Specify referential constraint rules

Referential constraints allow you to specify rules that you want the system to enforce when you delete or update records.

1. Run the Add Physical File Constraint (ADDPFCST) command.
2. Specify the rule that you want to enforce when you delete records (the delete rule) by choosing a value for the DLTRULE parameter.
3. Specify the rule that you want to enforce when you update records (the update rule) by choosing a value for the UPDRULE parameter.

• Details: Specify referential constraint delete rules
  This topic lists the possible values for the DLTRULE parameter. The delete rule specifies the action the system takes when you delete a parent key value. The delete rule does not affect null parent key values.
• Details: Specify referential constraint update rules
  This topic lists the possible values for the UPDRULE parameter. The UPDRULE parameter identifies the update rule for the constraint relationship between parent and dependent files. The update rule specifies the action the system takes when it attempts to update the parent file.
• Details: Specify referential constraint rules—journaling requirements
  If you perform insert, update, or delete operations on a file that is associated with a referential constraint and the delete rule, update rule, or both are other than *RESTRICT, you must use journaling.