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45 SQL Tuning Techniques You Can Use Right Away in Practice

A DBA instructor with 30 years of experience teaches 45 essential SQL tuning techniques that can be immediately applied in practice through real-world examples. Master the practical know-how to make slow queries 10 times faster, from execution plan analysis to index optimization and join tuning!

(4.8) 4 reviews

77 learners

Level Basic

Course period 12 months

  • codingkorea
sql튜닝
sql튜닝
오라클튜닝
오라클튜닝
오라클
오라클
튜닝
튜닝
sql
sql
SQL
SQL
Oracle
Oracle
Data Engineering
Data Engineering
sql튜닝
sql튜닝
오라클튜닝
오라클튜닝
오라클
오라클
튜닝
튜닝
sql
sql
SQL
SQL
Oracle
Oracle
Data Engineering
Data Engineering

Reviews from Early Learners

What you will gain after the course

  • # How to Analyze SQL Execution Plans and Optimize Performance ## Understanding Execution Plans An execution plan is a roadmap that shows how the database engine processes a query. It reveals which indexes are used, how tables are joined, and the order of operations. ### How to View Execution Plans **MySQL:** ```sql EXPLAIN SELECT * FROM users WHERE email = 'user@example.com'; EXPLAIN ANALYZE SELECT * FROM users WHERE email = 'user@example.com'; ``` **PostgreSQL:** ```sql EXPLAIN SELECT * FROM users WHERE email = '

  • Practical SQL Optimization Skills Using Index and Join Tuning

  • How to Write SQL Efficiently for Big Data Environments

Oracle SQL Tuning Complete Guide: 45 Practical Examples for Immediate Use in Real-World SQL Tuning


Hello, everyone!

Thank you sincerely for choosing the "45 Practical SQL Tuning Examples for Real-World Use" course.

This course is composed of 45 core examples that have been refined and perfected through multiple lectures, based on SQL tuning cases I've directly experienced in the field. I've carefully selected only the essential content that beginners learning SQL tuning must know.

Why is SQL tuning important?

In real-world scenarios, I frequently see cases where a single SQL query slows down the entire system. Tasks that took 10 minutes can be reduced to 10 seconds after tuning, and situations where server expansion was being considered can be resolved by fixing just one SQL query.

Even with SQL queries that produce the same results, performance can differ by tens or even hundreds of times depending on how they're written. This is the power of SQL tuning. Before investing massive amounts in hardware, if you can solve the problem with SQL tuning alone, there's no more efficient approach than that.

Furthermore, SQL tuning skills go beyond simply making queries faster—they represent expertise in understanding the internal workings of databases and optimizing the entire system. Professionals with these capabilities are always welcomed in the field.

This course is especially recommended for the following people.


Strongly recommended for these people

✔️ Those who know basic SQL but are new to performance optimization
✔️ Those who want to properly learn how to read execution plans
✔️ Those preparing to transition from developer to DBA
✔️ Those struggling with slow queries in their current work
✔️ Those who want to pursue a career as an SQL tuner


To be honest, I only learned about SQL tuning as a skill after I started working in the field. Looking back now, I regret not knowing about this technology even a little bit earlier. That's why I prepared this course with the hope that you all could learn this important skill faster and more systematically. This skill is absolutely essential anywhere databases are used. It will be especially useful for those preparing for careers as DBAs, DB engineers, or SQL tuners.

The lecture examples and theory have been systematically organized in my GitBook. You can follow along step by step by watching the videos together with the GitBook materials.

Starting from Oracle installation and environment setup, learn through 45 tuning examples step by step, and I hope SQL tuning techniques will give wings to your SQL skills.

All examples and theories from this course are systematically organized in GitBook.

  • Course examples and theory are systematically organized in GitBook

  • GitBook materials and videos together enable step-by-step learning

  • From Oracle installation and environment setup to 45 complete tuning examples


🚀 Here's how you'll improve after taking the course

✅ You can immediately identify the problem when looking at slow SQL
✅ You can determine the direction for performance improvement just by looking at the execution plan
✅ You get a sense of when and how to utilize indexes
✅ You can understand performance differences based on join methods and optimize them
✅ You can confidently perform SQL tuning in real-world situations


You can check the employment status of those who have taken my Oracle courses including SQL tuning and got jobs at the following link.

https://cafe.daum.net/oracleoracle/SDMs/441


Start right now!
Master SQL tuning skills with 45 examples - this is your opportunity to upgrade your career to the next level.

