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Size of Subschemas

Subschemas for navigational DML access should be specified to the requirements of the application. The size of the currency block is directly related to the storage requirements of the variable subschema storage block (VB50) used at run time; the runtime system maintains currency tables for every record, set, and area in a subschema, regardless of whether they are accessed by the dialog. Therefore, it is worthwhile to make subschemas as streamlined as possible.