# Zero Downtime Database Migrations: Safe Schema Changes

DevFeed: [Zero Downtime Database Migrations: Safe Schema Changes](<https://devfeed.tech/articles/zero-downtime-database-migrations-safe-schema-changes-13508.md>)

Original publisher: [Read original article](<https://www.harness.io/blog/zero-downtime-database-migrations-safe-schema-changes>)

Author: Animesh Pathak

Published: 2026-07-16T00:00:00Z

Content type: tutorial

Language: en

Sources: [Harness Blog](<https://devfeed.tech/sources/harness-blog.md>)

Topics: [Database](<https://devfeed.tech/topics/database.md>), [Database Migration](<https://devfeed.tech/topics/database-migration.md>), [migration](<https://devfeed.tech/topics/migration.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [availability](<https://devfeed.tech/tags/availability.md>), [blog](<https://devfeed.tech/tags/blog.md>), [compatibility](<https://devfeed.tech/tags/compatibility.md>), [consistency](<https://devfeed.tech/tags/consistency.md>), [database](<https://devfeed.tech/tags/database.md>), [database-migration](<https://devfeed.tech/tags/database-migration.md>), [learn](<https://devfeed.tech/tags/learn.md>), [migrations](<https://devfeed.tech/tags/migrations.md>), [patterns](<https://devfeed.tech/tags/patterns.md>), [production](<https://devfeed.tech/tags/production.md>), [schema](<https://devfeed.tech/tags/schema.md>), [strategy](<https://devfeed.tech/tags/strategy.md>), [uptime](<https://devfeed.tech/tags/uptime.md>)

## AI overview

This tutorial explains zero-downtime database migrations through backward-compatible schema changes, the expand-and-contract pattern, dual writes, and phased rollouts. It emphasizes preserving application availability, data consistency, and compatibility while old and new application versions run together.

## Source excerpt

Learn zero downtime database migration strategies using backward-compatible schema changes, dual writes, and safe rollout patterns. | Blog