SAP R/3 форум ABAP консультантов

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Q. What is a Working Process
A. Work processes are components of ABAP Application servers.Work process execute the individual dialog steps of ABAP application programs.

Work process contains three important components.
They are
1. Screen Processor
2. ABAP Processor
3. Database Interface

1. Screen Processor:
It executes Screen flow logic via dispatcher.
It takes over the responsibility for communication between
the work process and sap gui.
2. ABAP Processor
It executes the processing logic of application program.
It communicates with the database Interface.
3. Database Interface
It creates and destroy the link between work process and
database.
It provides access to ABAP Programs and ABAP Dictionary
It manages the buffer administration on application server.
It control transatcions using COMMIT and rollback.

There are 5 types of work processes.
1.Dialog Work Process
Dialog work processes deal with requests from an active
user to execute dialog steps.

2.Update Work Process
It execute database update requests.
Update requests are part of an SAP LUW that bundle the
database operations resulting from the dialog in a database
LUW for processing in the background.

3.Background Work Process
Background work processes process programs that can be
executed without user interaction .

4.Enqueue Work Process
It manages lock tables in the shared memory area.
This mechanism is used to prevent the concurrent access
of same data.
A single enqueue work process is sufficient to perform the
required tasks.

5. Spool Work Process
It is used to perform print jobs.
Each ABAP application server may contain only one spool
work process.