When an operator interrupt occurs on the currently executing transaction, the Ingres transaction processing system responds according to the operating system used:

Windows: The Ingres transaction processing system recognizes the interrupt signal, Ctrl+C. When the user enters a Ctrl+C through a terminal monitor during transaction processing, the DBMS interrupts the current statement and rolls back any partial results of that statement. Additional use of Ctrl+C is ignored (unless an additional statement is added to the transaction). The transaction remains open until terminated by a COMMIT or ROLLBACK statement.

UNIX: The Ingres transaction processing system recognizes the interrupt signal Ctrl+C. When the user enters a Ctrl+C through a terminal monitor during transaction processing, the DBMS interrupts the current statement and rolls back any partial results of that statement. If there is no statement currently executing, Ctrl+C has no effect. Ctrl+C has no effect on the state of the transaction and does not cause any locks to be released.

VMS: The Ingres transaction processing system recognizes two interrupt signals, Ctrl+C and Ctrl+Y, when they are entered through a terminal monitor. When the user enters a Ctrl+C through a terminal monitor during transaction processing, the DBMS interrupts the current statement and rolls back any partial results of that statement. If there is no statement currently executing, Ctrl+C has no effect. Ctrl+C has no effect on the state of the transaction and does not cause any locks to be released.A Ctrl+Y character causes the DBMS to roll back a transaction in progress. The use of Ctrl+Y and the use of the VMS STOP command are strongly discouraged.