The MySQL sys schema, which is fully enabled in Azure Database for MySQL 5.7, provides a powerful collection of user friendly views in a read-only database. Building on the MySQL Performance and Information Schemas, you can use the MySQL sys schema to troubleshoot performance issues and manage resources efficiently.
The MySQL Performance Schema, first available in MySQL 5.5, provides instrumentation for many vital server resources such as memory allocation, stored programs, metadata locking, etc. However, the Performance Schema contains more than 80 tables, and getting the necessary information often requires joining tables within the Performance Schema, as well as tables from the Information Schema. Let’s look more closely at how to use the MySQL sys schema.
Read about it in the Azure blog.