When initiating data sharing for an area, its definition must not conflict with that of any other area that is currently being accessed by a group member in the shared mode. Furthermore, if another member of the group is accessing the area in a shared mode at the time the DCMT command is issued, the definitions of the area in both systems must be identical. If these conditions are not met, a warning is issued when the DCMT VARY AREA command is issued. The status of the area cannot be changed to RETRIEVAL or UPDATE until the condition is corrected. Additionally, before the area can be varied online, files associated with the target area must be assigned to a shared cache or there must be a default shared cache associated with the system.
None of the above restrictions apply if the area will be accessed in a transient retrieval mode.
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