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 ?
In order to overcome the drawback of time triggered maneuver planning method mentioned previously, we developed a novel and smarter onboard autonomous maneuver planning method, as shown in Figure 2.
Transfer time, fuel consumption, passive safety, and other constraints can be taken into consideration in the basic maneuver profile, using the time triggered optimal maneuver planning layer; however it is beyond the scope of this paper.
This protocol is based on a hybrid communication scheme combining time triggered (TT) and event triggered (ET) traffic with temporal isolation and they are handled by time slot dedicated to each one.
SCoCAN (Shared Channels on CAN--Canales Compartidos sobre CAN) es un protocolo de alto nivel por encima de la capa de enlace de datos de CAN, y que utiliza un esquema de comunicaciones hibrido, combinando trafico Time Triggered (TT) y Event Triggered (ET), pero separados temporalmente, es decir, con asignacion exclusiva de ancho de banda para cada tipo de trafico.
We even saw how a system integrator achieved negative latency, completely eliminating over-the-wire transit times and using time triggers to overlap instrument settling and analysis times.
Failure to leave on time triggered the start of legal proceedings designed to move them forcibly.
The oesophagus isn't lined like the stomach and so stomach acid irritates the lower oesophagus and over time triggers precancerous changes that can progress to cancer.
However, for monitoring of temporal and spatial variations autonomous event and/or time triggered in situ fixation instruments are essential on ocean observatories.
FlexRay is fault tolerant and time triggered, providing dependable delivery of messages for safety applications.