If you select the -JOURNAL option when you ADD or CHANGE a region in a Global Directory, the following section is added to your Global Directory and displays when you invoke SHOW. The columns provided display the values you selected with the journal options, or defaults provided by FIS for any options not explicitly defined.

*** JOURNALING INFORMATION ***
Region Jnl File(ext:.mjl)   Before  Buff  Alloc    Exten
--------------------------------------------------------------
DEFAULT <based on DB file> Y   128  100   100

For more information about journaling, see the section on the JOURNAL qualifier in this chapter and Chapter 6: “GT.M Journaling”.