IBM SC34-7012-01 manual Procedure for failed non-RLS mode forward recovery operation

Procedure for failed non-RLS mode forward recovery operation

If you are not successful in applying all the forward recovery log data to a restored backup, you are forced to abandon the forward recovery, and revert to your most recent full backup.

However, during its recovery processing, CICS assumes that it is operating on a data set that has been correctly forward recovered, as in the case of recovery of a data set accessed in RLS mode (see “Procedure for failed RLS mode forward recovery operation” on page 198).

If you are not able to complete forward recovery on a data set, ensure that all CICS regions tidy up any pending recovery processing on the data set (as described below) before you restore the backup copy from which you intend to work. You can do this in the following way:

1.Make sure that any CICS regions that are not running, and which could have updated the data set, are restarted to enable emergency restart processing to drive outstanding backouts.

2.If there are shunted indoubt units of work, try to resolve the in-doubts before proceeding to the next step. This is because the indoubt units of work may have updated resources other than the failed data set, and you don’t want to corrupt these other resources.

3.In all CICS regions that could have updated the failed data set: v Force shunted indoubt units of work using set DSNAME(...)

UOWACTION(COMMIT BACKOUT FORCE).

Before issuing the next command, wait until the SET DSNAME(...) UOWACTION has completed against all shunted indoubt units of work.

vReset locks for backout-failed units of work using SET DSNAME(...)

RESETLOCKS.

Do not issue this command until the previous UOWACTION command has completed. RESETLOCKS operates only on backout-failed units of work, and does not affect units of work that are in the process of being backed out. If you issue RESETLOCKS too soon, and shunted indoubt units of work fail during backout, the data set will be left with recovery work pending.

4.Finally, when you are sure that all CICS regions have completed any recovery work for the data set, restore the backup.

If you do not follow this sequence of operations, the restored backup could be corrupted by CICS backout operations.

Chapter 17. Forward recovery procedures 201