Recoverability of commands and execution modes

IMS commands (except /DIS, /RDIS, and /FOR) and test-mode input are executed immediately without being placed on an input message queue. These commands complete all processing prior to causing output to be made available using a transaction sync point. Any failure causes the command or test mode transaction input and associated output message to be backed out and discarded.

IMS commands /DIS, /RDIS, and /FOR produce asynchronous queued output. Output that is enqueued prior to the failure is recovered and made available for asynchronous transmission when the session is reestablished.

Fast Path, recoverable response mode, and recoverable conversational mode transactions are backed out and discarded if the failure occurs before a transaction sync point. The fact that the session was in response mode is not recovered.