After completing this course, you will gain these abilities

1. You'll learn how SQL is processed in the database


2. You can directly control SQL execution plans


3. You'll learn about index structures that improve search speed


4. You'll learn about 6 index scan methods


As you move on to the advanced units, you'll also gain the following tuning abilities.


5. You'll be able to tune simple join queries

When you change the join order, you can directly see how much the performance differs. By comparing buffer usage, you find the optimal join method.

6. You'll be able to tune advanced join statements

I learned 3 join methods through diagrams and examples, so I structured it to enable you to do the tuning yourself.

7. You'll be able to tune subquery statements

I'll provide you with tuning methods for slow subqueries in big data environments.

8. You'll be able to perform SQL tuning using data analysis functions

When tuning with hints alone isn't enough, I'll teach you how to tune by rewriting SQL.

Important Notes Before Enrollment

Practice Environment

  • What you need: Just bring your laptop!

    • # Oracle Database Installation Guide This guide provides step-by-step instructions for installing Oracle Database on your system. ## System Requirements Before beginning the installation, ensure your system meets the following requirements: ### Hardware Requirements - Minimum 2GB RAM (4GB or more recommended) - At least 10GB of available disk space - 1GHz or

    • All example SQL scripts provided

    • Providing Sample Data for Practice

    • Configured to follow along directly on a personal PC

Learning Materials

Prerequisites

  • Understanding Basic SELECT and JOIN Syntax

💡2025 Freelance SQL Tuner Income Survey (Based on 2024-2025 IT Consulting Market M.M Unit Price Standards)

This unit price information is compiled from the following sources and written to be realistic and more conservative:

- Wishket "2025 Freelance Developer Rate Survey by Years of Experience"

- IT Union Freelancer Rate Sharing Board (2024~2025)

- Analysis of Financial Sector Freelance Job Postings (Wanted Gigs, I'm Job, Freemoa)

- Korea Software Industry Association SW Engineer Average Wage Survey (2024)

- Actual contract cases from IT communities such as OKKY, Jobkorea, and Clien

The above rates are based on statistical data from relevant organizations and communities for 2024-2025, and actual contract amounts may vary depending on individual capabilities and project circumstances.

The World of a Professional Tuner:

1. Tuner's Vision (Students' Wannabe)

"Why should you learn tuning?" It's a slightly harder path than others, but at the end, there's a definite reward waiting for you.

① Treatment as a professional expert like 'Gap (甲)', not 'Eul (乙)'

  • General Developer: Strongly positioned as an 'executor' who must implement features according to customer requirements.

  • SQL Tuner: The 'system doctor' that desperate customers bring in, pleading "Please save us" when their systems freeze or slow down. Rather than coding at someone else's direction, they possess 'technical authority' to diagnose problems and propose solutions.

② Increasing Value with Age (Long-run)

  • Many developers face pressure to move into management (PM) roles once they reach their mid-40s.

  • However, tuning is different. The 'experience (Insight)' itself gained from resolving countless issues is your skill. It's almost the only profession where you can work actively until your 60s without retirement, where the more gray hair you have, the more you're welcomed with "An expert has arrived".

③ Overwhelming 'Return on Time Investment' (High Efficiency)

  • Rather than being stationed throughout the entire project, they are deployed only during critical periods (3-6 months) such as performance testing or just before launch to resolve issues.

  • Work short and intensely (Spot), earn high income, and live a flexible life where you control your own time.

Recommended for
these people

Who is this course right for?

  • Developer seeking to resolve database performance issues

  • Data analysts and engineers interested in SQL tuning

  • Anyone who wants to learn efficient data retrieval SQL in big data environments

Need to know before starting?

  • Basic SELECT Statement

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Answers

4.9

Rating

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Curriculum

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49 lectures ∙ (10hr 25min)

Published: 
Last updated: 

Reviews

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4 reviews

4.8

4 reviews

  • shs613229878님의 프로필 이미지
    shs613229878

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    Average Rating 4.0

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      Yes ~ Thank you so much. ^^

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    damuri15065

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    5

    39% enrolled

    I'm learning a lot from the great lectures + prepared practice examples + exercises. Thank you!

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