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What is a message queue?

A message queue is a component of messaging middleware solutions that enables independent applications and services to exchange information. Message queues store “messages”—packets of data that applications create for other applications to consume—in the order they are transmitted until the consuming application can process them. This enables messages to wait safely until the receiving application is ready, so if there is a problem with the network or receiving application, the messages in the message queue are not lost.

This model, known as asynchronous messaging (15:11), prevents data loss and enables systems to continue to function if processes or connections fail. This allows developers to keep processes and applications separate, keeping their communications self-contained and event-driven to make the architecture more reliable.

Message queues are available in messaging solutions across numerous deployment options, including optimized physical appliances, cloud services, mainframes, and as software.

Benefits

Message queuing solutions are widely used across industries and can offer an array of benefits to developers and system administrators alike, including the following: Casino m in las vegas.

• Reliable message delivery: Using a message queue can ensure that business-critical messages between applications will not be lost and that they will be only be delivered to the recipient once. With this feature in place, additional de-duplication or loss-prevention logic is unnecessary.
• Inter-application connectivity: Some message queue solutions can handle message encryption, transactionality, and other communication aspects between applications and services. This simplifies application development and enables disparate architectures to work together.
• Versatility: Message queue solutions can support multiple languages, such as Java, Node.js, COBOL, C/C++, Go, .NET, Python, Ruby, and C#. They can also support numerous application programing interfaces (APIs) and protocols, including MQTT, AMQP, and REST, as well as others.
• Resilience: Asynchronous messaging ensures application-specific faults won’t impact the system. If one component in the system stalls, all others can continue interacting with the queue and processing messages. This decreases the chance that the entire system’s stability will be impacted by one part’s failure.
• Improved security: A message queue may be able to identify and authenticate all messages, and in some message queue solutions, they can be set to encrypt messages at rest, in transit, or end-to-end. This can contribute to the overall security of the applications and/or infrastructure.
• Integrated file transfers: Some message queue solutions include additional features, such as the ability to transfer files. This can be used as an alternative to FTP within enterprises where such solutions are in use.

Use cases

Today’s enterprise computing environments are complex and highly decentralized. Messaging makes it easier to integrate applications and services on diverse platforms by providing a single, robust, and secure shared messaging backbone. This protects against data loss and ensures systems will continue to function even with unstable connectivity.

Message queues are uniquely suited for integrating on-premises backend systems with cloud services. In cloud architectures, applications are often broken down into small, independent components. This makes it easier to design and code them, and also easier to manage their performance. Message queues enable these decoupled cloud-based applications to communicate with each other or with on-premises systems.

Message queuing increases architecture resilience because the messages can have persistence. This means they’re stored to disk until the service receiving the message confirms processing. Messaging queues can be used in scenarios requiring high levels of security, fault tolerance, and accuracy, such as financial transaction processing, air-travel booking, or updating healthcare patient records.

Message queues can also be used to enable applications and systems residing in different clouds (whether public or private) to communicate, even if they are located in different countries or even on remote continents. Using a message queue increases fault tolerance and can be used to prevent data being duplicated or lost across geographically and technically disparate systems. Because each service within the system is decoupled, or logically separated from the others, each can continue to function if other services or applications fail or stall.

Message queues work across disparate applications such as mobile, IoT, and traditional transaction system records. They also support various platforms—such as virtual machines and containers—and can enable integration between legacy applications and today’s latest solutions.

Message queue vs. …

Message queue vs. pub/sub

Message queues use a point-to-point messaging pattern, in which one application (called the sender) submits a message to the queue and another application (called the receiver) gets the message from the queue and consumes it. There should be a tightly coupled one-to-one relationship between the sender and consumer, and each message should be consumed only once.

If your applications require messages to be distributed to multiple parties, either multiple message queues can be combined or a publish/subscribe (pub/sub) messaging model can be used.

In pub/sub messaging, the application producing the message is called a publisher and applications consuming it are the subscribers. Each message is published to a topic, and every application that subscribes to that topic gets a copy of all messages published to it.

Most messaging middleware solutions support both the message queue (point-to-point) and pub/sub messaging models.

