As a back-end developer, the use of MySQL is essential. Proper use of indexes and index tuning are one of the skills that back-end developers must master. Among daily database problems, unreasonable use of indexes accounts for the majority.
MySQL is one of the most commonly used relational databases at work, and it is also a must-ask question in interviews. After we learned the basic operations of building a database and creating a table, we stopped the entire in-depth study and research of MySQL.
But with the rapid development of Internet business. The requirements for high concurrency, high availability and other indicators of databases are getting higher and higher, so at this time, the underlying mechanisms and principles are slowly being valued by people.
Therefore, for many first-tier Internet companies, the mechanism and principles of the database are a must-ask question in interviews.
For example, when you go for an interview, the interviewer asks you:
1. What is the essence of indexing?
2. Do you know the Samsung index? How do you understand it?
3. How does the Innodb engine ensure concurrent processing of transactions?
4. What is the longest execution time of your company’s SQL? Have you analyzed the reasons? What is the solution? Wait~
At this time, you will look confused and be tortured by the interviewer. Friends who have not answered the above questions completely correctly should reflect on it. After all, this is a knowledge point that must be asked in front-line Internet interviews!
Is MySQL so important? , is it difficult to learn? I personally believe that 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 featured by MySQL.
2. Go deep into the indexing mechanism of MySQL so that every SQL execution can build the data search process in your mind.
3. Understand the execution path of a SQL statement in MySQL and the importance of each link. Form a standard timing sequence for SQL execution.
4. Understand the transaction, lock, Redo/Undo, MVCC and other mechanisms of the MySQL Innodb engine. Fully understand the excellent design of Innodb engine, etc.
If you can answer the above four interview questions, you are welcome to pay attention and leave a message in the comment area!
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