---
title: "pgroll — Database Glossary | Xata"
description: "An open-source PostgreSQL schema migration tool enabling zero-downtime, reversible schema changes using the expand/contract pattern. Maintains multiple ..."
source: "https://xata.io/glossary/pgroll"
---

# pgroll

Extensions[Open Source](https://github.com/xataio/pgroll)

An open-source PostgreSQL schema migration tool enabling zero-downtime, reversible schema changes using the expand/contract pattern. Maintains multiple schema versions simultaneously through versioned views.

Related terms

[Expand / Contract Pattern](/glossary/expand-contract)[Zero-Downtime Migration](/glossary/zero-downtime-migration)

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