IBM SC34-7012-01 manual Distributed transaction resources, Dump table, Installable set install

Installable set install

The following VTAM terminal control resources are committed in installable sets:

vConnections and their associated sessions

vPipeline terminals—all the terminal definitions sharing the same POOL name

If one definition in an installable set fails, the set fails. However, each installable set is treated independently within its CSD group. If an installable set fails as CICS installs the CSD group, it is removed from the set of successful installs. Logical sets that are not successfully installed do not have catalog records written and are not recovered.

If the install of a resource or of an installable set is successful, CICS writes the resource definitions to the global catalog during commit processing.

Distributed transaction resources

Unlike all other resources in a cold start, CICS preserves any information (units of work) about distributed transactions.

This has no effect on units of work that relate only to the local CICS - it applies only to distributed units of work. The CICS recovery manager deals with these preserved units of work when resynchronization with the partner system takes place, just as in a warm or emergency restart.

This is effective only if both the system log stream and the global catalog from the previous run of CICS are available at restart.

See the CICS Transaction Server for z/OS Installation Guide for information about recovery of distributed units of work.

Dump table

The dump table that you use for controlling system and transaction dumps is not preserved in a cold start.

If you have built up over a period of time a number of entries in a dump table, which is recorded in the CICS catalog, you have to re-create these entries following a cold start.

Starting CICS with the START=INITIAL parameter

If you specify START=INITIAL, CICS performs an initial start as if you are starting a new region for the first time.

About this task

This initial start of a CICS region is different from a CICS region that initializes with a START=COLD parameter, as follows:

vThe state of the global catalog is ignored. It can contain either data from a previous run of CICS, or it can be newly initialized. Any previous data is purged.

vThe state of the system log is ignored. It can contain either data from a previous run of CICS, or it can reference new log streams. CICS does not keep any

50CICS TS for z/OS 4.1: Recovery and Restart Guide