MySQL Creating databases System Databases
Example
The following databases exist for MySQL's use. You may read (SELECT) them, but you must not write (INSERT/UPDATE/DELETE) the tables in them. (There are a few exceptions.)
mysql-- repository forGRANTinfo and some other things.information_schema-- The tables here are 'virtual' in the sense that they are actually manifested by in-memory structures. Their contents include the schema for all tables.performance_schema-- ?? [please accept, then edit]- others?? (for MariaDB, Galera, TokuDB, etc)
