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Describe Memory Management?

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Category: Basis
Published on Thursday, 11 October 2007 13:44
Written by Anon.
Hits: 23022
SAP memory (Global Memory) :- is available to a user during the entire duration of a terminal
session.  Its contents are retained across transaction boundaries as well as external and
internal sessions.

 External session :- When user logs on to R/3 system, the system creates a new terminal
session called external session.  E.g. System a Create Session.
Internal session :- created by calling a transaction (with CALL TRANSACTION), a dialog
module (with CALL DIALOG) or a report (with SUBMIT or RETURN).
For external session :- internal sessions are allowed
Roll area :- Data areas of used programs are created in roll areas for each internal session.
Posting data between internal sessions :-  EXPORT TO MEMORY and IMPORT FROM
MEMORY.
Main program group :- Created when exporting an internal session.
Additional program group :- If a function module belonging to a function group not so far
loaded, additional program group is created.
Subroutine call:- When external subroutine is called system loads the relevant program and
adds it to the program group of calling program.
Work areas :- Both table & common work areas with the same name are created once for each
program group and then shared by all programs in the group.
List system :- Consists of basic list and all details list belonging to basic list assigned to exactly
one screen level.
User interface :- Only program has its own user interface.  Internal sessions interface is initially
empty.  Special user interface has to be activated using SET PF-STATUS statement.
ABAP/4 memory :- Retained only during the lifetime of an external session.
Data cluster :- Group of several data objects.
Data objects :- Units of data, which a program processes at runtime.
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