Database Schema Migration
A focused chapter on database schema migration, with practical delivery concerns, trade-offs, and the operational questions behind CI/CD work.
Why Database Schema Changes Need the Same Discipline as Code
Imagine this: your team has just deployed a new feature. The application code is running fine. But five minutes later, errors start pouring in. A column
Writing Database Migration Scripts That Won't Blow Up Production
You have a new feature ready. The code is reviewed, tested, and merged. But there is one thing standing between you and deployment: a database change
When Your Database Schema Needs Version Control Too
Imagine this: your team has a solid CI/CD pipeline for the application code. Every pull request triggers automated tests, builds a container image, and
Additive Database Changes: How to Add Without Breaking Production
You have a running application with thousands of active users. Your team needs to add a phone number field to the user profile. The change seems small
When Deleting a Database Column Breaks Production: Managing Destructive Schema Changes
You have a database migration that removes an unused column. The SQL looks clean. The migration runs without errors. But five minutes later, alerts start
When Adding an Index Freezes Your Application
Your team has been tracking a slow query for weeks. The users table has grown to millions of rows, and searching by email now takes seconds instead of
When Database Migrations Break Running Applications
Your team has just deployed a new feature. The rollout looks clean. But five minutes later, the on-call engineer sends a screenshot of error logs. Old
Why Your Database Migration Needs More Than a Developer Laptop Test
You have a migration script that runs perfectly on your laptop. The syntax is correct, the new column appears, and the test data fits neatly into the new