start

This section describes the CICS startup processing specific to a cold start.

It covers the two forms of cold start:

v“Starting CICS with the START=COLD parameter”

v“Starting CICS with the START=INITIAL parameter” on page 50

Starting CICS with the START=COLD parameter

START=COLD performs a dual type of startup, performing a cold start for all local resources while preserving recovery information that relates to remote systems or resource managers connected through the resource manager interface (RMI).

About this task

This ensures the integrity of the CICS region with its partners in a network that manages a distributed workload. You can use a cold start to install resource definitions from the CSD (and from macro control tables). It is normally safe to cold start a CICS region that does not own any local resources (such as a terminal-owning region that performs only transaction routing). For more information about performing a cold start, and when it is safe to do so, see the CICS Intercommunication Guide.

If you specify START=COLD, CICS either discards or preserves information in the system log and global catalog data set, as follows:

vCICS deletes all cataloged resource definitions in the CICS catalogs and installs definitions either from the CSD or from macro control tables. CICS writes a record of each definition in the global catalog data set as each resource definition is installed.

vAny program LIBRARY definitions that had been dynamically defined will be lost. Only the static DFHRPL concatenation will remain, together with any LIBRARY definitions in the grouplist specified at startup or installed via BAS at startup.

vCICS preserves the recovery manager control record, which contains the CICS logname token used in the previous run. CICS also preserves the log stream name of the system log.

vCICS discards any information from the system log that relates to local resources, and resets the system log to begin writing at the start of the primary log stream.

Note: If CICS detects that there were shunted units of work at the previous shutdown (that is, it had issued message DFHRM0203) CICS issues a warning message, DFHRM0154, to let you know that local recovery data has been lost, and initialization continues. The only way to avoid this loss of data from the system log is not to perform a cold start after CICS has issued DFHRM0203.

If the cold start is being performed following a shutdown that issued message DFHRM0204, CICS issues message DFHRM0156 to confirm that the cold start has not caused any loss of local recovery data.

vCICS releases all retained locks:

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