---
title: "Discussion on \"Write-Ahead Logging (WAL) in PostgreSQL: How It Works\" | Hashnode"
description: "Discussion on \"Write-Ahead Logging (WAL) in PostgreSQL: How It Works\". Guide to PostgreSQL Write-Ahead Logging (WAL). Learn how WAL records changes, how checkpoints and the background writer work, and how crash recovery replays"
url: "https://hashnode.com/posts/postgresql-write-ahead-logging-wal-checkpoints-background-writer/68cbba412cf1651d3549007a"
---

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# [Write-Ahead Logging (WAL) in PostgreSQL: How It Works](https://krishnakrmahto.hashnode.dev/postgresql-write-ahead-logging-wal-checkpoints-background-writer?utm_source=hashnode&utm_medium=feed)

Guide to PostgreSQL Write-Ahead Logging (WAL). Learn how WAL records changes, how checkpoints and the background writer work, and how crash recovery replays

Sep 18, 2025 · 5 min read · krishnakrmahto.hashnode.dev  
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[Krishna Kumar Mahto](https://hashnode.com/@krishnakrmahto)

@krishnakrmahto · Bangalore, IN

  
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Software Engineer - Backend

Software Engineer - Backend

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