You must define an archive journal if you are journaling to disk files. When a disk journal file is full, you offload the disk journal to the archive journal. While the offload occurs, CA IDMS/DB journals to another disk journal.
You can define multiple archive journals associated with one DMCL. When you invoke the ARCHIVE JOURNAL utility statement to offload a disk journal file, CA IDMS/DB writes the contents of the disk journal to each archive file associated with the DMCL. Therefore, if during the course of manual recovery, an archive file is unreadable, you can attempt recovery using an alternate archive journal file.
You cannot include the definition of a tape journal file in the DMCL if you include the definition of disk and archive journal files.
When a DMCL is generated, the block size associated with an archive journal is checked to ensure it is not less than the block size of the disk journals. Since the block size of the disk journals is derived from the page size of the journal buffer, if the archive journal's block size is less than the page size of the journal buffer, the page size of the journal buffer is used and a warning message issued.
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