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trigger
(redirected from Trigger mechanism)

    Also found in: Medical, Legal, Wikipedia 0.03 sec.

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.

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.
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
(database)trigger - 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].


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? Mentioned in ? References in periodicals archive
 
1) We speculate that the trigger mechanism for the formation of solitary polyps might be local factors, such as increased exposure of irritants and/or mucosal contact, instead of systemic factors, which result in disseminated nasal polyposis.
Solitary polyps of the uncinate process by Cakmak, Ozcan / Ear, Nose and Throat Journal
They can easily carry the object with them, creating a trigger mechanism to reinforce the suggestions.
Expectation and stress management by Holder, Philip / Subconsciously Speaking
Generally, single-action handguns come with manual devices that disable the trigger mechanism so that users can carry the weapon with the hammer cocked and ready to fire but locked so that it cannot be activated until the release of the safety--also known as "cocked and locked.
Selecting a duty-issue handgun by Buehler, Jon H. / The FBI Law Enforcement Bulletin
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