一、information_schema庫
information_schema庫中的表，保存的是Mysql的元數(shù)據(jù)。
官網(wǎng)元數(shù)據(jù)表介紹
InnoDB相關(guān)的表介紹
庫中有表：
+---------------------------------------+
| Tables_in_information_schema |
+---------------------------------------+
| CHARACTER_SETS |
| COLLATIONS |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS |
| COLUMN_PRIVILEGES |
| ENGINES |
| EVENTS |
| FILES |
| GLOBAL_STATUS |
| GLOBAL_VARIABLES |
| KEY_COLUMN_USAGE &
