LSMW is used for migrating data from a legacy system to SAP system, or from one SAP system to another.
Apart from standard batch/direct input and recordings, BAPI and IDocs are available as additional import methods for processing the legacy data.
The LSMW comprises the following main steps:
How is the decision made which method should be followed? What is the procedure followed for this analysis?
All the 3 methods are used to migrate data. Selection of these methods
depends on the scenario, amount of data need to transfer. LSMW is a ready
tool provided by SAP and you have to follow some 17 steps to migrate master
data. While in BDCs Session method is the better choice because of some
advantages over call transaction. But call transaction is also very useful
to do immediate updation of small amout of data. (In call transaction developer
has to handle errors).
These methods are chosen completely based on situation you are in. Direct input method is not available for all scenario, else, they are the simplest ones. In batch input method ,you need to do recording for the transaction concerned. Similarly, IDoc, and BAPI are there, and use of these need to be decided based on the requirement.
Try to go through the some material on these four methods, and implement them. You will then have a fair idea about when to use which.
Explain the exact difference between lsmw & bdc.
BDC- It is Batch data communication. Its used for data conversion from legacy system to SAP system. Only technical people can do it. Tcode is SHDB.
LSMW- It is legacy system migration workbench. Its also used for data conversion from legacy system to SAP system. But it is role of functional consultant.
There are 14 steps in LSMW. As soon as you complete the one step, automatically it will go to next step.
In general you can use LSMW. But if you want to transfer more than 40,000 data, then it is not possible in LSMW. That time you can take help of BDC. *-- Purnimarani Satapathy
SAP Data Migration Reference Book
Migrating SAP Data Tips
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