---
title: "Discussion on \"Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle\" | Hashnode"
description: "Discussion on \"Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle\". A small fintech schema, four optimizers, and a few execution plans that did not behave the same way"
url: "https://hashnode.com/posts/testing-index-assumptions-across-postgresql-mysql-sql-server-and-oracle/6a38e01b5fcc3d4dfeb66f7f"
---

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# [Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle](https://rummansystems.hashnode.dev/testing-index-assumptions-across-postgresql-mysql-sql-server-and-oracle?utm_source=hashnode&utm_medium=feed)

A small fintech schema, four optimizers, and a few execution plans that did not behave the same way

Jun 22 · 13 min read · rummansystems.hashnode.dev  
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## Written by

[Rumman Hussain Siddiqui](https://hashnode.com/@rumman90)

@rumman90 · Karachi, Pakistan

  
[View profile](https://hashnode.com/@rumman90)

Technical Lead at Ain Finance

Technical Lead and Software Architect focused on distributed systems, microservices, fintech architecture, cloud-native systems, and scalable backend engineering.

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