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How Large Will Your Diagrams Be?

The size of the data structure diagram primarily depends on the size of the schema or subschema being diagrammed. Other factors that can affect the size of a diagram are:

• The configuration of the schema or subschema
• The size of each record block and set description, as determined by the number, length, and organization of fields
• The border space around record blocks.

The size of CA IDMS Schema Mapper's IDMSNWKA diagram may give you an idea of a diagram's size. IDMSNWKA (the subschema for the CA IDMS database) is eight pages by eight pages (nine feet by seven feet, using 11" by 14" perforated paper). It has 151 records and 227 sets.

If your diagrams of schemas seem too large, you can run CA IDMS Schema Mapper for areas or subschemas rather than schemas. Another option, which has good results in reducing the size of diagrams, is to photo reduce the diagrams.

The maximum size that an assembled CA IDMS Schema Mapper data structure diagram can be is 26 pages wide by 26 pages long. You probably won't have any diagrams even close to this size.

Assuming a DPAGEWID value of 132 and a DPAGELEN value of 66, the maximum dimensions allow 3,354 characters across (26 pages by 129 characters) and 1,716 characters down (26 pages by 66 characters) from the initial reference point.

The right three character positions of each line are reserved for page identifiers, such as AA, other information, such as the date and schema/subschema name, and a blank character space to separate this information from the diagram.