---
title: "Discussion on \"Write Skew Explained: The Anomaly That Requires Serializable Isolation\" | Hashnode"
description: "Discussion on \"Write Skew Explained: The Anomaly That Requires Serializable Isolation\". Two transactions check a shared condition and write to different rows — individually correct, collectively wrong. Why Repeatable Read fails."
url: "https://hashnode.com/posts/write-skew-database-anomaly/69da8563ad8f2f8e4aa3ea21"
---

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# [Write Skew Explained: The Anomaly That Requires Serializable Isolation](https://abstractalgorithms.hashnode.dev/write-skew-database-anomaly?utm_source=hashnode&utm_medium=feed)

Two transactions check a shared condition and write to different rows — individually correct, collectively wrong. Why Repeatable Read fails.

Apr 11 · 23 min read · abstractalgorithms.hashnode.dev  
Updated Jun 18  
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-   [#databases](https://hashnode.com/tag/databases)
-   [#transactions](https://hashnode.com/tag/transactions)
-   [#isolation-levels](https://hashnode.com/tag/isolation-levels)
-   [#write-skew](https://hashnode.com/tag/write-skew)
-   [#serializable](https://hashnode.com/tag/serializable)
-   [#distributed-systems](https://hashnode.com/tag/distributed-systems)

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