trigger

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trigger

Machinery a device that releases a spring-loaded mechanism or a similar arrangement

trigger

[′trig·ər]
(computer science)
To execute a jump to the first instruction of a program after the program has been loaded into the computer. Also known as initiate.
(electronics)
To initiate an action, which then continues for a period of time, as by applying a pulse to a trigger circuit.
The pulse used to initiate the action of a trigger circuit.
(ordnance)
A metallic item, part of the firing mechanism of a firearm, designed to release a firing pin by the application of pressure by the finger.

Trigger

Roy Roger’s horse. [TV: “The Roy Rogers Show” in Terrace, II, 260]
See: Horse

trigger

(database)
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].

trigger

(1) A mechanism that initiates an action when an event occurs such as reaching a certain time or date or upon receiving some type of input. A trigger generally causes a program routine to be executed.

(2) In a database management system (DBMS), a trigger is an SQL procedure that is executed when a record is added or deleted. It is used to maintain referential integrity in the database. A trigger may also execute a stored procedure. Triggers and stored procedures are built into DBMSs used in client/server environments. See intelligent database.

(3) A condition that initiates the harmful effects of a logic bomb such as many viruses and worms. Many forms of malicious software use particular dates as triggers. Some viruses count the number of infections and trigger their payloads at a specific number.
References in periodicals archive ?
Mr Kirk's latest brush with the law started when he bought a replica World War I bi-plane which came complete with a decommissioned and triggerless Lewis machine gun.
Hunters often use triggerless back-tension releases during the off-season to fine-tune their form.
Stanislawski[R]'s new Micro III[TM] is a triggerless release available in Deuce[TM] (two finger), Trio[TM] (three finger), Quattro[TM] (four finger), and Smoothie[TM] versions in large and medium hand sizes.