A raise statement raises an exception.
raise_statement ::= raise [exception_name];
For the execution of a raise statement with an exception name, the named exception is raised. A raise statement without an exception name is only allowed within an exception handler (but not within the sequence of statements of a subprogram, package, task unit, or generic unit, enclosed by the handler); it raises again the exception that caused transfer to the innermost enclosing handler.
Examples:
raise SINGULAR; raise NUMERIC_ERROR; -- explicitly raising a predefined exception
raise; -- only within an exception handler
References: exception, generic unit, name, package, sequence of statements, subprogram, task unit.