Oracle vs PostgreSQL, license cost side by side.

A side by side comparison of Oracle Database and PostgreSQL on license cost, hidden cost ranges and the workloads where each one wins in 2026.

PostgreSQL has zero license fee. Oracle Enterprise Edition lists at $47,500 per Processor before any discount.

The headline gap is enormous. The total cost of ownership is closer than the gap suggests once tooling, operations and migration cost are layered in.

This comparison maps the license models side by side and surfaces the hidden cost ranges that decide most database choices.

How do the license models compare?

Oracle Database license model

Oracle Enterprise Edition is licensed per Processor or per Named User Plus.

Options and packs are licensed on top of the base edition.

• Per Processor at $47,500 list, before discount.
• Named User Plus at $950 list per user, with minimum per Processor.
• Twenty two percent annual support fee.
• Options such as Partitioning at $11,500 per Processor and Advanced Compression at $11,500 per Processor.

PostgreSQL license model

PostgreSQL is released under a permissive open source license.

There is no license fee, no support fee, no per Processor charge.

What does the direct cost look like?

Small workload, four cores

Oracle Enterprise Edition on four cores at one core factor lists at $190,000 before discount, plus $41,800 annual support.

PostgreSQL on the same four cores has zero license fee.

Medium workload, sixteen cores

• Oracle Enterprise Edition at $760,000 before discount, $167,200 annual support.
• PostgreSQL at zero license, paid commercial support optional at $5,000 to $50,000 per year per instance.

Large workload, fifty cores

Oracle Enterprise Edition at $2.375 million before discount, $522,500 annual support, before any options.

PostgreSQL at zero license, commercial support typically $25,000 to $100,000 per year per instance.

Database choice is not a license choice. It is an architecture and skills choice with a license tail that can dominate the bill.

What are the hidden cost ranges?

Migration cost

• Schema migration tools range from open source to $250,000 enterprise licenses.
• Application refactoring is the largest single cost, often two to four times the license headline.
• Stored procedure conversion can stall an entire migration program.

Operational cost

Oracle DBA talent commands a salary premium.

PostgreSQL operations require expertise in extensions, replication and partitioning that mature teams have built but greenfield teams have not.

Tooling cost

Oracle Enterprise Manager is included with the support fee.

PostgreSQL ecosystem tools such as pgAdmin, pgBouncer and pg_partman are open source but require integration effort.

When does each one win?

Where Oracle still wins

• OLTP workloads above fifty thousand transactions per second.
• Workloads that depend on Active Data Guard, Partitioning at scale or RAC.
• Estates with deep Oracle skills and mature operational tooling.
• Regulated industries where Oracle audit posture is already built.

Where PostgreSQL wins

Greenfield applications with no Oracle dependency.

Read heavy workloads with predictable concurrency patterns.

Microservice architectures with small per service databases.

Suggested reading

• Oracle vs AWS RDS. Cross vendor reading from the wider library.
• Oracle Database Licensing Explained. Cross vendor reading from the wider library.
• Oracle Cloud BYOL Pillar. Cross vendor reading from the wider library.

What to do next

1. Identify candidate workloads where the Oracle dependency is shallow.
2. Build a five year TCO model that includes migration, operations and tooling.
3. Score each workload on schema complexity, stored procedure depth and concurrency.
4. Pilot PostgreSQL on a single non critical workload before any program decision.
5. Negotiate the Oracle renewal with a credible migration alternative on the table.
6. Document the migration program in a written business case with phased milestones.
7. Plan the operational skills bridge from Oracle DBA to PostgreSQL DBA.
8. Treat database migration as a multi year program, not a single project.

Frequently asked questions

Is PostgreSQL really free?

The license is free. Operational cost, tooling and optional commercial support carry real cost, but the per Processor license fee is zero.

Can PostgreSQL replace Oracle for an enterprise OLTP workload?

For many enterprise OLTP workloads, yes. For the largest scale OLTP and for workloads with deep Oracle option dependency, the migration is significant.

Does Oracle ever match PostgreSQL on TCO?

Only for workloads where Oracle skills are already in place and migration cost would exceed the license differential over the five year horizon.

What is the biggest migration risk?

Stored procedure and PL/SQL logic. Conversion is rarely automatic and often requires application code refactoring.

Does AWS or Azure managed PostgreSQL change the math?

Yes. Managed PostgreSQL services reduce operational cost but add hyperscaler pricing. Net TCO is usually still well below Oracle.