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 ?
The maximum 1 hour rainfall is 21mm on July 10th and Lianshan Bridge debris flow triggered at the same time around 3 am.
Fluid flow triggers a variety of responses in vascular endothelial cells (ECs), such as initiation of signal transduction, modulation of gene expression, and remodeling of cytoskeletal and related structures.
A paper, 'The December 2012 Mayo River debris flow triggered by Super Typhoon Bopha in Mindanao, Philippines: Lessons learned and questions raised,' published in the journal of Natural Hazards and Earth Systems Sciences, posits that the high fatality rate was caused in part by lack of preparedness and swift action on the part of national and local authorities.
On Friday morning, at least 10 families (50 people) living along river channels in Barangay (village) Mapaso near Mount Bulusan in Irosin town, Sorsogon, were evacuated due to threats of lahar flow triggered by heavy rain since Thursday, a report from the Regional Disaster Risk Reduction and Management Office (RDRRMC) said.