MSDB Checkpoint Data Set list

If you run IMS DEDB Fast Recovery with MSDB=Y or MSDB=O specified, an MSDB checkpoint data set list is generated in the data set specified by the SYSPRINT DD statement.

The following figure shows an example of the MSDB Checkpoint Data Set list.

Figure 1. MSDB Checkpoint Data Set list

IMS DEDB FAST RECOVERY V2R2     --- MSDB CHECKPOINT DATA SET LIST                     TIME  15:03:00   DATE   9/04/2021    P -   1 

 
MSDB= PARAMETER  : O 
 
SELECTED DSN FOR ALL MSDBCP DD : IMS.MSDBCP1 
 
CURRENT FP CHECKPOINT ID : 21247/1458224

DD NAME  STATUS                CHECKPOINT ID    DATA SET NAME                                 
 
MSDBCP1  VALID                  21247/1458224   IMS.MSDBCP1
MSDBCP2  ONLY INIT                  N/A         IMS.MSDBCP2 
 
END OF REPORT

Report field descriptions

The first three lines in the figure give the following information:

MSDB=PARAMETER: The MSDB= parameter value specified for the IMS DEDB Fast Recovery JCL.
SELECTED DSN FOR ALL MSDBCP DD: The name of the MSDB checkpoint data set selected and specified by IMS DEDB Fast Recovery in the input JCL for MSDB Dump Recovery utility. It is generated only when MSDB=O is specified.
CURRENT FP CHECKPOINT ID: The current Fast Path checkpoint ID. It is used to compare with the checkpoint ID in the MSDB checkpoint data set. This line is not generated if an error occurred at the beginning of an IMS DEDB Fast Recovery run before the Fast Path checkpoint was determined.

The table in the figure shows the following information:

DD NAME

The DD name of the MSDB checkpoint data sets.

STATUS

The data set status, as follows:

VALID: The data set is valid for MSDB recovery.
ONLY INIT: The data set has not been used since IMS cold start.
UNAVAIL: The data set is not valid for MSDB recovery.
OPEN ERROR: The data set cannot be opened.
NO ALLOC.(NO DD): There is no DD statement specification for the DD name in the IMS DEDB Fast Recovery JCL.
NO ALLOC.(DUMMY): DUMMY is specified for the DD name in the IMS DEDB Fast Recovery JCL.
EMPTY: The data set specified is empty.
RDJFCB ERROR: The RDJFCB macro was unsuccessful.
XRF/NON-XRF CONFLICT: The IMS DEDB Fast Recovery run mode and the information in the MSDB checkpoint data set are inconsistent.

CHECKPOINT ID

When the STATUS column is VALID, it is the checkpoint ID, including the MSDB checkpoint data set. When the status is XRF/NON-XRF CONFLICT, it is the checkpoint ID with brackets. For other status, N/A is shown.

DATA SET NAME

The name of the MSDB checkpoint data set. When the data set name is unknown, N/A is shown.