trigger


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Related to trigger: Trigger finger

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 ?
When reinstalling the carbine two-piece sheet metal trigger guard and trigger plate, it helps to first install the large guard screws at both ends of the trigger guard; this helps align the holes in the trigger guard and trigger plate for the two smaller screws.
Under his direction a very talented design team developed the AccuTrigger, proving it was possible to offer a safe, reliable and quality trigger out of the box at a reasonable cost.
AIRBORNE ARMS: Airborne Arms, LLC, released an interesting single-stage competition trigger earlier this year named "Geronimo." Trigger design is conventional AR-15, except the hammer is lightened and the aluminum trigger bow is replaceable (see lead photo).
The pathogenesis of trigger finger begins with inflammation of the flexor tendons and the tendon sheath.
Of course, the signal source must satisfy your selected trigger condition sufficiently often that it's possible to achieve the desired update rate.
Installing a trigger in an AR can seem difficult or intimidating.
While the installation of a custom trigger is normally a no-go on an agency-owned sidearm, it is certainly an option on a personally owned duty or off-duty gun.
Figure 1 shows the way edge triggering works with the negative edge resulting in a digital trigger output shown in the lower part of the diagramme, which is transmitted across an RS422 interface.
The trigger pulse duration ti must be at least one cycle period (= 1/measuring rate).
"In the vast majority of migraine sufferers the triggers act in combination with many other triggers.
Yet, while cart abandonment can be detrimental to revenue, there are several other merchandizing triggers marketers are ignoring that cripple sales.
Each of these examples demonstrates how various events trigger corresponding alerts.