Shulou(Shulou.com)06/01 Report--

MySQL knowledge, why is MySQL so difficult to learn? Many people don't know much about it. Today, in order to let you know more about MySQL, the editor summarizes the following contents. Let's look down together.

As a back-end developer, the use of MySQL is essential, and reasonable use of indexes and index tuning is one of the skills that back-end developers must master. Unreasonable use of indexes accounts for most of the daily database problems.

MySQL is one of the most commonly used relational databases at work, and it is also a knowledge point that must be asked in the interview. After we learned to build a database, create tables and other basic operations, we stopped the whole in-depth study and specialized research of MySQL.

But with the rapid development of Internet business. The requirements for indicators such as high concurrency and high availability of the database are getting higher and higher, so at this time, the underlying mechanisms and principles are gradually paid attention to by people.

Therefore, many front-line Internet companies for the database mechanism principle is the interview must ask the content.

For example, when you go to an interview, the interviewer asks you:

1. What is the nature of the index?

2. Do you know anything about Samsung Index? How do you understand it?

3. How does the Innodb engine ensure the concurrent processing of transactions?

4. What is the longest execution time of SQL in your company? Have you analyzed the reason? What is the way to solve the problem? Wait a minute.

At this time, you will look confused and be abused by the interviewer. The friends who have not answered the above questions correctly should reflect on themselves. after all, this is the knowledge point that must be asked in the front-line Internet interview.

Is MySQL so important? Oh, is it difficult to learn? Personally, I think MySQL can break through the bottleneck by mastering the following knowledge.

1. Master the overall architecture of MySQL and understand the characteristics of the major storage engines with MySQL characteristics.

2. Go deep into the indexing mechanism of MySQL, so that every SQL executes the process of building data search in mind.

3. Understand the execution path of a SQL statement in MySQL and the significance of each link. Forms a standard timing for SQL execution.

4. Understand the transaction, lock, Redo/Undo, MVCC and other mechanisms of MySQL Innodb engine. Fully understand the excellent design of Innodb engine and so on.

These are the MySQL knowledge points, why MySQL is so difficult to learn a brief introduction, of course, the detailed use of the above differences have to be used by everyone to understand. If you want to know more, welcome to follow the industry information channel!

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