Øystein Grøvlen

Øystein Grøvlen has asked 0 questions and find answers to 6 problems.

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I am Senior Principal Software Engineer in the MySQL Database Service Team at Oracle. I earlier worked for 3 years in the Database Team at Alibaba. Before that, I worked for 9 years in the MySQL optimizer team.

Øystein Grøvlen questions

Øystein Grøvlen answers

Why MySQL optimizer doesn't use all columns index?
Percona 5.7 Slow on many Joins
Why did changing from utf8 to utf8mb4 slow down my database?
Why PostgreSQL queries are slower in the first request after first new connection than during the subsequent requests?
Incorrect result when select count distinct with order by and math function in MySQL 5.7.17