Oracle to PostgreSQL Migration

As Oracle licensing costs rise and organizations seek vendor independence, PostgreSQL has become the leading open-source alternative. Zwiegnet specializes in low-risk Oracle to PostgreSQL migrations, preserving data integrity, functionality, and performance while significantly reducing total cost of ownership.

We follow a proven methodology tailored to your environment.

Our migration services include:

• Assessment & Planning – Inventory of schemas, PL/SQL packages, triggers, procedures, views, sequences, and dependencies.
• Schema Conversion – Automated and manual conversion using tools like ora2pg, AWS SCT, or custom scripts for complex objects.
• Data Migration – Efficient transfer via pg_dump/custom loaders, Oracle Data Pump, GoldenGate, or logical replication with minimal downtime.
• PL/SQL to PL/pgSQL Refactoring – Conversion of stored procedures, functions, packages, and triggers to PostgreSQL equivalents.
• Application Changes – Updates to SQL syntax (CONNECT BY → recursive CTEs, MINUS → EXCEPT, ROWNUM → LIMIT), connection strings, and drivers.
• High Availability Setup – Implementation of streaming replication, Patroni, repmgr, or pglogical for HA and read scaling.
• Performance Tuning – Indexing strategies, query optimization, configuration tuning, and extension usage (pg_trgm, PostGIS, etc.).
• Testing & Validation – Unit testing, regression testing, data reconciliation, and parallel runs to ensure equivalence.
• Cutover & Go-Live – Zero or near-zero downtime strategies using logical replication or change data capture.
• Post-Migration Support – Ongoing tuning, monitoring, backup configuration, and knowledge transfer.

Benefits include dramatic cost savings, access to powerful PostgreSQL extensions, modern features (JSONB, full-text search, partitioning), and freedom from vendor lock-in.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, personal service with proven database migration experience.