IBM SC34-7012-01 START with recoverable data PROTECT, START with nonrecoverable data no PROTECT

intended for the started task, but does not back out the START request itself. Thus the new task will start at its specified time, but the data will not be available to the started task, to which CICS will return a NOTFND condition in response to the RETRIEVE command.

START with recoverable data (PROTECT)

Transaction backout of the task issuing the START command causes the START request and the associated data to be backed out. If the abended transaction is restarted, it can safely reissue the START command without risk of duplication.

START with nonrecoverable data (no PROTECT)

Transaction backout of the task issuing the START does not back out either the START request or the data intended for the (canceled) started task. Thus the new task will start at its specified time, and the data will be available, regardless of the abend of the issuing task.

START with nonrecoverable data (PROTECT)

Transaction backout of the task issuing the START command causes the START request to be canceled, but not the associated data, which is left stranded in temporary storage.

Note: Recovery of temporary storage (whether or not PROTECT is specified) does not cause the new task to start immediately. (It may qualify for restart like any other task, if RESTART(YES) is specified on the transaction resource definition.) On emergency restart, a started task is restarted only if it was started with data written to a recoverable temporary storage queue.

Restart of started transactions:

Non-terminal START transactions that are defined with RESTART(YES) are eligible for restart in certain circumstances only.

The effect of RESTART(NO) and RESTART(YES) on started transactions is shown in Table 1.

Table 1. Effect of RESTART option on started transactions

Description of	Events	Effect of	Effect of
non-terminal START		RESTART(YES)	RESTART(NO)
command
Specifies either	Started task ends	START request and its	START request
recoverable or	normally, but does	data (TS queue) are	and its data (TS
nonrecoverable data	not retrieve data.	discarded at normal	queue) are
		end.	discarded at
			normal end.
Specifies recoverable data	Started task	START request and its	START request
	abends after	data are recovered and	and its data are
	retrieving its data	restarted, up to n¹	discarded.
		times.
Specifies recoverable data	Started task	START request and its	START request
	abends without	data are recovered and	and its data are
	retrieving its data	restarted, up to n¹	discarded.
		times.
Specifies nonrecoverable	Started task	START request is	Not restarted.
data	abends after	discarded and not
	retrieving its data	restarted.

Chapter 8. Unit of work recovery and abend processing 77