Oracle to PostgreSQL Migration: A Comprehensive Guide

Migrating from Oracle to PostgreSQL is becoming a priority for businesses looking to reduce costs, improve flexibility, and embrace open-source technologies. While Oracle provides enterprise-grade solutions, its proprietary nature and licensing fees can be restrictive. PostgreSQL, on the other hand, offers a robust, scalable, and cost-effective alternative.

This guide explores the steps, challenges, and tools available for a smooth Oracle to PostgreSQL migration, focusing on an automated approach using Estuary Flow.

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Why Consider Migrating to PostgreSQL?

1. Cost Reduction

Oracle's high licensing and operational costs can be burdensome. PostgreSQL eliminates these expenses as it is open-source and freely available for commercial and non-commercial use.

2. Open-source Flexibility

PostgreSQL provides extensive customization options through extensions, whereas Oracle relies on costly add-ons for advanced functionalities.

3. Multi-cloud & Hybrid Deployment

Unlike Oracle, PostgreSQL allows seamless multi-cloud and hybrid deployments, supporting AWS, GCP, Azure, and on-premise setups without vendor lock-in.

4. Strong Community Support

PostgreSQL is backed by a strong global community that continuously enhances the database with new features and security updates.

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Automated Oracle to PostgreSQL Migration Using Estuary Flow

Automating the migration process helps minimize downtime and human error while ensuring real-time synchronization. Estuary Flow is an advanced ETL tool that simplifies the process with minimal configuration.

Key Features of Estuary Flow

• Change Data Capture (CDC): Supports real-time data sync, reducing the risk of data loss.
• No-code Configuration: Enables easy migration without requiring extensive technical knowledge.
• 200+ Pre-built Connectors: Offers seamless integration with multiple databases, cloud services, and applications.
• Secure & Scalable: Supports private deployments, ensuring complete control over data.

Steps to Migrate Data Using Estuary Flow

Step 1: Configure Oracle as the Source

1. Log in to Estuary Flow.
2. Select Sources from the dashboard and click + NEW CAPTURE.
3. Search for the Oracle Database connector and select the Real-time option.
4. Provide the necessary credentials:
   • Name: Unique identifier for the connection.
   • Server Address: Hostname and port of the Oracle database.
   • User & Password: Authentication credentials.
5. Click NEXT and then SAVE AND PUBLISH to finalize the connection.

Step 2: Set Up PostgreSQL as the Destination

1. After setting up Oracle as a source, click MATERIALIZE COLLECTIONS.
2. Alternatively, navigate to Destinations and click + NEW MATERIALIZATION.
3. Search for the PostgreSQL connector and select Materialization.
4. Enter the following details:
   • Name: Unique name for the destination.
   • Address: PostgreSQL host and port (default: 5432).
   • User & Password: PostgreSQL credentials.
5. Click NEXT > SAVE AND PUBLISH.

Once configured, Estuary Flow will migrate and sync Oracle data into PostgreSQL in real-time.

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Common Challenges in Oracle to PostgreSQL Migration

1. Data Type Mismatch

• Oracle NUMBER → PostgreSQL NUMERIC or BIGINT
• Oracle CLOB → PostgreSQL TEXT
• Oracle DATE → PostgreSQL TIMESTAMP

2. Stored Procedures & Functions

Oracle uses PL/SQL, whereas PostgreSQL uses PL/pgSQL. Converting complex procedures may require rewriting code.

3. Indexing & Performance Optimization

Oracle’s Index-Organized Tables (IOTs) and partitioning methods differ from PostgreSQL, requiring adjustments to maintain performance.

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Conclusion

Migrating from Oracle to PostgreSQL is a strategic move for businesses looking to reduce costs, enhance scalability, and gain more control over their data. While manual migration methods can be time-consuming and error-prone, automated tools like Estuary Flow simplify the process, ensuring real-time synchronization and minimal downtime.

If you’re considering migrating, start with Estuary Flow today to experience seamless and efficient data migration!

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FAQs

1. How long does an Oracle to PostgreSQL migration take?

The duration depends on data volume and the migration method. Automated tools like Estuary Flow speed up the process significantly.

2. Does PostgreSQL support Change Data Capture (CDC)?

Yes, PostgreSQL supports CDC using logical replication and tools like Estuary Flow.

3. Can I migrate stored procedures from Oracle to PostgreSQL?

Yes, but Oracle's PL/SQL must be converted to PostgreSQL’s PL/pgSQL, which may require manual intervention.