mysqld is the MySQL server.
configuring the server.
The mysql server, mysqld,has many command options and system variables that can be set at startop t configure its operation.
To determine the command option and system variable values used by the server, execute this comman d;
shell> mysqld --verbose --help
------------The MySQL Data Directory----------
Information managed by the MySQL server is stored under a directory known as the data directory.
原文：https://www.cnblogs.com/zienzir/p/9050786.html