trigger

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trigger

Machinery a device that releases a spring-loaded mechanism or a similar arrangement
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Trigger

Roy Roger’s horse. [TV: “The Roy Rogers Show” in Terrace, II, 260]
See: Horse
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.

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].
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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.
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References in periodicals archive ?
Noting that pressures for democratization predated the developments in Eastern Europe, she declares that "domestic pressure triggered the reforms" (p.
12, 2011 (CENS) -- With Asia facing mounting inflationary pressure triggered by soaring international wheat prices, the Executive Yuan (the Cabinet) is gearing up to fight the onset of inflation, including increasing self-supply rate for food.
But her world fell apart when she developed pre-eclampsia, dangerously high blood pressure triggered by pregnancy.
The stock remained under heavy selling pressure triggered by Wednesday's government announcement that it will terminate the operating licenses of most of the nursing-care centers run by Comsn for fraudulent license applications.
The Virginia researchers studied 606 women aged 13 to 87 (with a mean age of 46) and uncovered a statistically significant relationship between smoking and all forms of urinary incontinence, including "stress" incontinence, in which abdominal pressure triggers the loss of small amounts of urine, and another type that involves large urine spills.
Lena shot to fame aged nine and sang with Frank Sinatra and Liza Minnelli before the pressure triggered the illness which caused her death.
On the Tokyo Stock Exchange on Wednesday, the Nikkei average of 225 major stocks fell 1.95% to close at 11,892.58 under strong selling pressure triggered by a pessimistic earnings forecast from Intel Corp., the world's largest chip maker.