A PostgreSQL alternative should be evaluated against the application's actual contract. SQL support alone does not guarantee equivalent transactions or extensions.
Trial
- Import representative schema and data, including constraints, indexes, and timezones.
- Run critical queries at realistic concurrent read/write load.
- Test multi-statement transactions, isolation, uniqueness, and failure rollback.
- Check extensions, JSON behavior, full-text search, migrations, and driver compatibility.
- Rehearse backup, point-in-time recovery, replication failure, and export back to PostgreSQL.
Document each semantic mismatch. A faster single query is not a fair trade if writes or recovery no longer meet the application's requirements.
Akousa