In MySQL NDB Cluster, the management node (ndb_mgmd) is a lightweight process that among other things handles the configuration of the cluster. Since it is lightweight. It can be tempting to install it with one of the other nodes. However, …

MySQL NDB Cluster: Never Install a Management Node on the Same Host as a Data Node Read more »

The Performance Schema and sys schema are great for investigating what is going on in MySQL including investigating performance issues. In my work in MySQL Support, I have several times heard questions whether a peak in the InnoDB Data File …

What Does I/O Latencies and Bytes Mean in the Performance and sys Schemas? Read more »