Answer / nandy

LSMW and BDC are vastly different.
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/backgrou nd
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.

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.

LSMW:

The LSM Workbench is an R/3-based tool that supports You
when transferring data from non-SAP systems ("Legacy
Systems") to R/3 once or periodically.
The tool supports conversion of data of the legacy system in
a convenient way. The data can then be imported into the R/3
system via batch input, direct input, BAPIs or IDocs.
Furthermore, the LSM Workbench provides a recording function
that allows to generate a "data migration object" in an
entry or change transaction.

The main advantages of the LSM Workbench:
• Part of R/3 and thus independent of individual platforms
• A variety of technical possibilities of data conversion:
• Data consistency due to standard import techniques:
Batch input
Direct input
BAPIs (Business Application Programming Interfaces)
IDocs (Intermediate Documents)
The import technique to be used in an individual case
depends on the business object.
• Generation of the conversion program on the basis of
defined rules
• Clear interactive process guide
• Interface for data in spreadsheet format
• Creation of data migration objects on the basis of
recorded transactions
• Charge-free for SAP customers and SAP partners

i hope it is clear

plz do let me know, if any update.

regards

Govardan.

Answer / sainath

Advantages of BDC over LSMW:

1)LSMW is possible for standard tcodes only.whereas BDC is
possible for standard as well as custom tcodes.

2)Coding in BDC is easy(in ABAPer's point of view)

3)In LSMW upload the data through .txt file only
In BDC uploading can be through both .txt and .xls files

Answer / mutyapu thirupathi

in session method ,if you forgot session to keep live.then
sesession will be terminated this is disadvantage of using
session method. where as call transaction method data
transerfered automatically but disadvantage of it is u have
to handle errors mannually where as in lsmw is a tool to
transfer data no programming required.

please forgive if above answer is wrong and letme know
correct answer

Answer / micky-abap/4

lets discuss BDC
1)this is used for predefined as well as user defind data.
2)this method takes less momery .
3)this method is more relable then lsmw.
4)writing coding means we r mapping or matching our fields
with the reciver side structure fields...cz both ve to same.
lsmw
1) only pre defined
2) more memory cz calling all fields.
3) not relabile.

i m writing this ans as best of my knowedge..
tc .

Answer / muthukumaran

The difference between Bdc and Lsmw is that in LSMW we can
upload the master data only

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