It is said that programmers have high salary and good treatment. In 2022, gold, nine and silver are coming. Is your small goal 30K, 40K, or 20K with 16 salary? As a Java development engineer, when the ability can meet the company's business needs, it is not difficult to get an offer that exceeds expectations. However, what is the fastest and most effective way to improve Java core competencies, and what is the short-term promotion and salary increase?
First of all, you need to jump out of your daily work and get in touch with more in-depth and cutting-edge top-level projects. A simple logic: The reason why big factories can give salaries higher than the industry standard is precisely because even ordinary developers have to deal with many complex scenarios. These complex scenes and projects are like "the world outside the wall". If you haven't seen or touched them, you can't carry out systematic learning and establish cognition, and technical barriers will naturally appear.
Therefore, if you expect to achieve income growth and job promotion through personal efforts, the best way must be to learn more and see more.
A database is a comprehensive system, behind which is the database theory developed over several decades. Maybe you think the database is not difficult, because you can write SQL proficiently, and you can play with ease in various clients. But take the most common MySQL as an example, as a programmer, have you ever encountered similar problems in the process of using MySQL:
- Why is my count(*) so slow?
- Why did I create an index but it didn't work at all?
- Why is it so slow that I only check the statement of -line?
- How to optimize MySQL for large tables?
Before, you probably solved problems by searching for other people's experiences. Have you ever thought that if you can understand the working principle of MySQL, then when you encounter a problem, can you directly pinpoint the essence of the problem? For example, if you know the implementation principle of the index, you will encounter an index problem Can you infer possible solutions from the point of view of principle? MySQL and optimization have always been frequently asked questions in interviews with big companies such as Ali, Meituan and so on, and many Java interviewers have asked for this Bend down!
So how to learn MySQL and optimization
To sum up, it is because of the lack of systematic understanding of MySQL and optimization, or the lack of understanding of the principle. Here, I recommend a necessary document for MySQL and optimization learning and several series of questions that must be asked and analyzed in the interview of the big company MySQL for everyone!
A must-have document for MySQL
This document is divided into three modules. ** Starting from MySQL theory, it will take you to establish a knowledge framework, and then break through each core technical field of MySQL one by one.
The first template: MySQL theory
The second template: MySQL performance optimization articles
The third template: MySQL Architecture System
Content display:
Analysis of high-frequency test sites in MySQL interviews
MySQL high frequency test site
- How to choose ordinary index and unique index?
- Why does MySQL sometimes choose the wrong index?
- How to add an index to a string field?
- Why does my MySQL "shake" a bit?
- Why is half of the table data deleted, but the table file size remains the same?
- count(*) is so slow, what should I do?
- How does "order by" work?
- How to display random messages correctly?
- Why do these SQL statements have the same logic, but the performance is very different?
- Why is the execution of the statement I only check-line executed so slow?
- What is phantom reading and what's wrong with phantom reading?
- Why do I only change one line of the statement and lock so many?
- What are the ways for MySQL to "quench thirst" and improve performance?
- How does MySQL ensure that data is not lost?
- How does MySQL ensure master-slave consistency?
- How does MySQL ensure high availability?
- Why is the standby database delayed for several hours?
- There is a problem with the master library, what should I do with the slave library?
- What are the pits of read-write separation?
- How to tell if there is a problem with a database?
- After accidentally deleting the data, what else can I do besides running away?
- Why is there a statement that cannot be killed?
- If I check so much data, will it blow up the database memory?
- Is it possible to use join?
- How to optimize the join statement?
- Why can temporary tables be renamed?
- When would an internal temporary table be used?
MySQL and optimized video parsing
testimonials
Back-end engineers who master MySQL are also becoming more and more sought-after, and not only business departments and infrastructure departments are also vying for people on a large scale. Mastering MySQL and optimization technology is not only a necessary skill for you to enter a large factory , but also the only way for you to become a senior engineer, senior engineer or architect.