Is there any issue in using ABAP Memory ID to exchange between the programs

Hi All,
Do we expect any issues if we use ABAP Memory ID's to exchange the data between different programs?
I was told by my colleagues that, we can expect some unforeseen issues if we use ABAP Memory ID's. These issues could be because of refresh of Memory ID's in the Standard program.
Is that true? Need experts opinion on this question.
Thanks a lot in advance.
Regards,
RSS

I can think of such case only if you pick memory id of some standard name. Anyhow I can't imagine this happens w/o running any standard report on you machine from your custom report. ABAP memory is user dependant so you have your own roll area wherein all run programs can communicate. If you don't run any standard report by means of SUBMIT, you don't have to worry about this aspect either.
Futhermore if you run separate GUI session, or sinmply use /o in same session, you open new external session which gets its own new ABAP memory. So you don't affect your previous one at all.
If you want to be extremely careful, use memory id of some custom, original name i.e. I always use such naming convention NAME_OF_PROGRAM_XXXX where XXX denotes its usage i.e. XXX = 'EMPLOYEES'. If I also don't use SUBMIT I am 100% sure no other program touches/flushes this memory.
Don't believe your collegues and use ABAP memory whenever needed, but always consider context of program and where it lies in the memory. If they persist, please send them here to discuss this matter giving some good reason why they discourage you to do.
BTW: This could be an issue with SAP Memory, but with ABAP no chance.
Regards
Marcin

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Futhermore if you run separate GUI session, or sinmply use /o in same session, you open new external session which gets its own new ABAP memory. So you don't affect your previous one at all.
If you want to be extremely careful, use memory id of some custom, original name i.e. I always use such naming convention NAME_OF_PROGRAM_XXXX where XXX denotes its usage i.e. XXX = 'EMPLOYEES'. If I also don't use SUBMIT I am 100% sure no other program touches/flushes this memory.
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BTW: This could be an issue with SAP Memory, but with ABAP no chance.
Regards
Marcin

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Hi,
How to pass data between two internal sessions using ABAP memory?
It would be fine if you could explain with an example.
And also let me clear about the data passing between two main sessions and two external sessions with specific examples.
Thanks.

Hi ,
check the example.
Reading Data Objects from Memory
To read data objects from ABAP memory into an ABAP program, use the following statement:
Syntax
IMPORT <f1> [TO <g 1>] <f 2> [TO <g 2>] ... FROM MEMORY ID <key>.
This statement reads the data objects specified in the list from a cluster in memory. If you do not use the TO <g i > option, the data object <f i > in memory is assigned to the data object in the program with the same name. If you do use the option, the data object <f i > is read from memory into the field <g i >. The name <key> identifies the cluster in memory. It may be up to 32 characters long.
You do not have to read all of the objects stored under a particular name <key>. You can restrict the number of objects by specifying their names. If the memory does not contain any objects under the name <key>, SY-SUBRC is set to 4. If, on the other hand, there is a data cluster in memory with the name <key>, SY-SUBRC is always 0, regardless of whether it contained the data object <f i >. If the cluster does not contain the data object <f i >, the target field remains unchanged.
In this statement, the system does not check whether the structure of the object in memory is compatible with the structure into which you are reading it. The data is transported bit by bit. If the structures are incompatible, the data in the target field may be incorrect.
PROGRAM SAPMZTS1.
DATA TEXT1(10) VALUE 'Exporting'.
DATA ITAB LIKE SBOOK OCCURS 10 WITH HEADER LINE.
DO 5 TIMES.
ITAB-BOOKID = 100 + SY-INDEX.
APPEND ITAB.
ENDDO.
EXPORT TEXT1
TEXT2 FROM 'Literal'
TO MEMORY ID 'text'.
EXPORT ITAB
TO MEMORY ID 'table'.
SUBMIT SAPMZTS2 AND RETURN.
SUBMIT SAPMZTS3.
The first part of this program is the same as the example in the section Saving Data Objects in Memory. In the example, the programs SAPMZTS1 and SAPMZTS2 are called using SUBMIT. You can create and maintain the programs called using the SUBMIT statement by double-clicking their names in the statement. For further information about the SUBMIT statement, refer to Calling Executable Programs (Reports)
Example for SAPMZTS2:
PROGRAM SAPMZTS2.
DATA: TEXT1(10),
TEXT3 LIKE TEXT1 VALUE 'Initial'.
IMPORT TEXT3 FROM MEMORY ID 'text'.
WRITE: / SY-SUBRC, TEXT3.
IMPORT TEXT2 TO TEXT1 FROM MEMORY ID 'text'.
WRITE: / SY-SUBRC, TEXT1.
Example for SAPMZTS3:
PROGRAM SAPMZTS3.
DATA JTAB LIKE SBOOK OCCURS 10 WITH HEADER LINE.
IMPORT ITAB TO JTAB FROM MEMORY ID 'table'.
LOOP AT JTAB.
WRITE / JTAB-BOOKID.
ENDLOOP.
The output is displayed on two successive screens. It looks like this:
and
The program SAPMZTS2 attempts to read a data object TEXT3 from the data cluster "text", which does not exist. TEXT3 therefore remains unchanged. The existing data object TEXT2 is placed in TEXT1. In both cases, SY-SUBRC is 0, since the cluster "text" contains data.
The program SAPMZTS3 reads the internal table ITAB from the cluster "table" into the internal table JTAB. Both tables have the same structure, namely that of the ABAP Dictionary table SBOOK.
Pls. reward if useful.....

Is there any issue in using ABAP Memory ID to exchange between the programs

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