SUMMARY:
Learn how Ora2Pg simplifies Oracle to PostgreSQL migration through schema conversion, assessment reports, and data migration.
Table of contents
Introduction
Database migrations are often viewed as one of the most challenging projects in an organization’s technology roadmap. While moving data from one database to another is relatively straightforward, ensuring application compatibility, preserving business logic, maintaining performance, and minimizing downtime require careful planning.
Over the past few years, many organizations have started evaluating PostgreSQL as an alternative to Oracle for new applications and, in some cases, existing workloads. This shift is not due to Oracle lacking enterprise capabilities. Oracle remains one of the most mature, feature-rich, and reliable relational database management systems available today and continues to power thousands of mission-critical applications across industries.
One of the primary reasons organizations are considering PostgreSQL is the licensing and support cost associated with Oracle. As businesses continue their cloud modernization initiatives and adopt open-source technologies, PostgreSQL has become an attractive option due to its lower total cost of ownership, strong community support, and continuous innovation.
Once the decision to migrate has been made, the next question is usually:
“How do we migrate an Oracle database efficiently without manually rebuilding every object?”
For many database professionals, the answer begins with Ora2Pg.
What is Ora2Pg?
Ora2Pg is an open-source migration and assessment tool designed specifically to help migrate Oracle databases to PostgreSQL.
Rather than serving only as a data export utility, Ora2Pg analyzes Oracle databases, generates migration reports, converts database objects into PostgreSQL-compatible SQL, exports data, and identifies areas that require manual intervention.
One of its greatest strengths is helping teams understand the complexity of a migration before the work begins.
Why Use Ora2Pg?
Large Oracle environments often contain hundreds or even thousands of database objects, including tables, indexes, views, sequences, triggers, stored procedures, packages, and functions. Manually converting each object would be both time-consuming and error-prone.
Ora2Pg automates much of this work by generating PostgreSQL-compatible scripts and highlighting Oracle-specific features that may need additional attention.
Instead of starting with a blank page, database administrators begin with a substantial portion of the migration already completed.
Start with an Assessment
A successful migration always begins with understanding the source database.
Ora2Pg provides an assessment report that analyzes the Oracle database and estimates the migration effort.
Running the following command generates a comprehensive report:
ora2pg -t SHOW_REPORTThe assessment identifies Oracle features without direct PostgreSQL equivalents, analyzes PL/SQL complexity, estimates the required manual effort, identifies unsupported objects, and provides an overall migration cost estimate.
This report allows project teams to identify potential challenges early, rather than discovering them during production migration.
Database Objects Supported by Ora2Pg
Ora2Pg can migrate many Oracle database objects automatically, including tables, indexes, constraints, views, sequences, triggers, and data.
Support for stored procedures, functions, packages, materialized views, and synonyms depends on their complexity. Many objects can be converted automatically, while others require manual review or modification.
The amount of manual effort largely depends on how extensively Oracle-specific features are used in the application.
Final Thoughts
Ora2Pg has become one of the most widely adopted tools for migrating from Oracle to PostgreSQL because it simplifies what would otherwise be an extremely labor-intensive process. By automating schema conversion, generating assessment reports, exporting data, and identifying Oracle-specific functionality, it significantly reduces the manual work required in a migration project.
At the same time, successful database migrations depend on much more than the tools being used. Careful planning, multiple rounds of testing, application validation, and performance tuning remain essential throughout the process.
Organizations are not necessarily moving away from Oracle because of technical limitations. Oracle continues to be an industry-leading enterprise database platform. In many cases, the decision is driven by business objectives such as reducing licensing costs, embracing open-source technologies, or standardizing cloud infrastructure.
With the right planning and the right tools, Ora2Pg provides a practical and efficient starting point for organizations looking to migrate Oracle workloads to PostgreSQL while minimizing risk and preserving application reliability.