Before a journal file can be used by a system, it must be formatted. When doing so, it might be necessary to specify a size for the journal data store. This is an area reserved at the start of every journal file that is used to record information about other systems with which a system communicates. In most cases, the default size is sufficient and no explicit size parameter is needed; however, if a system's journal block size is very small, or if it communicates with many other CA IDMS or CICS systems, it may be necessary to reserve additional space. If a journal's available space is exhausted, attempts to communicate with a new system will fail. It will then be necessary to shut down the system, offload and format the journal files, and restart the system before communicating with a new system.
You specify a size for the journal data store by specifying a DATA STORAGE SIZE parameter on the FORMAT JOURNAL statement. All journal files used by a system must be formatted with the same data store size. Once a journal file has been formatted for the first time, it can be reformatted using the FAST option. This parameter directs the utility to format only the journal headers which is a much faster process than formatting the entire file.
For more information about formatting journal files, see the CA IDMS Utilities Guide.
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