---
title: "DB2 SQL Join: Here are Best Practices"
description: "Top performance tuning tips you need to follow while writing SQL queries using JOINS. Read more."
url: https://srinimf.com/2014/09/15/db2-joins-performance-tuning/
date: 2014-09-15
modified: 2026-10-10
author: "Srini"
image: https://i0.wp.com/srinimf.com/wp-content/uploads/2014/09/pexels-photo-9577508.jpeg?fit=1880%2C1253&ssl=1
categories: ["DB2"]
tags: ["DB2 Joins", "SQL tips and tricks"]
type: post
lang: en
---

# DB2 SQL Join: Here are Best Practices

** List of [performance tuning](https://srinimf.com/2015/05/20/start-tuning-your-db2-sql-query-part-1/) tips in [SQL joins](https://srinimf.com/2023/10/21/12-top-sql-joins-interview-questions/) you need to follow.**

Related[DB2 SQL Query Performance Tuning (1 of 3)](https://srinimf.com/2019/03/17/3-sql-tuning-ideas-on-table-columns-to-apply/)

Related[DB2: Performance Tuning A Quick Tutorial](https://srinimf.com/2015/01/11/top-db2-performance-tuning-interview-questions/)

1. Response time is determined mostly by the number of rows participating in the join
2. Provide accurate join predicates Provide accurate join predicates
3. Never use a JOIN without a predicate
4. Join ON indexed columns Join ON indexed columns
5. Use Joins over subqueries

Related Posts

- [DB2 SQL Query Performance Tuning (3 of 3)](https://srinimf.com/2015/05/20/start-tuning-your-db2-sql-query-part-1/)DateMay 20, 2015
- [DB2: Here is All About Explain Plan](https://srinimf.com/2014/09/23/db2-performance-tuning-explain-plan/)DateSeptember 23, 2014
- [DB2 SQL – Perfect Way to Use Conditions in WHERE](https://srinimf.com/2015/08/10/db2-split-predicates-to-improve-sql-performance/)DateAugust 10, 2015

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