topic Re: In interview Quation in Application Development and Automation Discussions

In interview Quation

Former Member — Mon, 14 May 2007 06:54:29 GMT

When will you decide in BDC which method should we use? why

please help .

With regards,

satya

Re: In interview Quation

Former Member — Mon, 14 May 2007 07:01:30 GMT

Hi,

There are three methods for BDC:

1. Session methon

2. Call transaction method

3. Dialog method : this is oblolete method now so not considered.

In general, Session method is slow but consistent and used for huge data upload. Call transction method is fast but will not perform as consitant as session method for huge data upload.

Also see few differences as follows:

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. in session method, no sy-subrc is returned due to the basic characteristic of session method. 'Call transaction' always returns Sy-subrc.

Hope this will help you.

Jogdand M B

Re: In interview Quation

Former Member — Mon, 14 May 2007 09:03:56 GMT

Hi,

Suppose we want to upload the data only one time and we never use to upload then at that time we have to go for LSMW. We want to upload the data frequently then we have to go for Call transaction or Session method. In that the records to upload is low then call transaction is useful. And the data we have to upload is very large then we have to chose Session method.

Thanks

Ravi

Re: In interview Quation

Former Member — Mon, 14 May 2007 10:58:02 GMT

Hi satya.

there is one more method called DIRECT INPUT METHOD in this method it does not process the screen but directly updates the database tables these are sap standerd data transfer program

ex: RMDATIND Transfer Material Master Data by Direct Input.

as for your question is concerned.

if you have very less data to be uploded and quickly or on line you can go for

Call Transaction method(on line) sycronous process here you have your program take care of error because no error log is created.

if you want to shedule the program and you have very large amount of data to be uploded

you can go for session method/batch Input(asyncronus process) which can be sheduled for later period when there is less load on the system and Can be planned and submitted in the background.

Why go for session method/batch Input ?

To Create Master Data

To move data from legacy System and replace Legacy system with SAP

To develop interface with legacy system using flat file

Rules For Batch Input

Data should be checked and validated before being transferred into the SAP system

Therefore Data should be entered through online Program or Transaction which we know has got automatic Validation and programmed validation.

Thanks and Regards,

Pavankumar

Re: In interview Quation

Former Member — Wed, 16 May 2007 07:01:59 GMT

Hi Pavankumar,

Thanks for helping

regards,

satya

Re: In interview Quation

Former Member — Wed, 16 May 2007 07:02:56 GMT

Hi ravi,

Thanks a lot

regards,

satya

Re: In interview Quation

Former Member — Wed, 16 May 2007 07:06:20 GMT

Hi Jogdand,

Thanks for useful answer.

regards,

satya