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Why Companies Are Leaving Oracle for PostgreSQL (And How to Do It Safely)

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TL;DR: Oracle licensing has become a serious financial burden.
A dual-socket server running Oracle Enterprise Edition can cost over €350,000 in base licenses alone, with 22% annual support fees that rise every year.
PostgreSQL is now the most widely used database among developers, with 55.6% adoption overall and 58.2% among professional developers in the 2025 Stack Overflow Developer Survey and proven enterprise maturity.
Companies that have made the switch report 70–80% reductions in database licensing costs.
This post explains what's driving the exodus and what it takes to migrate safely.

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8 Architectural Differences Between Oracle and PostgreSQL That Impact Performance

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Many companies migrating from Oracle to PostgreSQL assume the main challenge will be SQL syntax differences.

But in reality, the biggest changes are architectural.

If you come from an Oracle background (RAC, Exadata, Enterprise environments), understanding these differences is essential because they directly affect:

  • Performance tuning
  • Troubleshooting
  • Capacity planning
  • Scaling strategies

Below are 8 key architectural differences between Oracle and PostgreSQL that impact performance the most.

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