Message queue vs. message bus

A message bus—a type of enterprise service bus, or ESB—allows services ubiquitous access to data while ensuring they remain decoupled and independently functional within a distributed system architecture. When you employ a message bus, all the services or applications must share common data types, a common command set, and common communication protocols (although, they may be written in different languages). Consumers can determine how they use messages.

If decoupled applications are to communicate via a message bus, the messages must be transformed so that they are all of the same type. In contrast, message queues transport messages, no matter whether they are of the same or different types.

Message queue vs. web services

Applications can communicate directly through web services or APIs based on standard protocols—such as Simple Object Access Protocol (SOAP) or HTTP—instead of via messaging middleware. Web services are widely used in distributed systems, relatively simple, and easy to implement, making them a viable alternative to message queues in certain use cases and scenarios.

Unlike message queues, however, web services cannot guarantee message delivery. If the server or connection fails, you must build the capability to handle the error within the client. Web services also lack pub/sub-distribution models. Messaging middleware offers greater fault tolerance and better ability to handle heavy traffic or activity bursts.

To learn more about when to use APIs, when to use messaging, or when to use both, see “An introduction to APIs and messaging.”

Message queue vs. databases

Databases can be used as an alternative to message queues in certain situations, but most of the time they serve different purposes and are not readily interchangeable. Databases are most commonly used for storage, and they allow you to access the same information over and over again. Message queues cannot be used for storage purposes. Once a message has been consumed, it is deleted from the queue.

Designing message queue-like functionality into a database is possible, but it requires a great deal of coding effort and knowledge. Databases can only be used to replicate simple queue structures and aren’t scalable for larger applications.

Check out “A Brief Overview of the Database Landscape” for more info on databases and their capabilities.

Message-queuing-as-a-service

Message queuing is traditionally administered by dedicated teams within IT. But “as-a-service” delivery—using a cloud-hosted message queue—can enable individuals or line-of-business (LOB) users to request changes to the messaging infrastructure on their own, through a portal, which can increase agility.

Message-queuing-as-a-service naturally works well within serverless or microservices architectures common in cloud-native development. Because it’s offered in a cloud-hosted service model, the cloud provider handles all the provisioning, installation, and maintenance of your messaging infrastructure, and it is hosted in the cloud.

Tutorials

These tutorials will help if you’re new to developing applications that communicate via IBM MQ:

These additional resources will give you a more comprehensive overview:

Message queues and IBM

IBM message queue solutions make life easier for developers by supporting hybrid cloud environments, agile development processes and microservices architectures with an all-in-one messaging backbone. This is especially important as enterprises embark upon application modernization on the journey to cloud.

Take the next step:

• Learn about about IBM Cloud Pak for Integration, which was built on the core capability of IBM MQ, the gold standard among enterprise messaging solutions.

Get started with an IBM Cloud account today.

Simple, secure and container ready — welcome to IBM MQ 9.2

Simple, secure and container ready — welcome to IBM MQ 9.2 Learn more in the announcement blog

Many of the world’s most successful companies rely on MQ

Why MQ?

Massive amounts of data move as messages between applications, systems and services at any given time. If an application isn’t ready or if there’s a service interruption, messages and transactions can be lost or duplicated, costing businesses time and money to make things right.

IBM has expertly refined IBM® MQ over 25 years on the market. With MQ, if a message can’t be delivered immediately, it’s secured in a queue, where it waits until delivery is assured. Where competitors may deliver messages twice or not at all, MQ moves data, including file data, once — and once only. Never lose a message with MQ.

MQ is now available with other capabilities in IBM Cloud Pak for Integration, which can help you achieve your application modernization goals as part of your journey to cloud.

Watch live and on-demand webcasts and demos (link resides outside IBM), including What's new in IBM MQ? (link resides outside IBM), to get to know this and other integration solutions designed to address your business's needs.

Connect

MQ acts as a messaging center between applications on varied platforms. It connects virtually everything wherever it is, reducing integration time and cost, and reliably moving messages.

Protect

MQ is designed for security — with built-in high availability and disaster recovery. It protects data at rest, in-flight and in-memory through fine-grained authentication and powerful data encryption.

Simplify

MQ handles connection and message retries for you, to free developers to spend time on more critical initiatives. It also easily scales to seamlessly manage changes in transaction volumes.

