--- title : " Expand-Contract vs Blue-Green: PostgreSQL Zero-Downtime Migrations" published : true description : " Compare expand-contract pattern and blue-green deployment for PostgreSQL schema migrations. Learn when to use each strategy for zero-downtime database changes." tags : postgresql, architecture, devops, cloud canonical_url : https://blog.mvpfactory.co/expand-contract-vs-blue-green-postgresql-zero-downtime-migrations --- ## What You Will Learn By the end of this tutorial, you will understand two battle-tested strategies for zero-downtime PostgreSQL schema migrations — expand-contract and blue-green — and know exactly when to reach for each one. I will walk you through working SQL examples you can apply to your own tables today.…