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MySQL Performance Optimization Guide for Non-Specialists: Beginner to Advanced (SQL Tuning Edition)

I've created the 'MySQL Performance Optimization Intro/Practical (SQL Tuning Edition)' course, easy for non-majors to understand and immediately applicable in practice!

(5.0) 129 reviews

1,220 learners

  • jscode
이론 실습 모두
취준생
비전공자
MySQL
DBMS/RDBMS
query-tuning
SQL

Reviews from Early Learners

What you will gain after the course

  • Self-directed SQL statement tuning methods

  • Practical Index Techniques

  • MySQL Performance Improvement Methods

  • Practical DB Performance Improvement Methods

  • Identifying SQL Performance Bottlenecks with Execution Plans


🤬 Damn it, 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 active 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 quite a few points that I found difficult. First, there were too many difficult and unfamiliar terms. B+Tree, covering index, full table scan, random access, and many other unfamiliar terms made me feel resistant to learning.

I overcame this reluctance and managed to read through books related to performance improvement, but there were not 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 such difficulties, 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 the Course

Now that we've learned the concepts, we need to directly experience actually tuning SQL statements by utilizing those concepts. To do that, we need sufficient examples to practice SQL tuning. So I've prepared a total of 17 practical examples.

We'll carefully select and teach you only the core concepts you actually need for performance improvement. Just knowing a few commonly used concepts will be more than enough for performance optimization. We won't teach you unnecessary concepts. By learning this way, you can learn really quickly and apply it directly in real-world situations.

I thought that if you can't apply what you've learned in real situations even after completing the entire course, then it's a poorly designed course. I tried to structure it as a practical course that can be immediately applied to real work, rather than an academic approach that focuses on deep theoretical learning.

We won't just explain theory, but will show you every step of the performance improvement process using examples. By showing you this improvement process, you can easily learn what steps you can take to improve DB performance in real-world situations.

👍 Great for these types of people!

Someone who is having difficulty
learning MySQL performance optimization by watching
YouTube or reading blogs

Someone from a non-major background who
has slow understanding of
difficult concepts and terminology

Those who want to directly diagnose inefficient parts of SQL in real-world work and personally improve performance

🙊 After completing this course?

You will be able to identify on your own what factors are causing specific SQL statements to perform slowly. And you will be able to directly achieve meaningful performance improvements.

🍡 Tasting

'What is an Index?' lesson

'Understanding MySQL Structure for Performance Improvement / Core of SQL Tuning' Class

[[STRONG_1]]'[[/STRONG_1]][실습] 좋아요 많은 순으로 게시글 조회하는 SQL문 튜닝하기[[STRONG_2]]'[[/STRONG_2]] 수업 中

Reference Notes

The course proceeds under the assumption that you have basic knowledge of SQL statements. Therefore, we recommend taking this course after you have learned basic SQL statements. If you encounter any parts that are difficult to understand while studying, please feel free to ask questions immediately using the Q&A board or 1:1 open chat room😊

🚨 Make sure to check what kind of person is providing the education!

If you meet the wrong doctor, you might face death because your illness cannot be cured at that moment. However, death ends with the pain of that moment. But if you meet the wrong teacher and receive poor education, you will suffer throughout your entire life.

Poor education can lead you to unwanted companies, smaller salaries than expected, and a lifetime of suffering. Not only that, but the wrong education you received can be passed down to your children as well.

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

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

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

Hello!

I started studying development as a non-major. I've already become a 6-year developer! Recently, I worked as a developer while serving as CTO at two companies. Whenever I had time, I've been doing coding lectures, company development consulting, and presentations.

The number of students I've taught has now exceeded 24,000 (as of July 2025)! Every time I teach various students, I always feel the same way - I can't forget the sense of fulfillment from education, so I plan to continue providing education consistently on Inflearn.
(* Students who passed interviews at Kakao Pay, Yanolja, and Woowa Brothers among my learners)

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

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

Thank you!

🏆 Course Best Review

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


🚌 Feeling overwhelmed about what order to take the courses?

'[2025] Essential Curriculum for Getting a Job as a Backend Developer (IT Service Companies)' Please refer to this!



🐶 Get Course Discounts with Roadmaps

➡ Performance optimization for large-scale traffic handling (https://inf.run/ecBS1)

Recommended for
these people

Who is this course right for?

  • Backend Developer seeking IT service firm roles

  • Job seeker seeking unique qualifications

  • MySQL Performance Improvement: Hands-on?

  • Those needing to improve DB performance in their practical work.

  • Those who want to learn SQL tuning

  • For those who want to directly analyze and fix slow SQL.

Need to know before starting?

  • SQL query

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Curriculum

All

39 lectures ∙ (2hr 42min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

129 reviews

5.0

129 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 486

    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!

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