Have you experienced a hell-level interview? The bloody lesson tells you
Hello, Mr. X, welcome to our company for an interview, do n’t be too nervous, let ’s talk a little
Ok, thank you
After reading your resume, I know a lot about the mysql database. Let's talk about the database first.
Well, mainly used in the company before the business is the mysql database, and do ...... (omitted here a million words of the service description)
That has indeed been done a lot in business, can you talk to me about mysql index implementation?
The index is a data structure that quickly finds data. It is used almost every day in work. The underlying data storage structure is a B + tree
Then, is there anything else?
Is to use the index as much as possible when querying the index
Then let me talk about why the data structure is a B + tree
... Sorry, I have n’t touched this much
Then tell me what is called back table, index coverage, leftmost match, index pushdown
Is this the knowledge point of the index?
Okay, let's be practical. What optimizations have you made using indexes in your work?
Don't use select *, try not to use like fuzzy matching,
Like fuzzy matching will not take the index?
Shouldn't it
......
A bunch of questions are omitted here
There is already a paste in my head
This is a bloody interview in hell level. Can you answer all the interview questions I asked above?
When I came out of the interview building, my head was still drowsy. You do n’t know what I experienced at all. I interviewed a development position, not a DBA. It ’s necessary to ask me so much.
Later, I consulted my mentor: Mr. Ma Soldier , he said so. Now the employment competition is fierce. When investigating technology, not only stay at the application level, you also need to understand the underlying principles. Only when you can't control the problem can you solve it with ease.
Later, I learned that there is a mysql training camp recently by Teacher Ma here to fully improve the programmer's internal skills. Immediately registered, I hope everyone will also sign up to study together, and the province will be destroyed like me.
Extraneous sound
It only costs 2 cents to participate, and many contents are launched on the whole network, and answer questions on the spot with the teacher.
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Horse Soldier Education was founded by a horse soldier teacher
Who is the horse soldier?
Horse soldier teacher
Graduated from Tsinghua University in 1999, from programmer to CTO, he has been committed to promoting Java, big data, and AI to take root in China. Its set of advanced java is very popular, and there are 10 million times of learning.
Course price: The original price is 299, and the fans of this number only need 0.02 yuan.
Narrator: 2 cents can't buy a loss, can't be fooled.
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In two days of training camp, you will learn:
title:
1. Master the mysql index system from 0 to 1
2. The choice of data structure in the index system
3. Classification and application scenarios of the index
4. The difference between different storage engine indexes and data storage methods
5. Knowledge points hidden in the index: index back to the table, cover index, index push down
6. How to create an index with optimal performance
7. Index optimization
Training camp time :
April 21 - April 22 , 20:00
The training camp is broadcast live online for only 2 cents, and you can also get free preview materials .
Receive preview information
Scan the code to add WeChat to receive preview materials, limited to the top 200
If you encounter frequent scans, please re-identify
(The value of content depends on your actions, don't be a collector)
In addition, the participating partners can get the book "Multithreading and High Concurrency", free mail :
Participate in the live broadcast class, and have the opportunity to receive the grand prize. The prizes are:
Again, scan the code:
(1) Free preview materials;
(2) Participate in the training camp and lead the horse soldier teacher's latest [design mode]
(3) Participate in small games and get the book " Multithreading and High Concurrency ";
(4) Participate in live broadcast courses and draw prizes for free;
Scan the code to add WeChat to receive preview materials, limited to the top 200
If you encounter frequent scans, please re-identify
(The value of content depends on your actions, don't be a collector)
Identify the " two-dimensional code " above , 0.02 yuan to buy lessons, 4 hours, worth it!
