Session Method

[Former Member]

Hi All,

What is the difference/means what between session method and call

transaction methods?

Thanks & Regards,

<b>Anil Kumar</b>

[Former Member]

Hi Anil Kumar,

Hi,

Session method.

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

Session method is to populate the data by filling BDC structure and keep as session to process from SM37 to post in appropriate Transaction.

Call transaction method is to post the data directly into the Transaction from an Executable program.

Session method SAP defined Function modules.

U can see more help on the differences in the SAP help.

also 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

Pls reward points if helpful

Lijo Joseph

[Former Member]

Hi,

Call Transaction:

Speed.

Synchronous process.

SYnc. and Async both update possible.

Error handling thro Message structure BDCMSGCOLL.

Single Transaction.

Batch Input Session:

Slow.

Asynchronous process.

SYnc. update possible.

Error log is created in the SM35.

Multiple Transaction possible.

Direct Input.

Without calling the screens but all the validations should be done and only for master datas upload.

Direct Input method:

1. Only for error free datas and also master data

updation.

2. It will directly updates the database table. No

screens involved.

3. Transaction BMVO or Program RBMVSHOW has been

used.

BDC(Batch Input Session):

1. Screens will be called programmatically.

2. First sessions will be created then we'll run the seesions in SM35 transaction.

3.Synchronous database update. After the processing the session only database update will occur.

BDC:

Batch Data Communication (BDC) is the process of transferring data from one SAP System to another SAP system or from a

non-SAP system to SAP System.

Features :

BDC is an automatic procedure.

This method is used to transfer large amount of data that is available in electronic medium.

BDC can be used primarily when installing the SAP system and when transferring data from a legacy system (external

system).

BDC uses normal transaction codes to transfer data.

Types of BDC :

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.

Differences between Call Transaction and Sessions Method:

Session method.

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.

6) generally used for back ground jobs.

7) at atime we can update to more than one screens.

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

6) for background n fore ground jobs.

7) at atime we can update to a single screen.

Direct Input method:

Without calling the screens but all the validations should be done and only for master datas upload.

1. Only for error free datas and also master data updation.

2. It will directly updates the database table. No screens involved.

3. Transaction BMVO or Program RBMVSHOW has been used.

For BDC:

http://myweb.dal.ca/hchinni/sap/bdc_home.htm

https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/bdc&;

http://www.sap-img.com/abap/learning-bdc-programming.htm

http://www.sapdevelopment.co.uk/bdc/bdchome.htm

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

http://help.sap.com/saphelp_47x200/helpdata/en/69/c250684ba111d189750000e8322d00/frameset.htm

http://www.sapbrain.com/TUTORIALS/TECHNICAL/BDC_tutorial.html

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

Refer

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

Check these Links out

BDC does a CALL TRANSACTION. So each and every case (document, master data,...) is committed to the database on commit. The commit occurs after completion of the transaction.

Direct input will commit the data to the database when the commit is requested explicitly.

During BDC and direct input relevant DB tables are locked, they can not be updated by other processes. After commit they are unlocked.

Thus a program using direct input must care for intermittent commits to avoid an overflow of the lock tables. For master data, a lock table overflow may occur for more than (roughly) 2000 cases.

Although direct input does not do any screen input, the same routines are passed as BDC with (simulated) screen input

some more...

Call Transaction:

Speed.

Synchronous process.

SYnc. and Async both update possible.

Error handling thro Message structure BDCMSGCOLL.

Single Transaction

Thanks

Naveen khan

[varma_narayana]

Hi Anil

The main diff:

1. Session method processes in two steps i.e Generate session and Process session.

Where as CT is one step.

2. Session method generates error log but not CT method.

3. CT method returns SY-SUBRC and Messages which is not in Session .. This is very imp..

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