Answer Posted / mahender achhe

LSMW : Legacy System Migration Workbench.
BDC : Batch Data Communication.
LSMW : It is used for migrating the data b/w the Non-SAP
and SAP application to do for that we can take the Non-SAP
application data and Converts the data into the Legacy data.
(Legacy data means Cleansing data and Purging the data
After the Legacy data creation convert the data in to
the "Flat file". That flat file is in the form of text file
or excel format.If the file is in the form of text format
we can create the ".txt" file ("ABC.txt")and in the form of
excel ".xls" file is created. flat file for dos and .xls
file for IBM.
The converted file (.txt/.xls)is either upload or download.
The Upload functionality if used for .txt file to SAP and
where as Downloading is the concept while SAP to .txt/.xls
file.
BDC : It is also used for migrating the b/w the non-sap to
sap applicatios.

in lsmw below 5000 records are updating or inserting
purpose we can use the lsmw.but where as above 5000 records
are uploaded we can use BDC.

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