HELP ME ON DATA MIGRATION PLEASE

Former Member — Thu, 16 Aug 2007 04:57:13 GMT

what is SAP data migration what kind of tools and techniques include in that and also please what are the roles and responsibilities include in that when we are working on project.(RELATED TO ABAP)

Re: HELP ME ON DATA MIGRATION PLEASE

Former Member — Thu, 16 Aug 2007 05:04:09 GMT

Hi Vijay

suppose if the company is migrating fro non-sap to sap.

so from non-sap side consultants download their data into flat files

and sap functional people analyze that data and according to that one they will prepare specs what r the mapping tables in sap and transactions ,

so as a abap developer have to write interface programs bdc's , bapi , lsmw for converting that data into sap.

reward points to all helpful answers

kiran.M

Re: HELP ME ON DATA MIGRATION PLEASE

Former Member — Thu, 16 Aug 2007 05:38:48 GMT

Hi,

Data migration is moving data from legacy system to SAP

Data migration can be done through BDC, LSMW, ALE/IDOCS

Role will be to get the data from legacy system and using program in SAP to upload in to SAP.

Creating the programs in SAP, validation the given data and upload the correct data into SAP. Handling of the error records when uploading large data

Regards

Arun

Re: HELP ME ON DATA MIGRATION PLEASE

Former Member — Thu, 16 Aug 2007 09:02:01 GMT

Data Migration – Current Situation

Data migration or data conversion is a persistent issue facing most organizations who have implemented SAP. Whether it is during the final phases of a new SAP implementation, during SAP upgrades and updates, during corporate restructurings, or during mergers and acquisitions, data migration continues to remain a challenging problem for IT.

Most data migration projects are faced with a time and budget crunch. But, these projects usually require extensive support from programmers and other technical experts and therefore data migration projects tend to get expensive and time-consuming.

The tools for data transfer and data migration provided by SAP are very technical and have a steep learning curve associated with them and they require technical experts to build and implement the data migration scripts.

Data Migration – Ideal Scenario

An ideal data migration scenario would let the data migration project be implemented by the end user departments themselves. A few super-users within these end-user departments that supply the data should have the ability to transfer and migrate data themselves without relying on technical experts. Such a scenario would significantly cut the time and effort required in a data migration project.

Reaching such an ideal scenario would require data migration tools that are easy to learn and require no programming. Furthermore, these tools should work across all the different SAP modules and the SAP products, including the different versions of SAP.

Data Migration

Data Migration is the process of moving required (and most often very large) volumes of data from our clients’ existing systems to new systems. Existing systems can be anything from custom-built IT infrastructures to spreadsheets and standalone databases.

Data Migration encompasses all the necessary steps to cleanse, correct and move the data into the new system *. Technological changes, change in providers, software updates or data warehousing / data mining projects make such delicate and critical operations necessary.

<b>Data Migration can be done using BDC, LSMW, BAPI, Idoc's.</b>

What is the difference between batch input and call transaction in BDC?

Session method.

1) synchronous processing.

2) can tranfer large amount of data.

3) processing is slower.

4) error log is created

5) data is not updated until session is processed.

Call transaction.

1) asynchronous processing

2) can transfer small amount of data

3) processing is faster.

4) errors need to be handled explicitly

5) data is updated automatically

Differences between bdc session method and call transaction method.

The most important aspects of the batch session interface are: - Asynchronous processing - Transfers data for multiple transactions - Synchronous database update During processing, no transaction is started until the previous transaction has been written to the database. - A batch input processing log is generated for each session - Sessions cannot be generated in parallel

The most important aspects of the CALL TRANSACTION USING interface are: - Synchronous processing - Transfers data for a single transaction - Synchronous and asynchronous database updating both possible The program specifies which kind of updating is desired. - Separate LUW for the transaction The system performs a database commit immediately before and after the CALL TRANSACTION USING statement. - No batch input processing log is generated.

Refer this

For 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

Check these link:

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

http://www.sap-img.com/abap/question-about-bdc-program.htm