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feat: add recommendation on indexes in unique columns #6553

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Jan 9, 2025
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feat: add recommendation on indexes in unique columns #6553

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eb3c879
feat: add recommendation on indexes in unique columns
ankur-arch Dec 26, 2024
46e5833
Merge branch 'main' into extra-indexing
jharrell Jan 9, 2025
80029e2
Merge branch 'main' into extra-indexing
jharrell Jan 9, 2025
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1 change: 1 addition & 0 deletions content/700-optimize/300-recordings.mdx
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Expand Up @@ -45,6 +45,7 @@ When a recording session ends, Optimize generates recommendations such as:
- [Using `@db.Char(n)`](/optimize/recommendations/avoid-char)
- [Using `@db.VarChar(n)`](/optimize/recommendations/avoid-varchar)
- [Using `timestamp(0)` or `timestamptz(0)`](/optimize/recommendations/avoid-timestamp-timestampz-0)
- [Indexing on unique columns](/optimize/recommendations/indexing-on-unique-columns)
- [Long-running transactions](/optimize/recommendations/long-running-transactions)
- [Unnecessary indexes](/optimize/recommendations/unnecessary-indexes)

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17 changes: 17 additions & 0 deletions content/700-optimize/400-recommendations/1300-indexing-on-unique-columns.mdx
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@@ -0,0 +1,17 @@
---
title: 'Indexing on unique columns'
metaTitle: 'Optimize recommendations: Indexing on unique columns'
metaDescription: "Learn about the recommendation provided by Optimize regarding indexing on uniquely constrained columns."
tocDepth: 3
toc: true
---

Optimize identifies redundant indexing on unique columns and provides recommendations for better database performance.

### Why this is an issue

Unique constraints inherently enforce uniqueness by generating an underlying index. Adding an additional index to the same column is unnecessary and can lead to extra overhead.

This redundancy increases write costs and slows down updates, as the database must synchronize multiple indexes.

This guideline applies broadly to relational databases like PostgreSQL, MySQL, MariaDB, SQLite, and SQL Server, which automatically create indexes for unique constraints.
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