Category Archives: Logs

Reading the log positions of a snapshot consistently

MySQL 8.0.11 introduced a new performance schema table named log_status, which provides consistent information about MySQL server instance log positions from replication and transactional storage engines.

Used in conjunction with other MySQL 8.0 feature (the backup lock), this new feature will allow backup tools to take backup with minimal impact in DML throughput, but ensuring consistent snapshot with respect to GTIDs, replication, binary logs and transactional storage engine logs.…

“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.…