Page reserve is the amount of space on a page that is used only for the expansion of existing records or rows. It is never used for storing new occurrences.
Specifying a page reserve as part of an area definition is useful if the area contains:
The page reserve for an area can also be specified as an area override within a DMCL definition. Specifying it at the DMCL level allows tailoring the page reserve for particular types of processing, such as database loading or index building. By specifying a page reserve during these types of operations and then reducing or removing it altogether, you ensure that each page will contain free space for both new record occurrences or rows and the expansion of variable length objects.
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