IBM SC34-7012-01 Implementing forward recovery with user-written utilities, Backward recovery

-File is defined with RECOVERY(ALL): the open fails.

–Base cluster has RECOVERY(ALL):

-File is defined with RECOVERY(NONE): the open fails.

-File is defined with RECOVERY(BACKOUTONLY): the open fails.

-File is defined with RECOVERY(ALL): the open proceeds unless FWDRECOVLOG specifies a different journal id from the base cluster, in which case the open fails.

Any failure to open a file against a data set results in a message to the console. If necessary, the recovery options must be changed. To change the recovery attributes (held in the base cluster block) of a VSAM data set, you can use the CEMT, or EXEC CICS, SET DSNAME REMOVE command. This deletes the base cluster block, so CICS has no record of prior recovery settings for the VSAM data set. The next file to open against this data set causes a new base cluster block to be built and, if the file is opened for update, the data set takes on the recovery attributes of this file.

The base cluster block, together with its recovery attributes, and the inconsistency condition that may be set if you are using XFCNREC, are preserved even when all the files relating to the block are closed, and across warm and emergency restarts.

Implementing forward recovery with user-written utilities

If you use your own forward recovery programs, you must ensure they use the after images from the forward recovery log streams. The use of autojournal records written to a general log stream is not recommended for VSAM forward recovery.

About this task

For details of procedures for performing forward recovery, see Chapter 17, “Forward recovery procedures,” on page 187.

For programming information about the format of log and journal records, see the CICS Customization Guide.

Implementing forward recovery with CICS VSAM Recovery

MVS/ESA

You can use CICS VSAM Recovery MVS/ESA (CICSVR) to recover lost or damaged VSAM data sets.

About this task

For details, see Forward recovery with CICS VSAM Recovery.

Recovery for intrapartition transient data

This section deals with both backward and forward recovery of intrapartition transient data.

Backward recovery

CICS can recover only intrapartition transient data. The intrapartition data set is a VSAM ESDS data set, with a file name of DFHINTRA.

Chapter 12. Defining recoverability for CICS-managed resources 131