---
title: "Zero-Downtime Postgres Migrations: A 2026 Developer Guide"
url: https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh
source_url: https://www.alexcloudstar.com/blog/zero-downtime-postgres-migrations-2026
type: article
source: "Alex CloudStar"
author: "Alex Cloudstar"
published: 2026-05-15T09:33:46.543Z
updated: 2026-05-16T06:00:11.119Z
tags: ["postgresql"]
reading_time: 20
upvotes: 0
comments: 0
language: en
---

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# Zero-Downtime Postgres Migrations: A 2026 Developer Guide

**[Alex CloudStar](https://daily.dev/sources/alexcloudstar)** · [@alexcloudstar](https://daily.dev/alexcloudstar) · 20 min read · 0 upvotes · 0 comments

## Summary

A comprehensive guide to running Postgres schema migrations without downtime. Covers the ACCESS EXCLUSIVE lock trap, the expand-and-contract (parallel change) pattern broken into five deploy steps, and safe variants for common operations: adding columns, renaming columns, creating indexes with CONCURRENTLY, changing column types, and adding constraints with NOT VALID. Also covers safe backfill scripting in small batches, lock_timeout and statement_timeout settings, rollback strategies, and tooling recommendations (pgroll by Xata, Atlas by Ariga). Includes a personal production checklist and guidance on which operations to avoid during business hours.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.alexcloudstar.com/blog/zero-downtime-postgres-migrations-2026>

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---

Tags: [#postgresql](https://daily.dev/tags/postgresql)

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