Question related to Synchronous update

Hi, all
I have some question related to synchronous update:
1. What is the syntax if I want to write synchronous update.
Do i write as:
call funcition A in update task
commit work and wait
Or just
call function A (A declared as update type function )
commit work and wait
Or ...
2.If we use synchronous update, is VBHDR,VBDATA still filled the same way when using asynchronus update?
Thanks in advance,
Liming

Hi,
Why do we use this " In Update Task " ??
The main update technique for bundling database changes in a single
database LUW is to use CALL FUNCTION... IN UPDATE TASK.
How do we Use ??
A typical R/3 installation contains dialog work processes and at least one update work process. The update work processes are responsible for updating the database. When an ABAP program reaches a COMMIT WORK statement, any function modules from CALL FUNCTION... IN UPDATE TASK statements are released for processing in an update work process. The dialog process does not wait for the update to finish. This kind of update is called asynchronous update.
What is the Use... ??
Asynchronous update is useful when response time from the transaction is critical, and the database updates themselves are so complex that they justify the extra system load

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