IBM Mainframe Forum

[DieZ]

Are there any special precautions to be taken when developing CICS applications in a CICSplex as opposed to a (rare case ?) single CICS region in a given z/OS image ? Any EXEC CICS API where you would like to think twice ? How about the usage of work areas, especially CWA ? Or, TWA ?

[DieZ]

My understanding is as follows - hopefully, not completely off my rocker !

CWA is specific to a region and therefore, other regions in the CICSplex wouldn't know about the CWA of a given region. Therefore, a given application that runs on different regions cannot share the CWA that is specific to a region. So, if using a CWA, then the CWA should be loaded once and only once across all regions and applications have read only access (EXECKEY(USER) ?)

Whereas, TWA is limited to a given transaction alone; that is, TWA was not designed to be shared across transactions but within a transaction. So, running in different regions should be fine.