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Memory Management
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 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 workareas 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.
How do you write a DATA object from ABAP/4 program to ABAP/4 memory and
restore the same from memory to program.
EXPORT <f1> [FROM <g1>] <f2> [FROM <g2>] ... TO MEMORY ID <key>.
The ID <key>, which can be up to 32 characters long, identifies the data in memory.
Statement used to delete data objects in ABAP/4 memory.
FREE MEMORY [ID <key>].
How will you create a file on application server
Open dataset <dsn> for output.
ABAP/4 statement for opening a file on application server for reading
___________.
Open dataset <dsn> for input.
How will you transfer data into a file in application server ?
Data fname(60) value 'mYFILE'.
Data num type i.
Open dataset fname for output.
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