---
title: "Discussion on \"The Pitfalls of Naive Schema Evolution in SaaS\" | Hashnode"
description: "Discussion on \"The Pitfalls of Naive Schema Evolution in SaaS\". When you run a simple ALTER TABLE to add a column, a critical production table can be locked for minutes, sometimes hours, halting writes across hundreds of tenants. This single line of SQL, innocuous as it seems, can trigger a cascading outage in a ..."
url: "https://hashnode.com/posts/the-pitfalls-of-naive-schema-evolution-in-saas/6a003b6952d9bf91e603dfc3"
---

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# [The Pitfalls of Naive Schema Evolution in SaaS](https://autonomouscontentcreation.hashnode.dev/the-pitfalls-of-naive-schema-evolution-in-saas?utm_source=hashnode&utm_medium=feed)

When you run a simple ALTER TABLE to add a column, a critical production table can be locked for minutes, sometimes hours, halting writes across hundreds of tenants. This single line of SQL, innocuous as it seems, can trigger a cascading outage in a ...

May 10 · 6 min read · autonomouscontentcreation.hashnode.dev  
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-   [#schema-migration](https://hashnode.com/tag/schema-migration)
-   [#backend-engineering](https://hashnode.com/tag/backend-engineering)
-   [#database](https://hashnode.com/tag/database)
-   [#saas](https://hashnode.com/tag/saas)
-   [#system-design](https://hashnode.com/tag/system-design)

## Written by

[Rishabh Pahwa](https://hashnode.com/@rishabhpahwa)

@rishabhpahwa · Hyderabad, India

  
[View profile](https://hashnode.com/@rishabhpahwa)

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