Category to track posts in PlanetMySQL
Recently, at Percona Live Europe 2019, Dimitri Kravchuk from Oracle mentioned that he observed some unclear drop in performance for MySQL on an ext4 filesystem with the latest Linux kernels. I decided to check this case out on my side and found out that indeed, starting from linux kernel 4.9, there are some cases […]
Read more
Recently I was doing some small testing by using EC2 instances on AWS and I noticed the execution time and performance highly depend on which time of the day I am running my scripts. I was using t3.xlarge instance type as I didn’t need many CPUs and memory for my tests, but from time […]
Read more
Some say that the best password is the one you don’t have to remember. That’s possible with MySQL, thanks to the auth_socket plugin and its MariaDB version unix_socket.
Neither of these plugins is new, and some words have been written about the auth_socket on this blog before, for example: how to change passwords in MySQL […]
In MySQL 8.0.18 there is a new feature called how it works under the hood.
The high-level basics are the following: if there is a join, it will create an in-memory hash table based on one of the tables and will read the other table row by row, calculate a hash, and do a lookup […]
From time to time you may have experienced that MySQL was not able to find the best execution plan for a query. You felt the query should have been faster. You felt that something didn’t work, but you didn’t realize exactly what.
Maybe some of you did tests and discovered there was a better execution […]
