Category Archives: MySQL

“Look: I/O thread is waiting for disk space!”

MySQL 8.0.1 introduced a work with replication threads mutexes in order to improve performance. In MySQL 8.0.2 the same work was extended, focusing in usability, and revamped how replication deals with disk-full conditions, improving the responsiveness of both monitoring commands and administrative commands such as KILL, as well as making status messages much more precise and helpful.…

MySQL 8.0.1 Replication Performance Improvements

MySQL 8.0.1 introduces new features and improvements to replication. The next sections summarize some related to performance.

1. WL#9556 – Writeset-based dependency tracking on the master

Transaction writesets can now be used to evaluate which transactions are independent and can be executed in parallel on the binary log applier on the asynchronous slaves.…

Performance Evaluation: MySQL 5.7 Group Replication (GA Release)

Great news: Group Replication is now officially released with MySQL 5.7.17, congratulations to everybody that worked so hard for it!

In this post I plan to share more details about the performance of Group Replication while addressing one of our frequently asked questions, which is how it performs compared to Galera.…