topic Data Transfer in Application Development and Automation Discussions

Data Transfer

Former Member — Tue, 14 Nov 2006 12:21:51 GMT

Hi friends,

in an interview i was asked the following

1. when we have to use BDC,LSMW,BAPI

2. Which is the hardware r u using

3. which dynpro r u using

Re: Data Transfer

Former Member — Tue, 14 Nov 2006 12:24:41 GMT

LSMW can import data from legacy systems (e.g. in the form of Excel sheets or CSV files). For this, I guess, LSMW converts your data into batch input files automatically. If you use BDC, on the other hand, you have to write your batch input file yourself, line per line.

BDC (Batch Data Communication) is a technology used for data transfer. it is meant for transferring data thru SAP transactions itself. when u use BDC for data transfer, the sequence of steps is the same as when u use standard sap transaction screens for data upload. the only difference is that u can use different options for foreground/background processing.

LSMW on the other hand is a tool that helps migrate data from a legacy system (non-sap system ) to SAP system. it offers u various options to use either batch input, direct input, BAPIs or idocs. it involves a series of some 17-18 steps to migrate data.

http://www.sap-img.com/sap-data-migration.htm

BAPI is based on OOPs concept. BAPI is a set of interfaces to object-oriented programming methods that enable a programmer to integrate third-party software into the proprietary R/3 product from SAP. For specific business tasks such as uploading transactional data, BAPIs are implemented and stored in the R/3 system as remote function call (RFC) modules.

http://help.sap.com/saphelp_nw04/helpdata/en/e0/9eb2370f9cbe68e10000009b38f8cf/frameset.htm

I hope it helps.

Best Regards,

Vibha

*Please mark all the helpful answers

Re: Data Transfer

Former Member — Tue, 14 Nov 2006 12:26:52 GMT

1) All the three are used in case of migrating the data from a Legacy System into SAP system.

more specifically BDC -Call Transaction method is used for <10000 records, BDC session for more than 10000 records.

LSMW is a one stop transaction where you can define the steps in uploading the legacy data into sap. The lsmw is a toll which can use any one of Direct Input, BDC, BAPI or IDOc methods od data transfer into SAP.

2) ??? Do you mean database? SAP almost supports all databases eg: ORACLE.

3) This is very vague. a Dynpro is another name for screen. The question doesn't make any sense to me.

Regards,

Ravi

Re: Data Transfer

anversha_s — Tue, 14 Nov 2006 12:28:39 GMT

hi,

LSMW:

The Data Transfer Workbench (or DX Workbench, transaction SXDA) is an integrated SAP tool that supports data transfer and analysis.

It does not have the built-in features for mapping for source structures to target structures,

but it will allow you to integrate Legacy System Migration Workbench (LSMW) objects as processing tasks within a run definition.

The DX workbench has many features for creating test data and performing data migrations - for example, logging of data migration runs.

However, if you need to map or convert data, you should use the LSMW.

Or, you can integrate your LSMW objects as task within a more user-friendly data migration run, in which the LSMW project steps "Read data", "Convert data," and "Start IDoc processing" are automated and use the features of both tools. If you donot need logging and automated data migration runs, you can perform your data migration without the DX Workbench.

BDC:

Batch Data Communication (BDC) is the oldest batch interfacing technique that SAP provided since the early versions of R/3. BDC is not a typical integration tool, in the sense that, it can be only be used for uploading data into R/3 and so it is not bi-directional. BDC works on the principle of simulating user input for transactional screen, via an ABAP program. Typically the input comes in the form of a flat file. The ABAP program reads this file and formats the input data screen by screen into an internal table (BDCDATA). The transaction is then started using this internal table as the input and executed.

Check this thread

Regards

Anver

<i>the other 2 questions are strange</i>