Schema migrations on live, multi-million-row production databases are among the riskiest operations in software engineering. Running a naive `ALTER TABLE` that acquires an `ACCESS EXCLUSIVE` lock or renaming NoSQL entity attributes without dual-read/dual-write compatibility can bring down an entire SaaS platform.
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Zero-Downtime Database Migration Guides on This Site
- Distributed Alembic Migrations in CI/CD: Managing Multi-Service Alembic Migrations Inside CI/CD
- Safe NoSQL Attribute Renaming & Batch Reindexing: Object Attribute Renaming in NoSQL & Reindexing Millions of Legacy Entities
- Datastore Mode vs. Native Firestore Migration: Lock Risks and Query Migration Costs at Scale