DBAs’ Inconceivable Tales: A Rare Cause of Replication Lag

Our MySQL support engineers encountered a rather unusual cause of replication lag. We covered the most common causes of replication lag in our previous article about MySQL parallel replication. In this particular case, the root cause was more strange. The servers were very high spec with NVMe disks and 10Gbit Ethernet. Analysis showed that the […]

Sysadmins’ Inconceivable Tales: When All You Have is a Serial Console

Getting a file to a system on which the only access in or out is a serial console.

DBAs’ Inconceivable Tales: Mystery of the Freezing MariaDB Database

How our MariaDB / MySQL Support engineers resolved a mysterious problem of MariaDB freezing every few hours for no apparent reason.

SSM Released

New Shattered Silicon Monitoring (SSM) release is now available with additional features and fixes

MySQL Parallel Replication Pitfalls: Group Commit Sync Delay

MySQL parallel replication is a useful feature, but there are some pitfalls to watch out for. Getting it wrong can cripple performance.

MariaDB / MySQL Performance Tuning

MariaDB and MySQL performance tuning, theory and primer.

SSM – PMM 1.x Fork with Additional Features

SSM is a fork of PMM 1.x with additional features, updates and fixes. Notable new features in the initial release include QAN query harvesting via slow log in RDS, manual node cleanup functionality, and ARM64 builds.

MySQL / MariaDB: Waiting for table flush

Troubleshooting performance degradation caused by pileup of queries stuck in “Waiting for table flush” state in MySQL and MariaDB.

MySQL / MariaDB: Waiting for query cache lock

Troubleshooting performance degradation caused by pileup of queries stuck in “Waiting for query cache lock” state in MySQL and MariaDB.

MySQL – Fixing: Got fatal error 1236 from master when reading data from binary log: log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master;