--- title: Zero-Downtime Postgres Migrations: A 2026 Developer Guide description: A comprehensive guide to running Postgres schema migrations without downtime. Covers the ACCESS EXCLUSIVE lock trap, the expand-and-contract (parallel change)... canonical: https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Zero-Downtime Postgres Migrations: A 2026 Developer Guide | daily.dev og:description: A comprehensive guide to running Postgres schema migrations without downtime. Covers the ACCESS EXCLUSIVE lock trap, the expand-and-contract (parallel change)... og:url: https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh og:image: https://api.daily.dev/og/posts/dRbNZyKBH.png og:image:alt: Zero-Downtime Postgres Migrations: A 2026 Developer Guide og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 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: ## Similar posts on daily.dev - [The Postgres migration that locks your table at 3am, and how to catch it in review](https://daily.dev/posts/the-postgres-migration-that-locks-your-table-at-3am-and-how-to-catch-it-in-review-19nuvuqqn) · Medium · 0 upvotes · 0 comments --- Tags: [#postgresql](https://daily.dev/tags/postgresql) [View this post on daily.dev](https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Zero-Downtime Postgres Migrations: A 2026 Developer Guide","url":"https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/zero-downtime-postgres-migrations-a-2026-developer-guide-drbnzykbh"},"datePublished":"2026-05-15T09:33:46.543Z","dateModified":"2026-05-16T06:00:11.119Z","description":"A comprehensive guide to running Postgres schema migrations without downtime. 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