Shock! Slow SQL can be optimized to this speed _ I'm not convinced!
Others
2022-05-16 22:20:50
views: 0
Xuan ashamed, who are you?
Xuanxuan, whose real name is Luo Longjiu, is an Alibaba Cloud DBA expert, responsible for the online stability of Alibaba Cloud RDS and the expert service team, known as "Master"!
He has gone through Alibaba's double 11 test over the years, and has accumulated 6 years of rich experience in operation and maintenance, tuning, and diagnosis of Alibaba Cloud database users.
He is the creator of this challenge!
After his optimized slow SQL, it only takes ****9 ms to execute (specifically, for every 100 additional replies, the landlord will disclose a single digit, O(∩_∩)O)
This time, we are going to challenge this result! There is no best, only better!
1. The challenger needs to optimize the slow SQL provided by the organizing committee in the designated database environment.
2. The challenger needs to send the optimized SQL email to the landlord ([email protected]), which will be reviewed by the database expert team. The subject of the email is [Yunqi Community Nickname + Slow SQL Challenge]. Then you need to reply to this topic with a screenshot of the optimization result. You can update the result unlimited times. The final result is based on the result at 12:00 noon on August 24, 2017.
3. Challengers can call friends and increase the number of likes or replies to their challenge results.
4. Please protect your dignity. Once the data is found to be fraudulent, you will be disqualified from the competition immediately.
1. Favorite this topic.
2. Download the specified SQL to be optimized. Please open it in txt format after downloading.
3. Optimize SQL in the specified environment.
Reminder: You can participate in the competition in the following environments:
1) Self-built MySQL database, optimized SQL;
2) Alibaba Cloud database MySQL version, optimized SQL;
3) If none of the above, you can apply for the Alibaba Cloud free trial package, just need After completing the certification, it can be used for up to half a year. Click here to apply.
4. Reply to [I want to challenge] + screenshot of the optimization result, that is, to participate in the challenge successfully. Just take a screenshot of the results, and please email the optimized SQL to the landlord.
Give a chestnut:
【I want to challenge】+
Note: All prizes will be distributed within one week of the end of the challenge. The owner will contact the winners individually~
What are you waiting for, come and challenge!
================================ I am an elegant dividing line ============= ==========================
The final interpretation right of this challenge belongs to the Alibaba Cloud database team.
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