Most resource definitions can be installed in groups or individually,
and are committed at the individual resource level. However, some VTAM® terminal
control resource definitions must be installed in groups and are committed
in installable sets.
Some VTAM terminal
control resource definitions within a CSD group are committed at the installable
set level. An installable set comprises those resources, such as a CONNECTION
and its associated SESSIONS, which are dependent in some way. The backout
of an installable set does not cause the whole group to be backed out. The
following types of resource definition are installed in installable sets:
- CONNECTION and associated SESSIONS definitions
- Pipeline terminals—all the terminal definitions sharing the same POOL
name
If a member of an installable group fails to install, CICS issues message
DFHZC6216 identifying the member that caused the installation of the set to
fail.
All other resource types are committed individually, and not in installable
sets. For these resources, the effect of a partially successful group INSTALL
is to leave the resources that were added in a committed state.
For the installation of installable sets and for individual definition,
an INSTALL may not be successful for one of two reasons:
- A resource definition could not be installed because it is currently in
use.
- A system failure occurred during installation.
You can use the CEDA INSTALL command to reinstall the same group used at
a cold or initial start, and the new definitions are installed successfully,
even if some original definitions are in use and fail to install.