---
title: "Hash Index — Database Glossary | Xata"
description: "An index using a hash function for exact-match lookups only. Faster than B-tree for simple equality queries on high-cardinality columns. Does not suppor..."
source: "https://xata.io/glossary/hash-index"
---

# Hash Index

Indexing

An index using a hash function for exact-match lookups only. Faster than B-tree for simple equality queries on high-cardinality columns. Does not support range queries. WAL-logged since PostgreSQL 10.

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