Any_MRCB
When a transient data I/O buffer has been acquired for a task, a VSAM string must be obtained. If all the VSAM strings available for transient data processing are in use, the task is suspended on resource type Any_MRCB, with a resource name equal to the intrapartition queue name.
Waits on Any_MRCB should not be prolonged, except in a heavily loaded system.