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 ?
Because the level at which the rule is triggered has not been adjusted as prices have risen, the restriction recently has been triggered daily, even as markets continued to function well.
RAP #17 (Psychotropic Drug Use) is triggered because Jon's MDS indicates an antipsychotic drug (04a = 1-7) and motor agitation (H1c has been checked).
In addition, they can be triggered by anything from a shareholder's death to an irresolvable shareholder dispute.
Under the "discovery" rule, the statute is triggered when the taxpayer knows to a reasonable degree of certainty that the defendant's tax error or omission Will result in damages.
If the tax account has already been triggered by a notice or letter for a tax amount over $100,000, interest continues to accrue at the higher rate until the entire balance is fully paid.
He calls these "candidates" for triggered earthquakes, cautioning that they may have been unrelated to the great quake.
Ahmad and Smith found that during computer simulations, the increased fluid pressure from the well spreads 12 km away into the proposed fault--to an extent that the pressure could have triggered the 1986 quake by reducing friction along the fault.
As with deferred stock gain, a deferred stock loss is always triggered by a Sec.
When muscle contraction was triggered without transmitters, relaxation rates were not affected.