This was written by Bob Feldbauer. It's time to deploy a new version of our awesome application, but this time we're changing database stuff. Can we do it without an outage? Schema changes can often lock your database, stall your application, and cause an outage, so you'll want to be careful in how you design the infrastructure to permit database changes. Achieving a zero-downtime schema deploymen
![Day 3 - Zero-Downtime MySQL Schema Changes](https://cdn-ak-scissors.b.st-hatena.com/image/square/eabc28451d9adedad0a8b71868aee59ac97c69fe/height=288;version=1;width=512/https%3A%2F%2Fblogger.googleusercontent.com%2Fimg%2Fb%2FR29vZ2xl%2FAVvXsEj8mbjcqrRzjYvTnv5evcwDM3odK2gGKskqg01kZSnMY2zpqsO6wZ0Z6xg-irLllmFcqNRc4gUfs8vp1DxtwqaNdAQgOuMDK_WGelF75jkOLEz-vTwrL2wVZTFpeD1sjy0JP1G-2HeYhaIA%2Fw1200-h630-p-k-no-nu%2Fzero-downtime-mysql1.jpg)