Certain CA Datacom Datadictionary activity, such as adding columns (FIELD entity-occurrences) to a table, or updating attributes of fields, keys, and tables, affects a constraint. These changes affect different types of constraints in different ways. For example, they could invalidate the constraint or the data in either the modified or a related table.
The following sections are organized by the action you are performing and describe the type of effect the action has on Check, Foreign, and Unique constraints. For Unique constraints, the Foreign keys that reference them can also be affected and when they are, it is so noted in the following discussions.
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