---
title: "Discussion on \"How PostgreSQL VACUUM Works: Dead Tuples, FSM/VM, and Locking\" | Hashnode"
description: "Discussion on \"How PostgreSQL VACUUM Works: Dead Tuples, FSM/VM, and Locking\". A detailed guide to PostgreSQL VACUUM. Learn how dead tuples are cleaned, how the Free Space Map (FSM) and Visibility Map (VM) work, the difference between"
url: "https://hashnode.com/posts/how-postgresql-vacuum-works-dead-tuples-fsmvm-and-locking/68c94f0fcc6f178436ed13a1"
---

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# [How PostgreSQL VACUUM Works: Dead Tuples, FSM/VM, and Locking](https://krishnakrmahto.hashnode.dev/how-postgresql-vacuum-works-dead-tuples-fsmvm-and-locking?utm_source=hashnode&utm_medium=feed)

A detailed guide to PostgreSQL VACUUM. Learn how dead tuples are cleaned, how the Free Space Map (FSM) and Visibility Map (VM) work, the difference between

Sep 16, 2025 · 5 min read · krishnakrmahto.hashnode.dev  
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## Written by

[Krishna Kumar Mahto](https://hashnode.com/@krishnakrmahto)

@krishnakrmahto · Bangalore, IN

  
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Software Engineer - Backend

Software Engineer - Backend

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