---
title: "Here’s Hash Index Real Purpose in DB2"
description: "We all know that, in DB2, there are different data access methods present. Either by using index are scanning methods. Hash index is a new technique in DB2 V10 .   The concept is not new this is alrea..."
url: https://srinimf.com/2014/12/05/db2-hash-index-functionality/
date: 2014-12-05
modified: 2026-10-10
author: "Srini"
categories: ["DB2"]
tags: ["Db2 Tips", "DB2 Tips and Solutions"]
type: post
lang: en
---

# Here’s Hash Index Real Purpose in DB2

We all know that, in DB2, there are different data access methods present. Either by using index are scanning methods.** Hash index is a new technique in [DB2 V10](https://srinimf.com/2013/05/01/db2-v10-new-access-methodhashing-2-of-2/)**.   The concept is not new this is already being used in Teradata RDBMS and an IMS database.

Related[DB2 for Beginners: What to Know Read Right Away](https://srinimf.com/2019/09/22/frequently-used-top-db2-words/)

## [What is](https://srinimf.com/2016/03/30/how-hash-access-is-faster-than-index-access-in-db2/) the Hash index?

When creating a Table defined with the Hash index, the values in the columns of the Hash index will pass through the hashing algorithm.

Then hashing algorithm will assign a single integer for each value in the hash indexed column. This single integer acts as an index, and data will be stored in a designated storage location. The below figure describes how the hash index works.

![](https://i0.wp.com/srinimf.com/wp-content/uploads/2014/12/68a68-hash2.jpg?resize=469%2C345)

Create table statement-ORGANIZE BY HASH UNIQUE (column-names) HASH SPACE (hash-space-value). This tells DB2 to use a Hash index technique for organizing data of a table.

Unique-Tells that no two values should be the same in hash indexed columns

Hash space-The The amount of fixed hash space pre-allocated for the table.

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