Next-level integration

IBM MQ is just one part of a modern approach to integration. It’s now in IBM Cloud Pak® for Integration with everything else you need to round out your capabilities.

Leading enterprise messaging for mission-critical business applications

Once-and-once-only delivery

Asynchronous messaging

Powerful protection

Simplified, smart management

Balance and rebalance your workload, combine HA and DR, control storage limits, explore our new UI, and gain entitlement to the IBM Aspera® fasp.io. Gateway.

Augmented security

Benefit from updates in TLS 1.3 and dynamically select the cipherspecs that apply. Using AMS? We have Java keystore protection, PKCS#11 Java support and encryption between queue managers (IBM z/OS® only).

Expanded client application options

Run applications in .NET core, integrate better with IBM WebSphere® Liberty, use Java 11 clients and make managed file transfer agents (MFTs) highly available.

Accelerated Red Hat® OpenShift® experience

Use prebuilt MQ Advanced containers with resilience and security-rich features provided. Benefit from a simplified administration experience by using IBM MQ Operator.

Get ahead with MQ Advanced

With the average cost of a data breach hitting USD 3.86 million globally⁹, businesses that move a lot of highly sensitive information need the powerful features of MQ Advanced. Where MQ protects data on the move, MQ Advanced extends those security features to protect data on the move and at rest — keeping messages encrypted while they’re stored in queues. It also lets you harness simple yet powerful high availability to protect data from unplanned outages. And it offers advanced blockchain coordination and file transfer capabilities that can help you modernize your infrastructure.

Product versions

Consider these other deployment options

IBM MQ Advanced

Get core IBM MQ functionality, with additional file transfer, end-to-end message data encryption and simplified high-availability capabilities.

IBM MQ Appliance

Get IBM MQ scalability and security features and a high-specification appliance’s simplicity, convenience and low total cost of ownership. It's ideal for clients consolidating their MQ estate.

IBM MQ for z/OS®

Use custom code designed for IBM z/OS to transfer data on the mainframe. Get the stability, reliability and security-rich messaging that can be used as the foundation of your business.

IBM MQ on Cloud

Deploy IBM MQ across clouds for a common messaging backbone. Gain assurance and peace of mind, while connecting to your existing on-premises MQ infrastructure.

Client stories

1-800-flowers

The e-commerce giant uses MQ to boost its brands’ synergies.

BNY Mellon

MQ helps ensure delivery of sensitive, transactional bank data.

Universitats

MQ safely connects medical data across applications and systems.

Busan Bank

MQ lets out-of-branch salespeople get data, upping productivity.

Which option is right for you?

Try IBM MQ on Cloud

Get up and running on MQ quickly wiht IBM MQ on Cloud. Get access to a queue manger in minutes with no infrastructure responsibilities and no downloads.

Try MQ on premises

Try the on-premises MQ solution for 90 days. Included are the latest MQ features, in addition to the full capabilities of MQ Advanced.

Go deeper into MQ

Discover a wealth of resources to help your organization get the most from MQ

Footnotes

¹ https://fortune.com/fortune500/2020/search (link resides outside ibm.com)

Mqs Services

² https://www.spglobal.com/marketintelligence/en/news-insights/latest-news-headlines/the-world-s-100-largest-banks-2020-57854079 (link resides outside ibm.com)

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³ https://www.bizvibe.com/blog/largest-manufacturing-companies (link resides outside ibm.com)

⁴ https://www.investopedia.com/articles/markets/030916/worlds-top-10-health-care-companies-unh-mdt.asp (link resides outside ibm.com) Casino morongo sunday brunch.

⁵ https://nrf.com/blog/2020-top-50-global-retailers (link resides outside ibm.com)

⁶ https://www.statista.com/statistics/246347/the-largest-airline-worldwide-by-revenue (link resides outside ibm.com)

⁷ https://www.investopedia.com/articles/personal-finance/010715/worlds-top-10-insurance-companies.asp (link resides outside ibm.com)

⁸ https://www.the-next-tech.com/top-10/top-10-largest-it-service-provider-companies-in-the-world (link resides outside ibm.com)

⁹ Ponemon Institute, 2018 Cost of Data Breach Study: Impact of Business Continuity Management, October 2018; https://www.ibm.com/downloads/cas/4DNXZYWK (PDF, 3 MB)