An action causing the automatic invocation of a procedure, for instance to preserve referential integrITy. A triggers goes into effect when a user attempts to modify data wITh an insert, delete, or update command. A trigger can instruct the system to take any number of actions when a specified change is attempted. By preventing incorrect, unauthorized, or inconsistent changes to data, triggers help maintain the integrITy of the database. [Sybase SQL Server Release 10.0 Transact-SQL User' s Guide]. (1995-02-22)