difference between call transaction and session method and which method is

[Former Member]

Hi ,

Can you tell which method is best...and the differences b/w Call Transaction and Session methods

[Former Member]

Hi,

CLASSICAL BATCH INPUT (Session Method)

CALL TRANSACTION

BATCH INPUT METHOD:

This method is also called as ‘CLASSICAL METHOD’.

Features:

Asynchronous processing.

Synchronous Processing in database update.

Transfer data for more than one transaction.

Batch input processing log will be generated.

During processing, no transaction is started until the previous transaction has been written to the database.

CALL TRANSACTION METHOD :

This is another method to transfer data from the legacy system.

Features:

Synchronous processing. The system performs a database commit immediately before and after the CALL TRANSACTION USING statement.

Updating the database can be either synchronous or asynchronous. The program specifies the update type.

Transfer data for a single transaction.

Transfers data for a sequence of dialog screens.

No batch input processing log is generated.

http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm

Among the two methods call transaction is better compared to session bcoz data transfer is faster in it.

Regards,

Priyanka.

[Former Member]

Hi shashidar,

Differences between call transaction and session.

Session Method:

1) Data is not updated in the database table until the session is processed.

2) No sy-subrc is returned.

3) Error log is created for error records.

4) Updation is always synchronous.

Call Transaction Method:

1) Immediate updation in the database table.

2) sy-subrc is returned.

3)Error need to be handled explicitly.

4) updation can be synchronous as well as asynchronous.

2) ya u can use using the N mode no screen.

3)u can't handle multiple transaction in call transaction.

4) u can handle multiple transaction in session using the BDC_INSERT fm.

5)When u go to SM35 u can able to see the error records.

Which is best?

That depends on your requirement. Both of them have there advantages.

According to the situation u can choose any one of these.

Regards...

Arun.

Reward points if useful.

[sonu_p2]

Hi Sashi,

<b>difference between batch input and call transaction in BDC Session method.</b>

1) synchronous processing.

2) can tranfer large amount of data.

3) processing is slower.

4) error log is created

5) data is not updated until session is processed.

Call transaction.

1) asynchronous processing

2) can transfer small amount of data

3) processing is faster.

4) errors need to be handled explicitly

5) data is updated automatically

For <b>session method,</b>these are the function modules to b used.

BDC_OPEN_GROUP

BDC_INSERT

BDC_CLOSE_GROUP

For <b>call transaction</b>,this is the syntax.

CALL TRANSACTION TCODE USING BDCDATA

MODE A or E or N

UPDATE A or S

MESSAGES INTO MESSTAB.

Take a scenario where we need to post documents in FB01 and the input file has say 2000 records (2000 documents, not line items in FB01 but 2000 records)

<b>In the BDC call transaction method</b>

We call the transaction FB01 2000 times (once for each record posting) and if the processing fails in record no 3 it can be captured and start with reocord 4.

Eg: Loop at itab.

call transaction FB01

capture errors

endloop.

<b>In the session method.</b>

We do not explicity call the transaction 2000 times, but all the records are appeneded into a session and this session is stored. The processinf of the session is done wwhenever the user wants it to be done. Hence the errors cannot be captured in the program itself

Check these link:

http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm

http://www.sap-img.com/abap/question-about-bdc-program.htm

http://www.itcserver.com/blog/2006/06/30/batch-input-vs-call-transaction/

http://www.planetsap.com/bdc_main_page.htm

<b>Reward points if helpful :-)</b>

Thanks,

Sachin

[Former Member]

OK