After reviewing MySQL for a month, I was stunned when the interviewer of Alibaba asked me

As Java Programmers believe that everyone MySQL The index of is no stranger , Indexes (Index) Help MySQL Data structure for efficient data acquisition . Index as MySQL The key knowledge in , In the interview frequency is particularly high . I think I am right about MySQL I know a lot about index knowledge , My colleagues also call me big man in their work .

To get into Ali , I spent it specially 1 About a month to review the relevant knowledge , Confidently, I wrote on my resume “ Master MySQL”, I didn't expect to be severely abused by Ali's interviewer … I had a good time talking with the interviewer in the first half , Chatting, I mentioned that our business volume is relatively large , There are millions of new data generated every day , The interviewer is interested in ......... interviewer ： You have so much data every day , Are they all stored in a relational database ？ I ： Yes , What we use online is MySQL database . interviewer ： Have you done some optimization for queries ？ I ： We used the index .

I thought I could easily answer the interviewer's questions , But the next question directly confused me

You know it's MySQL 5.6 in , What optimizations have been made to the index ？

So many indexes you create , Is it effective , Or your SQL Have you ever used index to query statements ？

When we did the investigation , Is there any way to know if there is index query ？

What happens when an index is explicitly created , But the execution did not pass the index ？

Oh , Let's ask so much about index for the time being . What is the transaction isolation level of your online data ？

I can only answer a few of the above questions with hesitation , Watching the interviewer gradually lose the enthusiasm to ask me questions, I know I should be cold in this interview , As everyone expected, I didn't get Ali's offer, I thought I had done enough preparation, but I still underestimated the difficulty of Ali's interview , After this interview, I went back and asked my good friend in Tencent for a job MySQL Learning notes of , And I'm going to have an interview with ALI this time . In line with the principle that good things should be taken out and shared, and in order to let everyone learn better MySQL I decided to take this MySQL The notes are shared for free , This note is from Mysql From foundation to optimization to architecture , Now I'll take a screenshot to show you this information , I think this information is good. If you need friends, please praise, pay attention and support , Follow me and send a private message “MySQL” You can get information for free

Part1：MySQL The brain map of learning thinking （ Hand painted version ）

​Part2：MySQL Base part （ Core ） ① know MySQL and SQL introduction （MySQL Use of + Sample database + Database basic terminology +MySQL+ With the client program MySQL Interaction skills ）

​

② Use SQL Management data （MySQL Server's SQL Pattern +MySQL Identifier syntax and naming rules +SQL The case of the letters in a statement + Character set support, etc ）

③ data type （ Categories of data values +MySQL Data type of +MySQL How to deal with illegal data values + Sequence + Expression evaluation and type conversion + The choice of data type ）

④ Storage program （ Compound statements and statement separators + Stored functions and stored procedures + trigger + event + Security of stored programs and views ）

⑤ Query optimization （ Use index +MySQL Query optimizer for + Selecting data types to improve query efficiency + Load data effectively + Scheduling and locking problems + Optimization done by the system administrator ）

​

Part3：MySQL Lifting technology （ Advance quickly ） ①MySQL Programming interface （MySQL Programming ）

②MySQL System management （MySQL Introduction to system management +MySQL Data directory for +MySQL Daily database management system + Controls and security +MySQL Database maintenance 、 Backup and replication ）

​

Part4：MySQL performance optimization （ Optimize the material ） ①SQL Optimize （ Introduction to optimization +SQL The basic idea of sentence optimization ）

②SQL Optimize skills （ utilize Explain Analyze query statements + utilize Profiling Analyze query statements + Using indexes properly + Different types of SQL Sentence optimization method + Optimize database structure + Analysis of the table 、 Checklists and optimization tables ）

③ Query performance optimization （ Why is the query speed slow ？+ Slow query Foundation ： Optimizing data access + How to refactor the query + The basis of query execution +MySQL Limitations of the query optimizer + Query optimizer tips + Optimize specific types of queries ）

​​ I think this information is good. If you need it, please praise it, pay attention and support the sending of background private messages “MySQL” You can get this information for free

④MySQL Performance optimized 21 Best practice

​

​

Part4：MySQL Architecture Technology （ In the enterprise MySQL High availability architecture ） ① What is? MySQL High availability ？

​

②MySQL Master slave copy （MySQL Master slave architecture design + Configuration environment + Server installation configuration +LVS Installation configuration ）

​

③MySQL+DRBD+HA（ What is? DRBD?+MySQL+DRBD+HA Architecture design + Configuration environment + Installation configuration Heartbeat+ Installation configuration DRBD）

​

④Lvs+Keepalived+MySQL Single point write master master synchronization scheme （ Configuration environment +Lvs+Keepalived Installation , To configure +Master and Backup Start of ）

​

⑤MMM High availability MySQL programme （MMM The architecture of + Configuration environment +MMM Installation +Monitor Server configuration + Configuration of each database server +MMM Management of ）

​ I think this information is good. If you need it, please praise it, pay attention and support the sending of background private messages “MySQL” You can get this information for free