Caché Parameter File Reference
DDLNo311
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Suppress/return error upon ADD a foreign key, when a key of that name already exists.
Synopsis
[SQL]    DDLNo311=n
Description
The value n may be 1 or 0:
Examples
DDLNo311=0
Range of Values
0 or 1. The default is 0.
Management Portal
On the page System Administration > Configuration > SQL and Object Settings > General SQL Settings, for the Allow DDL ADD Foreign Key Constraint when Foreign Key Exists setting, choose Yes (true) or No (false).