Journalname statistics

CICS® collects statistics on the data written to each journal which can be used to analyze the activity of a single region.

Journalname statistics contain data about the use of each journal, as follows:
  • The journal type (MVS logger, SMF, or dummy)
  • The log stream name for MVS logger journal types only
  • The number of API journal writes
  • The number of bytes written
  • The number of flushes of journal data to log streams or SMF.

Note that the CICS system journalname statistics for the last three items on this list are always zero.

Journalnames are a convenient means of identifying a destination log stream that is to be written to. CICS applications write data to journals with journalname. CICS itself usually uses the underlying log stream name when issuing requests to the CICS log manager, and this must be considered when interpreting journalname and log stream resource statistics. For example, these may show many operations against a log stream, but relatively few, if any, writes to a journalname which maps to that log stream. This indicates that it is CICS that accesses the resource at the log stream level, not an application writing to it through the CICS application programming interface. These results can typically be seen when examining the journalname resource statistics for DFHLOG and DFHSHUNT, and comparing them with the resource statistics for their associated CICS system log streams.

For more information about logging and journaling, see CICS logging and journaling.