You cannot create resource definitions until you have created the resource definition groups. When you create a group, a file is created for each type of table. You do not need to supply resource definitions for each table. In particular, the SIT and GLT might not contain entries.
What is a resource definition group?
A resource definition group defines a set of related resources. All table entries must be in a group. For example, resources may be grouped by application set or by business department. Other groups may include a set of common resources such as system definitions. This provides a way of selectively including resource definitions at control region startup. Predefined groups are provided for CICS-supplied transactions.
When a group is created, all resource definition tables, including a SIT and GLT, are created for that group. However, you do not have to provide entries for all tables. In particular, you may not want a SIT or GLT for all groups.
It is possible to assign a resource to more than one group. This means that different sets of resources can be specified for different situations. Thus resources with the same entry name but different group name may have differing data associated with them.
Using the resource definition CL commands
There are five CL commands used to create and maintain CICS groups:
Specifying which groups are used
The SITLIB and SITGRP parameters of the STRCICS (start a CICS/400 control region) command used to specify the SIT to be used for the control region. The GLTLIB and GLTGRP parameters of the SIT specifies which GLT is to be used to load resource definitions. The INSLIB and INSGRP parameters of the Group list Table (GLT) entries define which resource groups are to be installed, and in which order, for that control region. The groups are installed in the order in which the GLT entries were created.If there are duplicate definitions, the entries in the later groups overwrite those already installed. If any of the groups named in the GLT include a GLT or SIT, these are ignored. Only the SIT named in the STRCICS command and the GLT named in that SIT are used in the control region.
The group containing the GLT may include other resource definition tables. If this is the case, the GLT group name must be included as an entry in the GLT. Otherwise the resource definitions will not be installed when the control region is started.
For example, the command:
STRCICS CTLRGN(TEST) SITLIB(JOHN) SITGRP(ALAN)
will start control region TEST using the SIT in group ALAN in library JOHN. The SIT contains the parameters GLTGRP(FRED) and GLTLIB(JOHN). CICS/400 uses the SIT in group ALAN to start up the control region and the GLT in group FRED to load resource definitions. The GLT contains the following group definitions:
ADDCICSGLT LIB(JOHN) GROUP(FRED) INSLIB(JOHN) INSGRP(ALAN)
ADDCICSGLT LIB(JOHN) GROUP(FRED) INSLIB(JOHN) INSGRP(FRED)
When control region TEST starts, the GLT specified in the SIT, namely that in group FRED in library JOHN, is used to determine which resource definitions are installed. Groups ALAN and FRED are installed, with group ALAN being installed first. Any definitions in group FRED that duplicate those in group ALAN overwrite those installed from group ALAN. If the GLT entry for group FRED had been omitted from the GLT, no resources in that group would have been installed, but the GLT in group FRED would still have been used to control which resources were installed.
Use theRecoveroption of theWork with CICS Grouppanel. The action taken depends upon two parameters of the CRTCICSGRP command:
Note:This does not recover the records in the OS/400 members; it only makes sure that all the OS/400 members for the specified group exist.
Attention:Be careful how and when you use the CLRGROUP parameter. This parameter deletes all definitions in all table types for this group.
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