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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 that is used for the diagram. Other factors that can affect the size of a diagram are:

• The configuration of the schema or subschema
• The size of each record block, 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.

Also, a schema containing 45 records, 51 sets, and eight indexes constituted a CA IDMS Schema Mapper diagram that was four pages by three pages (four feet by three feet, depending on paper size). This diagram was produced using the default formats and allowing CA IDMS Schema Mapper to automatically layout the records.

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.

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.

Exhibit 1.3: Wallpapering the CA IDMS Schema Mapper Structure Diagram