如何删除mysql和InnoDB中的数据库，因为当我使用DROP DATABASE时，该数据库始终位于表基础信息架构中，并且在尝试重新启动mysql时出现错误。
Operating system error number 2 in a file operation.
2019-07-19T08:17:39.332766Z 1 [ERROR] [MY-012593] [InnoDB] The error means the system cannot find the path specified.
2019-07-19T08:17:39.332774Z 1 [ERROR] [MY-012216] [InnoDB] Cannot open datafile for read-only: './dbtest/users.ibd' OS error: 71