Oracle has powered business systems for decades, but its licensing and support costs push many organizations to look for an alternative. PostgreSQL is the most common destination: open source, mature, feature-rich, and available as a managed service on every major cloud. The challenge is that the two databases don't behave the same way — PL/SQL, data types, sequences, packages, and SQL quirks all need careful conversion.
Our Oracle to PostgreSQL migration services handle that conversion end to end. We assess your Oracle estate, convert schemas and PL/SQL, move and synchronize data with minimal downtime, update application SQL, validate every table and result, and tune performance on PostgreSQL — on-premise or on Amazon RDS, Aurora PostgreSQL, Azure Database for PostgreSQL, or Google Cloud SQL and AlloyDB.
What is Oracle to PostgreSQL migration? Oracle to PostgreSQL migration is the process of moving databases from Oracle Database to PostgreSQL, including converting schemas and data types, rewriting PL/SQL procedures, functions, triggers, and packages into PL/pgSQL, migrating data with tools such as ora2pg or AWS DMS, keeping data synchronized until cutover, updating application queries, validating results, and tuning performance on the new database.
Oracle to PostgreSQL Migration at a Glance
Question | Answer |
|---|---|
What it is | Moving Oracle databases, code, and data to PostgreSQL with minimal downtime |
Core deliverables | Migration assessment, converted schemas and PL/pgSQL, migrated and synchronized data, updated application SQL, validation reports, performance tuning |
Targets | Self-managed PostgreSQL, Amazon RDS, Aurora PostgreSQL, Azure Database for PostgreSQL, Google Cloud SQL, AlloyDB |
Tools | ora2pg, AWS Schema Conversion Tool and DMS, Azure and Google migration services, custom scripts |
Downtime approach | Bulk load plus change data capture for a short cutover window |
Engagement models | Migration assessment, full migration project, post-migration optimization |
Why Migrate From Oracle to PostgreSQL
Lower licensing costs. PostgreSQL is open source, with no per-core license fees.
Cloud flexibility. Managed PostgreSQL is available on AWS, Azure, and Google Cloud.
Modern features. JSONB, strong indexing options, extensions such as PostGIS and pgvector.
Large talent pool. PostgreSQL skills are widely available.
Avoiding vendor lock-in. Open standards and broad tool support.
Key Conversion Differences
Oracle | PostgreSQL | What we do |
|---|---|---|
PL/SQL procedures, functions, packages | PL/pgSQL functions and procedures; no native packages | Rewrite logic and organize packages into schemas or function groups |
NUMBER, VARCHAR2, DATE | NUMERIC, INTEGER, VARCHAR, TIMESTAMP | Map each column to the best-fitting type |
Sequences and triggers for IDs | Identity columns or sequences | Convert and preserve current values |
Empty string treated as NULL | Empty string and NULL are different | Find and fix logic that depends on this behavior |
ROWNUM, CONNECT BY, DECODE, NVL | LIMIT, recursive CTEs, CASE, COALESCE | Rewrite queries and test results |
Autonomous transactions, some built-in packages | No direct equivalent | Redesign or use extensions where appropriate |
These differences are why automated tools handle much of the schema but rarely all of the code — human conversion and testing are essential.
Our Oracle to PostgreSQL Services
Migration assessment
We inventory schemas, objects, PL/SQL code, data volumes, and connected applications, run automated compatibility analysis, and estimate effort and risk for each component.
Schema conversion
We convert tables, data types, constraints, indexes, sequences, views, and partitions, reviewing automated output carefully.
PL/SQL to PL/pgSQL conversion
We rewrite procedures, functions, triggers, and packages, and test that business logic produces identical results.
Application SQL changes
We find and update Oracle-specific SQL in application code, reports, and integrations.
Data migration and synchronization
We bulk-load data, then keep PostgreSQL in sync with change data capture until cutover.
Validation
We compare row counts, checksums, and sample records for every table, and run application and report test suites against the new database.
Performance tuning
We tune indexes, queries, configuration, and connection pooling so PostgreSQL meets or beats Oracle performance for your workloads.
Cutover and rollback
We rehearse cutover, keep Oracle available until PostgreSQL is proven, and agree rollback triggers in advance.
How It Works
Step 1: Assess
We analyze your Oracle estate and produce an effort, risk, and cost estimate.
Step 2: Convert
We convert schemas and code, then test them against copies of your data.
Step 3: Migrate and sync
We load data and keep it synchronized.
Step 4: Test
We validate data and run application, report, and performance tests.
Step 5: Cut over
We switch applications to PostgreSQL in a short, rehearsed window.
Step 6: Optimize and retire
We tune the new database and help decommission Oracle.
What You Get
A detailed migration assessment with effort and risk by component
Converted, tested schemas and PL/pgSQL code
Updated application SQL
Migrated, synchronized, validated data
A rehearsed cutover with rollback plan
Performance tuning and documentation
Who This Is For
Companies cutting Oracle costs | Teams moving to the cloud | Software vendors | Organizations with ageing Oracle versions |
|---|---|---|---|
Want to remove or reduce Oracle licensing | Want managed PostgreSQL on AWS, Azure, or Google Cloud | Want to support PostgreSQL for their product | Need to modernize before support ends |
Why Work With Codersarts
Oracle to PostgreSQL migrations succeed or fail on the details: PL/SQL logic, NULL handling, data types, and application SQL that nobody remembered. We combine automated analysis with careful manual conversion and testing, validate every table, and keep a way back until PostgreSQL is proven. It follows our standard database migration process, and our database design team can improve the structure along the way.
Frequently Asked Questions
How long does an Oracle to PostgreSQL migration take?
Small databases with little PL/SQL can move in a few weeks. Larger systems with extensive PL/SQL, packages, and many applications typically take several weeks to a few months, including testing.
Can tools convert Oracle to PostgreSQL automatically?
Tools such as ora2pg and AWS Schema Conversion Tool convert much of the schema and some code. Complex PL/SQL, packages, and application SQL usually need manual conversion and testing.
Will performance be the same on PostgreSQL?
With proper tuning, PostgreSQL performs well for most Oracle workloads. We test performance before cutover and tune queries, indexes, and configuration as needed.
How much does Oracle to PostgreSQL migration cost?
Cost depends on database size, the amount of PL/SQL and application SQL to convert, and downtime requirements. An assessment provides a detailed estimate.
What happens to Oracle packages?
PostgreSQL has no direct package equivalent. We reorganize package code into schemas and grouped functions, and handle package variables and state carefully.
Can we migrate with minimal downtime?
Yes. We bulk-load data and keep it synchronized with change data capture, so the final cutover can be done in a short window.
Which PostgreSQL platform should we choose?
Self-managed PostgreSQL gives full control. Amazon Aurora PostgreSQL, RDS, Azure Database for PostgreSQL, Google Cloud SQL, and AlloyDB reduce maintenance. We recommend based on your cloud, performance needs, and cost.
Related Data Services
Cloud Data Migration — move the wider data estate to the cloud
Data Modernization — modernize the full data stack
SQL Queries — query tuning on PostgreSQL after migration
AWS Data Services — Aurora PostgreSQL and the AWS data platform
Ready to Leave Oracle Behind?
Tell us about your Oracle databases and the applications that use them. We'll assess the effort and show you what the migration would take.
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