NDB Concepts › NDB Journaling

NDB Journaling

In addition to the preformatted journal area kept within an NDB, an external journal can be created. This journal allows:

• Continuous availability of an NDB that cannot regularly be stopped for backups
• Recoverability of an NDB to the time of last update, even in the event of physical data set failure

To enable journaling on an NDB, specify the JOURNAL operand on the NDB START command. This operand causes the after images of all NDB record updates to be written to the journal.

Note: Before images are not kept; therefore data set back out is not possible.