Data migration in Oracle Applications (Oracle Apps) involves transferring data from legacy systems or other applications into Oracle's ERP system, such as Oracle E-Business Suite (EBS), Oracle Fusion, or Oracle Cloud. This is critical during ERP implementations or upgrades to ensure that all relevant historical and operational data is available in the new system.
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Project involvement for Data Migrations activities from Legacy System to Oracle 11i.
1. Planning and Assessment
Data Analysis: Identifying the data entities in the legacy system that need to be migrated (e.g., customers, suppliers, transactions, etc.).
Mapping Requirements: Defining the mapping of legacy data to Oracle Apps data structures. This involves aligning fields, data types, and relationships.
Data Cleansing: Remove redundant, outdated, or inconsistent data in the source system to ensure high-quality data is migrated.
2. Data Extraction
Extract from Legacy System: Use tools (like SQL, PL/SQL scripts, or data extraction tools) to pull data from the legacy system. Ensuring that this data aligns with Oracle Apps format requirements.
ETL (Extract, Transform, Load) Tools: You can use ETL tools like Oracle Data Integrator (ODI), Informatica, or custom scripts to extract and transform data for Oracle Apps.
3. Data Transformation
Data Conversion: Convert data to the format and structure required by Oracle Apps. This can include changing data types, cleaning up formatting issues, or modifying key structures to match the Oracle system.
Mapping Validation: Ensure data conforms to business rules and matches Oracle requirements. This step is vital for avoiding errors during loading.
4. Data Loading
Interface Tables: Use Oracle interface tables to load data. Interface tables act as intermediaries between the source data and the target tables in Oracle.
API & Open Interface Programs: For certain data entities, Oracle provides APIs or Open Interfaces that validate and load data. For example:
Customer Interface (RA_CUSTOMER_INTERFACE): For loading customer data.
Supplier Interface (PO_VENDORS_INTERFACE): For loading suppliers.
Item Interface (INV_ITEM_INTERFACE): For loading inventory items.
SQL*Loader: Oracle’s SQL*Loader utility can be used to bulk-load data into interface tables.
5. Data Validation and Testing
Validation Reports: Generated reports to validate loaded data and ensure accuracy against the original data.
Reconciliation: Verified that the migrated data matches the source data regarding completeness and accuracy.
Testing: Performed unit testing, system testing, and user acceptance testing (UAT) to confirm that data migration has succeeded without issues.
6. Error Handling and Reconciliation
Error Correction: Reviewed error logs from interface tables, APIs, or Open Interface Programs, correct issues, and re-run the load processes.
Reconciliation Reports: Generated reports comparing the source and target systems to ensure all data was migrated as expected.
7. Go-Live Preparation
Final Migration & Cutover: Schedule the final migration run after the last data cleanup and validation. Ensure minimal downtime for a smooth transition.
Data Backup: Backup both the source and target databases before going live to safeguard against unexpected issues.
Tools Commonly Used in Oracle Apps Data Migration
Oracle Data Integrator (ODI): Oracle's ETL tool designed for data extraction, transformation, and loading.
SQL*Loader: Oracle utility for bulk-loading data into database tables.
Oracle APIs & Interfaces: Provided by Oracle for specific data entities.
Below example of one of the migration for PO:
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