The Log Catalog holds information about the IDMS logs which are available for the use of PowerExchange log-based capture. During the initial installation of PowerExchange, a Log Catalog VSAM file will be created (default naming will be &HLQ..LOGSCAT) and a dummy record will be added.
For IDMS log-based capture to work effectively, it is vital to ensure that the log catalog is updated in a timely fashion and that log information is both secure and available. If the logs are not in the catalog, the records they hold will be unknown to PowerExchange. The correct way to add information to the catalog is to use utility DTLULCAT to format the input, then run DTLULOGC to amend the Log Catalog with that prepared input.
RUNLIB member DTLULCAU is supplied to run the two utilities one after the other. It is expected that this be scheduled to run as soon as the latest IDMS log had been spooled off. There may, however, be times when DTLULOGC is run in isolation, involving manual coding of the input file.
Correct scheduling of the addition logs to the Log Catalog is vital to obtaining timely data from the log-based IDMS capture environment.