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)