n is either 1 or 0. The default value is 1.
When ReferentialChecks is enabled (n = 1), InterSystems IRIS® data platform validates the foreign key constraint for INSERT, UPDATE, DELETE, and TRUNCATE TABLE operations. When this parameter is not enabled, InterSystems IRIS bypasses validation of foreign key constraints.
Changing This Parameter
You can also change ReferentialChecks with the Config.SQL class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).