My error report is like the following picture

The prompt is as follows: an error is reported

 2021-12-26T12:28:24.321789Z 0 [System] [MY-010116] [Server] C:\mysql-8.0.26-winx64\bin\mysqld.exe (mysqld 8.0.26) starting as process 8168
2021-12-26T12:28:24.323688Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
2021-12-26T12:28:24.335659Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2021-12-26T12:28:24.337392Z 1 [ERROR] [MY-012271] [InnoDB] The innodb_system data file 'ibdata1' must be writable
2021-12-26T12:28:24.337508Z 1 [ERROR] [MY-012278] [InnoDB] The innodb_system data file 'ibdata1' must be writable
2021-12-26T12:28:24.337618Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2021-12-26T12:28:24.337878Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2021-12-26T12:28:24.337978Z 0 [ERROR] [MY-010119] [Server] Aborting
2021-12-26T12:28:24.338395Z 0 [System] [MY-010910] [Server] C:\mysql-8.0.26-winx64\bin\mysqld.exe: Shutdown complete (mysqld 8.0.26)  MySQL Community Server - GPL.

Reason guess:

The MySQL service is always turned on (it starts automatically after startup), so when it is turned on, an error will be reported when the command line is started

Solution:

Enter the command prompt in administrator mode and enter the following command to close the MySQL service

net stop mysql

So far, the problem has been solved. Entering mysqld — console again will open the MySQL service normally