n is either 1 or 0. The default value is 0.
When DDLNo30 is enabled (n = 1), when an attempt is made to DROP a nonexistent table, InterSystems IRIS® data platform suppresses the SQLCODE -30 error. When this parameter is not enabled, InterSystems IRIS returns the error.
Changing This Parameter
On the SQL page of the Management Portal (System Administration > Configuration > SQL and Object Settings > SQL), select Ignore redundant DDL statements to suppress redundant SQLCODE errors.
You can also change DDLNo30 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).