강의

멘토링

커뮤니티

BEST
Programming

/

Database

MySQL Performance Optimization for Beginners/Practical Guide (SQL Tuning Edition) - Easy to Understand Even for Non-Majors

I've created a 'MySQL Performance Optimization Beginner/Practical Course (SQL Tuning Edition)' that's easy to understand even for non-majors and can be immediately applied in real-world situations!

(5.0) 132 reviews

1,253 learners

Level Basic

Course period Unlimited

  • jscode
  • JSCODE
MySQL
MySQL
DBMS/RDBMS
DBMS/RDBMS
query-tuning
query-tuning
SQL
SQL
MySQL
MySQL
DBMS/RDBMS
DBMS/RDBMS
query-tuning
query-tuning
SQL
SQL

Reviews from Early Learners

Reviews from Early Learners

5.0

5.0

Jay Lee

32% enrolled

This lecture is really helpful for me, a newbie in backend development! I don't think there's any other lecture that distills the essentials so well and makes it easy for even non-majors to understand!

5.0

Young

100% enrolled

At first, I thought it was too basic, but as I went on, it definitely helped me with the tuning part! After finishing the practice, the teacher extracted only the main points, so I understood it well without any questions. Thank you. I'm going to watch other lectures.

5.0

쿠카이든

100% enrolled

This was a valuable time to think about SQL performance improvement and tuning from various angles! Thank you for the great lecture~!

What you will gain after the course

  • SQL tuning methods that you can apply while making your own judgments

  • Practical Index Usage Techniques Frequently Used in Real Work

  • Methods to Improve MySQL Performance

  • Practical DB Performance Improvement Methods

  • How to Identify SQL Performance Degradation Factors Using Execution Plans


🤬 Ugh, I can't do this anymore!

I'm Park Jaesung, who started development as a non-major and worked as CTO at various companies, and am currently working as an educator. I also started development as a non-major and had a time when I was studying MySQL performance optimization.

While studying MySQL performance optimization, there were more than just one or two points that felt difficult. First of all, there were too many difficult and unfamiliar terms. B+Tree, covering index, full table scan, random access, and so on—with so many unfamiliar terms, I felt resistance.

I endured and overcame this resistance to finally finish reading books related to performance improvement, but there weren't many examples of how to optimize MySQL performance in different situations. As a result, I didn't know how to actually improve performance in real projects.

Since I also went through these difficulties myself, I thought I should create a MySQL performance optimization course that even non-majors can immediately apply in real-world situations.

✨ 4 Points I Focused on While Creating This Course

Once we've learned the concepts, we need to actually experience tuning SQL statements using those concepts. To do that, we need plenty of examples to practice SQL tuning. So I've prepared a total of 17 hands-on examples.

I've selected only the core concepts you actually need for performance improvement to teach you. Knowing just a few frequently used concepts is more than enough for performance optimization. I won't teach you unnecessary concepts. Learning this way, you can learn really quickly and apply it immediately in real-world situations.

I thought it would be a flawed course if you couldn't apply it in practice even after completing the entire course. I tried to structure it as a practical course that can be immediately applied to real work, rather than an academic approach that deeply studies theory.

Rather than just explaining theory, I'll show you every step of the performance improvement process with examples. By showing you this improvement process, you can easily learn what steps to take to improve DB performance in real-world situations.

👍 This course is great for:

Those who are having difficulty learning MySQL performance optimization by watching YouTube or reading blogs

Those who come from a non-CS background
and are slower to understand
difficult concepts and terminology

Those who want to directly diagnose inefficient parts of SQL in their work and improve performance themselves

🙊 What will you gain after completing this course?

You will be able to identify on your own what factors are causing specific SQL statements to slow down. And you will be able to achieve meaningful performance improvements yourself.

🍡 Preview

'What is an Index?' from the course

'Understanding MySQL Structure for Performance Improvement / The Core of SQL Tuning' from the lesson

'[Practice] Tuning SQL Queries to Retrieve Posts Sorted by Most Likes' lesson

Reference Information

The class proceeds under the assumption that you have basic knowledge of SQL. Therefore, I recommend taking this course after learning basic SQL. If you come across anything you don't understand while studying, please feel free to ask questions right away using the Q&A board or 1:1 open chat😊

🚨 Make sure to check who is providing the education!

If you meet the wrong doctor, you could die from not being able to cure your illness at that moment. However, death ends with that moment of suffering. But if you meet the wrong teacher and receive the wrong education, you will suffer throughout your entire life.

Due to wrong education, you may end up at an unwanted company, receive a smaller salary than expected, and suffer throughout your entire life as a result. Not only that, but the wrong education you received gets passed down to your children as well.

I believe that education can truly change a person's life in a positive way, but on the other hand, it can also completely ruin a person's life. That's how much I think education carries a heavy responsibility.

Therefore, please check who is providing the education, what kind of person they are, what path they have walked, and make a careful judgment.

👋 Hello!
I'm finally introducing myself ( ⸝⸝•ᴗ•⸝⸝ )੭⁾⁾

Hello!

