Recovery log data set

When you run the Log Archive utility to create an SLDS, you can also request creation of an recovery log data set (RLDS). The RLDS can be stored on DASD, tape, or other mass storage device.

The RLDS contains only the log records needed for database recovery:

X'24'

Database error records

X'3730'

Sync point records

X'4001'

Checkpoint records

X'4084'

Checkpoint records that contain Fast Path DMCB/DMAC control blocks.

X'4098'

Checkpoint records for the end of Fast Path checkpoints.

X'42'

Checkpoint ID records

X'5612'

End of phase 2 commit records

X'5701'

Database begin update records

X'59'

Fast Path database change records

X'505x'

Database change records

IMS maintains RLDS information in the RECON data set in the PRILOG and SECLOG records. Whenever possible, DBRC uses the RLDS in place of SLDSs when creating JCL for the Database Recovery and Database Change Accumulation utilities. Using the RLDS rather than the SLDS is more efficient because the RLDS contains less information than the SLDS.