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Technical notes · Dipak Rijal

Oracle to PostgreSQL
Migration Lessons

A practical guide to reducing risk when modernising Oracle workloads toward PostgreSQL and Aurora PostgreSQL.

Start with assessment, not tooling

Before choosing tools, understand schema complexity, PL/SQL usage, extensions, data volume, integration timing and downtime tolerance. A migration fails when hidden complexity appears too late.

Validation is the real migration

Full-load and CDC success is not enough. Teams need row counts, reconciliation, application testing, performance baselines and rollback criteria before cutover.

Performance changes after platform change

Oracle and PostgreSQL optimise differently. SQL rewrites, indexes, statistics and transaction patterns should be reviewed as a first-class workstream, not as an afterthought.

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