lsmw use

[Former Member]

why r we using lsmw .compare with session.

[Former Member]

why r we using lsmw .compare with session.

[Former Member]

Hi,

BDC and LSMW are the two data migration techniques (from legacy to SAP) . BDC technique is usually done by ABAPers. It consists of three methods.

1) Call Dialog Method

2) Session Method

3) Call Transaction Method

In the case of Session Method , a BDC Session is created , which has the data and info to run it in batch mode. When the user runs this session, every transactions are run in batch mode and tables are updated.

WHile in call transaction, no session is created. Instead , a report prog is created , which takes input from the file and calls the transaction in Batch mode.

Call dialog method is similar to call transaction, except that updation is done by the calling program itself.This method is obsolete.

Advantages of Batch Input Method are

1)Can process large data volumes

2) data integrity is maintained

Just check these links.

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

BDC

http://myweb.dal.ca/hchinni/sap/bdc_home.htm

https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/bdc&;

http://www.sap-img.com/abap/learning-bdc-programming.htm

http://www.sapdevelopment.co.uk/bdc/bdchome.htm

http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm

http://help.sap.com/saphelp_47x200/helpdata/en/69/c250684ba111d189750000e8322d00/frameset.htm

http://www.sapbrain.com/TUTORIALS/TECHNICAL/BDC_tutorial.html

LSMW

http://help.sap.com/saphelp_nw04s/helpdata/en/87/f3ae74e68111d1b3ff006094b944c8/content.htm

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

http://www.scmexpertonline.com/downloads/SCM_LSMW_StepsOnWeb.doc

http://allsaplinks.com/lsmw.html

http://myweb.dal.ca/hchinni/sap/lsmw_home.htm

<b>Reward Points if Useful</b>

Regards

Gokul

<b>Close the Thread if your question is answered.</b>

[Former Member]

There are lot of advantages are there in LSMW compare with BDC session or call trasaction method.

If you are going for BDC you must have to do the recording to dop the BDC either session method or bastch input method , this will casuse many recording errors if you are going for more screens and more fields.

But LSMW itself prviding four wonderful methods to make our job so easier.

1.We have LSMW stadard Batchinput/Direct input for most of the master data convesrions

2. Business onject method using BAPI's

3. IDOC methods .

These are the three major procedures we use generally in LSMW , if suppose it is not possible for you to do by using any of these methods we go for LSMW recording mehtod.

LSMW method minimizes the code so as to complete the task in minimal time ..

We go for BDC when you have a requirement to load the data or commit the work online we go for BDC Call transaction method.

If there are table control while recording, it is always better to go for BDC session method.

Regards,

Rajesh.

[Former Member]

hi,

LSMW – Step by Step Guide: Legacy System Migration Workbench is an R/3 Based tool for data transfer from legacy to R/3 for one time or periodic transfer.

Basic technique is Import data from Spreadsheet / Sequential file, convert from source format to target format and import into R/3 database. LSMW not part of standard R/3,

Advantages of LSMW:

• Most of the functions are within R/3, hence platform independence.

• Quality and data consistency due to standard import techniques.

• Data mapping and conversion rules are reusable across projects.

• A variety of technical possibilities of data conversion.

• Generation of the conversion program on the basis of defined rules

• Interface for data in spreadsheet format.

• Creation of data migration objects on the basis of recorded transactions.

• Charge-free for SAP customers and partners.

or u go dis link :-

www.saptechnical.com

here u can find out d tutorials for doing it step by step.

plzzz do give points also.

regards,

ric.s