One of great innovation in MySQL 5.7 is memory summary tables в Performance Schema and
corresponding views in sys
And as troubleshooting freak I have huge reason to greet this feature.
Before version 5.7 we had very limited abilities to diagnose memory issues in MySQL. We could use operating system tools, such as vmstat, top, free, but they only showed what MySQL server uses memory, but do not show how. In version 5.7 things changed. …