What is the difference between asynchronous and synchronous

Synchronous Transmission sends data in the form of blocks or frames while Asynchronous Transmission send data in the form of character or byte. Synchronous Transmission is fast. On the other hand, Asynchronous transmission method is slow. Synchronous Transmission is costly whereas Asynchronous Transmission is economical.

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Dev Zone Asynchronous vs. Asynchronous vs. When to Use Asynchronous Programming As I said in the beginning, asynchronous execution is not the best scenario for all use cases. Something like this: In this challenge, we have the portal that policyholders or other entities use to insert and manage claim information.

OutSystems Asynchronous Capabilities OutSystems is a modern, AI-powered application platform that offers several in-built asynchronous capabilities: Timers: Timers are meant to perform routine tasks like sending emails that are scheduled on a daily basis like a digest but also long and heavy processing tasks. If you want to prep data to use after publishing an app, you can also use timers to perform bootstrap logic and they are also recommended to process large chunks of information that take some time to execute min.

BPT performs system-to-systems and human-to-systems interactions. It also supports business workflows and is able to perform multiple activities per process. Those activities can be automatic or human activities. Light Processes: Light processes are event-driven processes. You can think of them as triggers.

Light processes are meant to handle several thousand events per day, like as event brokers that require scalable database queuing. Compared with BPT, they only support one activity inside each process and it must be an automatic activity.

In addition to that, there are a few other capabilities important to note: Retry on error: If an error happens, timers and processes will retry up to three times. Timeout protection: Timeout protection prevents a background process to run infinitely, allowing resources usage control. Queue management: Queues are managed automatically by the platform, removing the need to worry about queuing background processes.

This provides you an additional layer of security. Once the bucket control is created, then a light process is triggered. And the triggering is going to execute the process. So an asynchronous task is not co-coordinated with other tasks, whereas a synchronous task IS co-coordinated with other tasks, so one finishes before another starts.

Synchronous means queue way execution one by one task will be executed. Suppose there is only vehicle that need to be share among friend to reach their destination one by one vehicle will be share. In asynchronous case each friend can get rented vehicle and reach its destination. Yes synchronous means at the same time, literally, it means doing work all together.

Whereas asynchronous means where processes don't work together, they may work at the same time if are on multithread , but work independently. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asynchronous vs synchronous execution, what is the main difference? Asked 12 years, 7 months ago. Active 2 months ago. Viewed 1.

Improve this question. Ankit Mishra 6 6 silver badges 15 15 bronze badges. I used to confuse both terms, and the way I did to remember the difference is throw the first "A" in " A JAX" which stands for asynchronous, in JavaScript when you do requests with AJAX in a loop they don't wait for each others or block the process, because the browser doesn't want to impact the user experience with a frozen website, all requests are sent almost at the same time without waiting the response of the previous request.

Well, I don't think the answers explain the original motivation for the terminology. But here's my take from what I came to know so far: synchronous - act based on a point of time, like the end of a timeout. However, the meaning of 'synchronous' is being twisted in this particular context. This would be a nice question for the Software Engineering site, isn't it?

Add a comment. Active Oldest Votes. Improve this answer. MeanwhileInHell 5, 14 14 gold badges 50 50 silver badges 87 87 bronze badges. Adam Robinson Adam Robinson k 31 31 gold badges silver badges bronze badges. What absolutely confuses me is that synchronous means "at the same time", yet when used in the sense above, it means sequential , and asynchronous means "not at the same time"??

Can somebody explain this conflict? Zenph: In this context, an entire block of code is what we're concerned with. Synchronous means that the block is executed at the same time though, yes, the components are executed sequentially.

Asynchronous means that the block is not all executed at the same time. In this case, the asynchronous call doesn't involve multithread programming or handling concurrency at the OS level. Oddly enough "Synchronously" means "using the same clock" so when two instructions are synchronous they use the same clock and must happen one after the other. That's why it looks backwards, the term is not referring to the instructions relationship to each other.

It's referring to each instructions relationship to the clock. Hope that helps. The terms come from engineering. Show 14 more comments. Charles Bretana Charles Bretana k 22 22 gold badges silver badges bronze badges.

Maybe the nomenclature is based on whether initiation of tasks is "synchronized" with completion of other tasks? MuhammadUmer: in computer world, occurring at the same time is called concurrency. IMHO, these pictures do not all describe the synchronous vs asycnhronous execution of tasks For example, the second picture implies that asynchronous tasks require several threads.

Actually, it does not. And that tasks have to run in parallel, which is not a requirement as well. Or, the picture for "synchronous" very well shows how tasks have been asynchronously dispatched form some call-site and now execute in a serial task scheduler ; IMO, the pictures are misleading. Show 24 more comments. Ryan 1 1 gold badge 9 9 silver badges 17 17 bronze badges.

If someone wants apples compared with apples; if you wanted the restaurant scenario to be synchronous, then when you order food, everyone else in the restaurant would have to wait for your food to arrive before they can order their food etc.

Now this seems like a really dumb scenario to be in, but in the computing world this scenario could be useful. Say each customer cant decide what they want, and instead want to look at what the previous customer orders to decide if they want that or not, then it makes sense that they have to wait for the food to arrive before ordering. Just to add on But that is not mandatory at all. To push your example even further, they could consider several gates for selling tickets.

Therefore, each line can work asynchronously from the other line but synchronously within itself! Fonix: I'll have what she's having! Synchronous Execution My boss is a busy man. Asynchronous Execution The boss tells me to do it, and rather than waiting right there for my work, the boss goes off and does other tasks. BenKoshy BenKoshy I'm DONE Synchronous work with 1 hand at a time. Asynchronous work with 2 hands at a time. Jimi 7 7 silver badges 11 11 bronze badges.

Reed Copsey Reed Copsey k 72 72 gold badges silver badges bronze badges. Reed Copsey Thanks for such a good explanation Just wanted some more info on Async-Exec Based on your answer in Async Exec So all A,B, C, D starts at a time So does B will only finish after A finishes , and C after B and so on Or can B first finish and then A can finish? Devrath The operations can finish in any order. DineshSaini - My diagram is slightly different. Charles Bretana's diagram places the synchronous processes in sequence without "syncing" anything.

I was going to comment below his answer to "improve" it, but realized it would be easier just to show the new diagram. Great diagrams. I think the way to call the top one SYNC, is that the start and end of A in the top diagram are effectively at the same time, in the sense that no other events have intervened, or could have interfered with A's completion.

Sync can refer to a single task in isolation, like adding to CPU registers, whose start and end are so close, as to effectively be actually dictionary-synchronous. WriteLine "Before call" ; doSomething ; Console. Ragoczy Ragoczy 2, 1 1 gold badge 17 17 silver badges 17 17 bronze badges. Sync vs Async Sync and async operations are about execution order a next task in relation to the current task Let's take a look at example where Task 2 is current task and Task 3 is a next task.

Task is an atomic operation - method call in a stack method frame Synchronous - implies that tasks will be executed one by one. UI is not responsive. Callback hell. The diagram in the synchronous multi-threaded example appears to depict concurrently executing threads?

The x-axis is conventionally used as a spacial dimension; the t-axis for time - an important distinction found in the analysis of algorithm complexity. I think this is bit round-about explanation but still it clarifies using real life example.

Small Example: Let's say playing an audio involves three steps: Getting the compressed song from harddisk Decompress the audio.