I started studying development as a non-major. Before I knew it, I've become a 6-year developer! Recently, I worked as a developer while serving as CTO at 2 companies. Whenever I had time, I've been doing coding lectures, company development consulting, and speaking engagements.

The number of students I've taught has now surpassed 24,000 (as of July 2025)! Every time I teach my students, I feel it again—I can't forget the sense of fulfillment from education, so I plan to continue teaching consistently on Inflearn.
(* Among students, successful admissions to Kakao Pay, Yanolja, and Woowa Brothers)

Just as I received a lot of help when I was going through difficult and challenging times, I wanted to become someone who could help many others. And I felt most proud and happy when the value I created through development had a positive impact on other people.

For these reasons, I hope that by sharing and giving what I've worked hard to achieve, those people can live a better life.

Thank you!

🏆 Course Best Review

** This is a review written for the previously created course .


🚌 Not sure what order to take the courses in?

Please refer to '[2026] Essential Curriculum for Getting a Job as a Backend Developer (IT Service Companies)'!



🐶 Get course discounts with the roadmap

➡ Performance Optimization for Large-Scale Traffic Handling (https://inf.run/ecBS1)

Recommended for
these people

Who is this course right for?

  • Backend developer seeking employment at an IT service company

  • A job seeker who wants to build a distinctive resume/spec

  • Those who want to try improving MySQL performance themselves

  • People who need to work on DB performance improvement in their actual work

  • For those who want to learn SQL tuning

  • For those who want to directly analyze and fix why their SQL queries are slow

Need to know before starting?

  • SQL statement

Hello
This is

30,294

Learners

2,219

Reviews

744

Answers

4.9

Rating

17

Courses

[Sites] Shortcut to YouTube, Shortcut to LinkedIn [Career] Current) JSCODE - Lead Mentor, CEO / Former) Tripod Lab Co., Ltd. - CTO / Former) Only One Universe Co., Ltd. - CTO / Former) DALY - CTO / Former) Teammate

[Sites]
Go to Youtube
Go to LinkedIn

[Career] Current) JSCODE - Lead Mentor, CEO Former) Tripod Lab Co., Ltd. - CTO Former) Only One Universe Co., Ltd. - CTO Former) DALY - CTO Former) Teammate - CEO [Books] 『Do it! JSCODE's AWS

[Career]
Present) JSCODE - Lead Mentor, CEO
Former) Tripod Lab Co., Ltd. - CTO
Former) Only One Universe Co., Ltd. - CTO
Former) DALY - CTO
Former) Teammate - CEO

[Books]

『Do it! JSCODE's Introduction to AWS』, EasysPublishing (2025.05)

[ETC]
- Corporate development consulting and coding education activities

Curriculum

All

39 lectures ∙ (2hr 42min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

132 reviews

5.0

132 reviews

  • kendrick171799님의 프로필 이미지
    kendrick171799

    Reviews 1

    Average Rating 5.0

    5

    100% enrolled

    At first, I thought it was too basic, but as I went on, it definitely helped me with the tuning part! After finishing the practice, the teacher extracted only the main points, so I understood it well without any questions. Thank you. I'm going to watch other lectures.

    • jscode
      Instructor

      Young-nim~ I think you followed along very well since you understood all the content just from the lecture! I will gain strength and prepare hard for other lectures :) Thank you so much for the course review~ 😊

  • kukaeden님의 프로필 이미지
    kukaeden

    Reviews 489

    Average Rating 5.0

    5

    100% enrolled

    This was a valuable time to think about SQL performance improvement and tuning from various angles! Thank you for the great lecture~!

    • wsde43665님의 프로필 이미지
      wsde43665

      Reviews 24

      Average Rating 5.0

      5

      100% enrolled

      Thank you. I gained some good insights!

      • jscode
        Instructor

        Cheolhyun, you've worked so hard to complete the whole course, and I'm relieved to hear that you've gained some help from it. Thank you for leaving such a great review!

    • soohyunkim9644님의 프로필 이미지
      soohyunkim9644

      Reviews 4

      Average Rating 5.0

      5

      100% enrolled

      It was a practical lecture that could be immediately applied to SQL performance improvement.

      • jscode
        Instructor

        Soohyun, you've worked hard to listen to all the lectures! Thank you for leaving a great review 😊😊

    • ghffu4068032님의 프로필 이미지
      ghffu4068032

      Reviews 2

      Average Rating 5.0

      5

      63% enrolled

      I recommend this lecture if you like learning concepts briefly and then immediately putting them into practice. The conceptual part is taught very briefly, so supplementary study is needed. However, I liked that I could apply it right away. If you study the B-Tree index structure and how MySQL performs index searches and index scans, and then follow along with the practice exercises, you can immediately picture it in your head.

      • jscode
        Instructor

        Hello 13123213! As you mentioned, studying theoretical content in addition to practical exercises will allow you to learn in much greater depth 😊 It seems like you've been balancing supplementary study and lectures well! Be sure to apply what you've learned in real-world situations as much as possible!

    $68.20

    jscode's other courses

    Check out other courses by the instructor!

    Similar courses

    Explore other courses in the same field!