The sets of data required by Oracle Applications can be broadly classified in to 4 categories

• Master Data : Item, Customer, Vendor, Bank Accounts, etc.
• Opening Balances: On-Hand Quantity of Items, GL Balances, etc.
• Open Transactions : Open Purchase Orders, Open Sales Order, Open Invoice etc.
• Set-up Data :  Item Categories, Stock Locators

Similary source of data can be classified as

• Existing Applications : DB2, Tally, SMS, etc.
• Electronic Data : Comming through EDI in formats of Excel, Word, etc.
• Hard Copy Data : In Registers
• Non - Existent : Equipment Master, Collect and then migrate

The above diagram depicts the high level Data Migration approach from Legacy to ORACLE.

At a minimum, the data migration from Legacy to ORACLE consists of these tasks:

• Extracting the data from Legacy data base.
• Loading the extracted data into staging area.
• Mapping and transformation of source data.
• Migrating source data from staging area into target data base.