SAP R/3- ERP Application is for Integrating and managing business process.Ex:Managing h/w resources,s/w resources and others,Manages Company info & controls companys business process.
SAP-Architecuture:
1.Presentation Layer
2.Application Layer
3.Database Layer
Presentation Layer: User interacts with T-codes .
*we need reports,we give id,we get the reports.we can specify product details and get details.
Two types of INTERFACES(users):
*SAP GUI-for .exe
*SAP GUI- for HTML
Application Layer: Excutes the user requests.
Its has two components-
1.Work Process.
2.Dispatcher.
Work Process : Program to perform specific task,task like any logical operation,Application layer uses work process.To generate report we had to print for that we need spool and dialog work process.
Dispatcher: It manages work process,Checks what type of requests sent and what types work process are available.Store them in request queue
Types of Work Process:
Dialog Work Process: Interactive process,It send requests to database and gives response to users.
Background Work Process: Excutes ABAP programs in R/3,Non Interactive process.
Enqueue Work Process: It manages simultaneously database by mulitple application servers.
Message: It facilitates transfer of data and internal message between various application servers.
Spool Work Process:It manages printing requests,it contains information about printers and formats.
Update Work Process : It is responsible for updating database,it is receives and updates requests generated by Dialog and Background work process.
Gateway: It facilitates communication among R2 and R3 system and external application.It is used for large amount of data
Database Layer: This layer stores system data and new data(user input to SAP GUI) and provides to data to application layer when requested.
SAP-Architecuture:
How Sap process Requests:
Three Layers of SAP:1.Presentation Layer
2.Application Layer
3.Database Layer
Presentation Layer: User interacts with T-codes .
*we need reports,we give id,we get the reports.we can specify product details and get details.
Two types of INTERFACES(users):
*SAP GUI-for .exe
*SAP GUI- for HTML
Application Layer: Excutes the user requests.
Its has two components-
1.Work Process.
2.Dispatcher.
Work Process : Program to perform specific task,task like any logical operation,Application layer uses work process.To generate report we had to print for that we need spool and dialog work process.
Dispatcher: It manages work process,Checks what type of requests sent and what types work process are available.Store them in request queue
Types of Work Process:
Dialog Work Process: Interactive process,It send requests to database and gives response to users.
Background Work Process: Excutes ABAP programs in R/3,Non Interactive process.
Enqueue Work Process: It manages simultaneously database by mulitple application servers.
Message: It facilitates transfer of data and internal message between various application servers.
Spool Work Process:It manages printing requests,it contains information about printers and formats.
Update Work Process : It is responsible for updating database,it is receives and updates requests generated by Dialog and Background work process.
Gateway: It facilitates communication among R2 and R3 system and external application.It is used for large amount of data
Database Layer: This layer stores system data and new data(user input to SAP GUI) and provides to data to application layer when requested.
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