Using the DB2 group attach facility
When you are defining the connection between CICS® and DB2®, you can choose to have CICS connect to a specific DB2 subsystem.
About this task
You can specify the name of this DB2 subsystem using the DB2ID attribute of the DB2CONN definition. However, if you have multiple DB2 subsystems that are using DB2 Version 7 or later, you might want to use DB2's group attach facility to make it possible for CICS to connect to any of your subsystems, rather than just one named subsystem.
Group attach is a DB2 facility that allows CICS to connect to any one member of a data-sharing group of DB2 subsystems, rather than to a specific DB2 subsystem. The group attach facility chooses any one member of the group that is active on the local MVS™ image for the connection to CICS (members that are active on other MVS images are not eligible for selection).
To use the group attach facility: