This is part of the larger task of customizing your z/OS® environment.
IBM® Integration Bus for z/OS uses Resource Recovery Service (RRS) to coordinate changes to WebSphere® MQ and DB2® resources. Ensure it is configured and active on your system, because your integration node cannot connect to DB2 unless RRS is active.
Refer to the following manuals for detailed information about RRS: z/OS V1R5.0 MVS™ Setting Up a Sysplex and z/OS V1R5.0 MVS Programming: Resource Recovery SA22-7616.