regarding batch data conversions

[Former Member]

hi what r the bdc methods when we r transfering data in background method and what is the purpose of direct input and LSMW methods

[andreas_mann3]

http://help.sap.com/saphelp_47x200/helpdata/en/3e/20d634781a1b7ee10000009b38f83b/frameset.htm

A.

[Former Member]

Hi,

Data Transfer Workbench

Purpose

The Data Transfer Workbench supports the automatic transfer of data into the system.

The Workbench is particularly useful for various business objects with large amounts of data. It guarantees that data is transferred efficiently and ensures that data in the system is consistent.

Features

The Data Transfer Workbench provides the following functions:

Administration and organization of data transfer projects
Tools for analyzing the required SAP structures
Integration of standard data transfer programs
Registration and integration of your own data transfer programs and help programs
Various techniques for loading data
The data is read from a transfer file in SAP format and loaded into your system using one of the techniques below:

BAPI interface
Batch input
Direct input (DINP)
Data conversion using the Legacy System Migration Workbench (LSMW).

Direct Input

Using direct input, you import data directly into the SAP System without creating a batch input session and without running through the individual screens. The documents are posted immediately using function modules. This is therefore the fastest data transfer method.

There are two ways to trigger direct input:

Start the program directly: Note that the system does not generate an error log, nor is it possible to restart the system if an error occurs.
Direct input in the background: In this case, you can restart processing if the program terminates or logical errors occur (material missing, for example). The ability to restart the system ensures that data cannot be posted twice to the database, as the program can be reset to where it terminated. Using the trace you can correct any errors that occurred.
Direct input also has the advantage that it places little load on the system.
You can transfer the following data transfer objects using the direct input method:

Material masters
Accounting documents
Sales documents
Fixed assets
Classification


If you are working with test data, start the direct input directly. For the final data transfer, SAP strongly recommends that you use Transaction BMVO.

Note that with background processing, the input file cannot be stored on the presentation server. Access to presentation server files is only possible when you are working online.

You can find further information on direct input in the Basis documentation BC - Basis Programming Interfaces.

Activities

On the initial screen of the Data Transfer Workbench, enter the logical or physical name of the transfer file into which you have converted your legacy data.
Choose Goto ® Execute data transfer.
The system displays the transaction for direct input (Transaction BMV0).
Further steps to be taken depend on the transfer object and are therefore included in the object-specific documentation.

LSMW

LSMW is used to transfer data from legacy sytem (Non-sap) to SAP systems. This is a bit lenghy process and require lot of configurations. It has been used in Older versions. Here you can provide calculations and restrictions on fields while updating the data into the database.

Process Steps:

1 Maintain Object Attributes

2 Maintain Source Structures

3 Maintain Source Fields

4 Maintain Structure Relations

5 Maintain Field Mapping and Conversion Rules

6 Maintain Fixed Values, Translations, User-Defined

7 Specify Files

8 Assign Files

9 Read Data

10 Display Read Data

11 Convert Data

12 Display Converted Data

13 Start Direct Input Program

Regards,

Jayaram...