Database MigrationIndustry: Enterprise Finance & Core Systems 2025 - 2026

Enterprise Oracle → PostgreSQL Database Migration

Led zero-downtime migration of mission-critical Oracle databases to PostgreSQL, re-engineering complex PL/SQL stored procedures and cutting database licensing costs by 60%.

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60%

Licensing Cost Savings

Reduction in annual database licensing and infrastructure spend

0 mins

Downtime During Cutover

Zero operational downtime achieved via parallel CDC replication

3.5x

Query Execution Speed

Average speedup across top 100 mission-critical database queries

01 · Challenge

The problem on the ground

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The legacy Oracle deployment relied heavily on deeply embedded PL/SQL packages, proprietary triggers, custom data types, and complex stored procedures. A naive migration risked broken application logic, data loss, and costly operational downtime during cutover.

02 · Solution

How we engineered it

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Designed a multi-phase migration strategy featuring automated schema translation, manual PL/SQL to PL/pgSQL re-engineering, comprehensive unit testing, and parallel CDC (Change Data Capture) replication using AWS DMS to guarantee zero-downtime failover.

03 · Architecture

What's running under the hood

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Schema & Data Type Mapping: Converted Oracle specific types (NUMBER, VARCHAR2, CLOB) to native PostgreSQL types (NUMERIC, TEXT, JSONB).

PL/SQL Re-Engineering: Translated 150+ PL/SQL procedures, packages, and triggers into optimized PostgreSQL PL/pgSQL functions.

Zero-Downtime CDC Replication: Configured AWS DMS (Data Migration Service) for continuous data synchronization prior to cutover.

Query & Index Tuning: Created targeted partial and GIN indexes and configured PgBouncer connection pooling for sub-millisecond query execution.

04 · Results

What changed for the client

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Cut total database infrastructure & licensing costs by 60% annually.

Executed 100% data-verified production cutover with zero downtime.

Improved average transaction throughput by 35% under peak load.

Eliminated vendor lock-in, enabling deployment across flexible cloud environments.

Technical Q&A

How was zero downtime achieved during the Oracle to PostgreSQL migration?

Zero downtime was achieved by establishing continuous Change Data Capture (CDC) replication using AWS DMS between the live Oracle database and target PostgreSQL cluster. This allowed the application to cut over instantly with zero data loss or service interruption.

How were Oracle PL/SQL stored procedures converted to PostgreSQL?

Legacy PL/SQL scripts were parsed and translated into PostgreSQL PL/pgSQL functions. Complex logic, autonomous transactions, and packages were modularized, refactored, and validated against an automated test suite to ensure exact behavioral parity.

What financial impact did this database migration deliver?

The migration achieved a 60% reduction in annual database licensing and cloud infrastructure spend, paying back the project investment within 6 months.

Planning a similar database migration project?

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