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New Post 9/4/2010 10:08 AM
Unresolved
User is offline random
5 posts
10th Level Poster


Asynchronous 

 Hi

Can anyone explain what asynchronous is? iis it dependent on another program/job running?

 

Thanks!

 
New Post 9/4/2010 9:04 PM
User is offline Tony Markos
493 posts
5th Level Poster


Re: Asynchronous 

Hi:

Manual or automated systems, especially larger scale systems, at the big picture level are asynchronous.   This means that high level- processes can occur in any order - there is no identifiable sequence.  The asynchronous nature of systems is one of the foundations upon which data flow diagrams are based. 

Tony

 

 

 
New Post 9/5/2010 12:56 AM
User is offline Adrian M.
765 posts
3rd Level Poster




Re: Asynchronous 

 collinsc wrote

Can anyone explain what asynchronous is? iis it dependent on another program/job running?

First the let's give the dictionary definitions (from Merriam-Webster) of both synchronous (since it's the opposite of asynch) and asynchronous:

Definition of SYNCHRONOUS
1: happening, existing, or arising at precisely the same time
2: recurring or operating at exactly the same periods

Definition of ASYNCHRONOUS
1: not synchronous
2: of, used in, or being digital communication (as between computers) in which there is no timing requirement for transmission and in which the start of each character is individually signaled by the transmitting device

And to answer your second question, if the term asynchronous is used then it means the "thing" you're referring to is NOT dependent on another program or job.

In IT and application development, the two terms are used in many different types of situations and it may have slightly different meanings.

For examples, if you refer to two activities, they are considered synchronous if they occur at the same time and asynchronous if they don't have to occur at the same time.

Here's another example: if an application is calling an external service (let's say a web service) the call may be referred to as synchronous  if the application waits for a response from the service before continuing its processing.  On the other hand, if the application does not wait for the response (it may check it later) then the call is considered to be asynchronous.

Hope this helps!

Do you have a specific example in mind that you had in question?

Adrian


Adrian Marchis
Business Analyst Community Blog - Post your thoughts!
 
New Post 10/23/2010 4:00 AM
User is offline random
5 posts
10th Level Poster


Re: Asynchronous 

 thanks for responses. adrian, thanks, no, no particular example.

 
New Post 10/23/2010 9:35 AM
User is offline Adrian M.
765 posts
3rd Level Poster




Re: Asynchronous 

 collinsc wrote

 thanks for responses.

You're very welcome!

Here's also a visual explanation:

Humor: Technical terms can be confusing: What is the difference between Synchronous and Asynchronous?


Adrian Marchis
Business Analyst Community Blog - Post your thoughts!
 
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