Overview of a SAP Basis

Overview
SAP Basis Functions

Learning Objective

What the Basis system ?

How does SAP handle a transaction request?

Differentiating between the various work processes?

Understanding the basic functions of the Basis Module?


 

This slide depicts how an application server works.  Users make requests at the presentation layer and through TCP/IP these requests get sent to the application server.  The dispatcher then takes the requests and assign them to work processes which handle the requests.  More detailed explanations are on the following slides.

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The dispatcher is a program which manages the resources of the R/3 applications.  They are very similar to a police dispatcher who receives requests via 911 and routes it to available officers who are in the area.

 

 

 

The dispatcher receives requests from the many users on the system and passes them along to the corresponding work processes which are free.  It also manages the information flow between the app server and the SAPGUI.

 

 

 

Each app server has only one dispatcher because it could get kind of difficult for two dispatchers to route requests to the work processes. 

 

The dispatcher is responsible for balancing the workload between the work processes so that processes don’t sit idle.

 

Memory management is also one of its duties.  The dispatcher must also organize the communication between the work processes and also between the SAPGUI and app server.

 

Work processes are the actual programs which execute tasks.  They update the database, run batch programs, and send messages.  Work processes are comprised of a task handler, an ABAP/4 processor, dialog interpreter and database interface.

They execute dialog steps for a user and typically only do the work of displaying one screen at a time.  In other words, work processes present one screen of data, and are immediately freed to handle other tasks.  The next screen is then handled by the next available work process.

 

The task handler coordinates the activities of the work process.  The database interface allows for the work process to directly access the database.  The dialog interpreter is used to coordinate presentation information and the ABAP/4 processor is useful when running programs.

 

There are seven different types of work processes which will be described in detail in the following slides.  The five work processes in the middle around the dispatcher are the main work processes in use in the application servers.  The two work processes on the outside are used for communication methods within the systems.

The dialog work process is typically the most common work process.  It handles all the interactive requests of the R/3 system.  Any time a user sends a request the dialog work process plays a part in the work.  Dialog work processes handle just one dialog step and are immediately freed to handle other requests.  So these work processes are constantly switching between users.  This limits the number of dialog work processes, as you would need the same number of work processes as users otherwise.


 

Background work processes execute long running and CPU intensive programs which are required to be run.  Some examples include client copies and long listing reports.

 

Background jobs can also be set to run at specific times.

 

In charge of formatting data for printing and sending it to the host spool system.  Only one spool work process per host.

In order to ensure the integrity of the database, the enqueue work process is responsible for the lock management system.  There is only one enqueue work process per system as it synchronizes the data access for multiple application servers and work processes.  When a work process is accessing data for possible manipulation it is locked so that other work processes cannot access the data until it is released. 


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Tech Hunt(Rules and Regulations)

This is the page for tech hunt rules and regulation

1.It’s simple guys relate the set of images given and enter the answer in text box given below .

2.If your answer is correct it will move to the second page or else it will remain in the same page without giving any prompt.

3:All the string that you enter in the text box provided for answer need to be in small letters and no spaces required between words .

4.Don’t give partial answer’s (For eg: If answer is “windowsxp” , don’t enter the string as “windows”).

5.There are totally 8 questions  to be solved and complexity level increases by each level .

6.Once you complete 8 levels you will be in HALL OF FAME :) .

If any queries regarding the event please do post the comment . We will reply as soon as we can . Cheers!!! :D .

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Tech Hunt

This is a page for tech hunt partipant

1.First Question hint

We are missing something very badly in our Google home page :) .

2.Second Question hint

Rishte me toh hum tumhare baap lagte hai,Naam hai shahenshah :D.

Hint2

Hint2

3.Third Question hint

An apple a day keeps a doctor away and helps you concentrate .

4:Four Question hint

His first job position was at IIM Ahmedabad . 

5:Fifth Question hint

Jobless

Jobless

6:Sixth Question hint

“Now lets clone the pac-man”

 

     I will be posting hints regularly in this blog.

ALL THE BEST GUYS.

5 thoughts on “Tech Hunt

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CON Mystery Solved .

CON Mystery Solved .

CON Mystery Solved .

There is lot of posts on social networking sites saying even Bill Gates does have answer for this question “Why can’t you create a folder named CON in Windows or MS-DOS?” . If the creator and founder of Microsoft doesn’t know about this who else will know ? . Answer is simple for a Computer Geek and Who cant get what does below post say you better think that it is not possible today and wont be possible in future too simple enough .

In MS-DOS, several special “device files” were available to aid in performing certain tasks, such as clearing the screen or deleting extraneous output from a program. In order to maintain backwards-compatibility, all versions of Windows up to and including Windows 7 will refuse to allow you to create a file with these “reserved” device file names. The following file names are reserved:

CON
PRN
AUX
NUL
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
LPT1
LPT2
LPT3
LPT4
LPT5
LPT6
LPT7
LPT8
LPT9

CON, incidentally, was a device file used to capture whatever was printed onscreen.

So no more stupid post about CON Folder . Mystery Solved . Bazingaaaaaaaaaaaaaaaaaaa.

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Do such love stories exist ???

Mr and Mrs Sharma Kya Mehruni Rang Ka sweater.
Beautiful....Makes me believe that love do exist!!!

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Pinked By Indian IT .

Story behind Indian IT Companies :

32, M here. lost my job, due to performance reasons (i think the reasons are different, but that is what they said). i used to work for one of the MRC companies. wife left me, because i have no job, and she is now with some guy working for Intel in UK. Kid is taken away from me. Got divorced (she did not claimed any money because she is very rich), I sold out all my possessions (except this laptop and a bike), gave away the money to parents and siblings and moved to a PG, living off working part-time job (i now work in a hotel - front office - the guy who leads you to your seats and looks over all the customer satisfaction things) . i used to draw 75K salary in IT, but now i am getting 20K. i have no hope of bettering my life, but i am trying to be happy with what i have now. Reddit and the local wine shop keeps me sane. I hate people and would like to live, not dealing with them any more (Walden like) but then i am not capable of it. I used to have dreams of making it big, doing something for the society, but the same society killed my affection and any good feelings i have towards it and myself. If i get to push the button of the N-bomb, i would not blink.

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Home

From poems to stories and From interesting codes to latest research .

Find everything in this blog .

Nerdo’s Plz stay away!!!

Geeks are always welcome .

I m Deepesh Shetty and this is my world.

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