NetMaster Database Administration › How to Implement NDB Journaling › Define Two Journal Data Sets

Define Two Journal Data Sets

Use IDCAMS to define two VSAM entry-sequenced data sets (ESDS). The following parameters are required (use sample $NDIDCDJ):

NONINDEXED

Indicates an ESDS.

REUSE

Journal is cleared when opened for update.

RECORDSIZE

Journal record size should be greater than the record size minus key length + 60 of the largest NDB using the journal.

The space allocated to the journal depends on the number of NDB updates occurring on the system, and the frequency with which you swap journals for batch processing. The volume should ideally be on a separate unit to the NDBs being journaled.