---
title: "No Dirty Reads: Everything you always wanted to know about SQL isolation levels (but were too afraid to ask)"
url: https://daily.dev/posts/no-dirty-reads-everything-you-always-wanted-to-know-about-sql-isolation-levels-but-were-too-afraid-2tvbkyqc5
source_url: https://www.cockroachlabs.com/blog/sql-isolation-levels-explained/
type: article
source: "CockroachDB"
author: "Cockroach Labs"
published: 2024-02-08T16:49:21.301Z
updated: 2024-05-09T08:39:06.345Z
tags: ["performance"]
reading_time: 8
upvotes: 1
comments: 1
language: en
---

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# No Dirty Reads: Everything you always wanted to know about SQL isolation levels (but were too afraid to ask)

**[CockroachDB](https://daily.dev/sources/cockroachdb)** · [@cockroachdb302](https://daily.dev/cockroachdb302) · 8 min read · 1 upvotes · 1 comments

## Summary

Transaction isolation levels in SQL determine how much a transaction is affected by other concurrent transactions. There are four levels: READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, and SERIALIZABLE. The higher the isolation level, the less affected the transaction is, but there is a trade-off between data accuracy and performance.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.cockroachlabs.com/blog/sql-isolation-levels-explained/>

## Community discussion

Top comments from developers on daily.dev.

**@farhanshahid** · 0 upvotes

> Theories we know but it would be nice if you add next time some relevant implementations
> Thanks for the revision 👍

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---

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

[View this post on daily.dev](https://daily.dev/posts/no-dirty-reads-everything-you-always-wanted-to-know-about-sql-isolation-levels-but-were-too-afraid-2tvbkyqc5)