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Queue

An ordered collection of persons or things in which one is serviced after another. For example, persons may form a queue to buy tickets to the cinema. Likewise, an employee may form a list of tasks to be done each day and perform them each in turn. The word queue is most common in Britain and the Commonwealth; the equivalent in American English is waiting line or simply line.

queue

the build-up of customers who are delayed while waiting for service. Queuing can occur in a retail outlet where shoppers queue at supermarket checkouts or cars queue on petrol station forecourts. Similar queuing problems occur in factories where components queue to be processed on machines.

Variability in the demand for service and the variable time to complete service makes it difficult to judge the level of service to provide for customers. Where numerous service channels are provided, customers will experience few delays even when many customers arrive simultaneously for service. On the other hand, providing numerous service channels involves large labour costs, as in the case of supermarket checkout staff or bank clerks, or large investment in physical facilities, such as tanker berths or airport runways.

Queuing models employing statistical techniques can be used to analyse queues and to balance the cost of resources used to provide service against the cost of the time lost by customers while waiting for service.

These models consider the number of potential customers; the likely rate at which they arrive; whether they arrive singly or in batches; the number of parallel queues; maximum queue length; order of service (first come, first served or prioritized); number of servers; likely service time; and whether customers are served singly or in batches. For complex queues, SIMULATION techniques may be employed to decide the level of service to provide and how to organize the service facilities. See BALK, MULTIPLE CHANNEL-SINGLE PHASE.

References in periodicals archive ?
This request object is sent to the server into the Camera Requests Message Queue (CRMQ).
From a single platform, enterprise data warehouses now can capture and load transactional data within seconds (often through "trickle feeds" or enterprise application integration message queues).That same platform also can run powerful new analytical applications, which continuously monitor and detect events and then perform in-depth analysis and suggest potential actions by drawing on extraordinarily deep business intelligence at the time the event occurs.
Intended for intermediate developers, this book introduces the GNU tools needed to build, segment, test, profile, and distribute Linux applications, and describes some of the most useful services available within the GNU/Linux environment, such as pipes, sockets programming, POSIX threads, message queues, semaphores, and shared memory management.
It's absolutely critical that the system not be experiencing slow message queues and that external email delivery times remain within acceptable tolerances, especially to key business partners or customers.
This enterprise-ready functionality allows organizations to centralize transformation rules and schemas, plug into workflow engines and message queues, make transformations available as Web services and connect to virtually any back-office system.
* Generate Visual Basic and Java source code, classes and packages to copy RDB data into XML output files message queues. Also work in reverse: copy XML data from flies or message queues into database table columns
Its software ensures that the right components interact with the right message queues. It doesn't do MQSeries administration per se.
He added: "We are a large AS/400 site now, but, even when we reduce the number of AS/400s we have to six, monitoring message queues on a day-to-day basis will be a mammoth task.
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An API has been built which the developers invoke to put a particular message onto one of the server-side message queues.
For example, in many e-mail and messaging applications, the message queues represent a high percentage of the total I/O on a small percentage of the data.

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