Linux平台MySQL的有关目录：
| 目录 | 描述 |
|---|---|
| /usr/bin | 客户端和脚本 |
| /usr/sbin | MYSQLD服务器 |
| /usr/lib/mysql | 库 |
| /usr/share/info | 信息格式的手册 |
| /usr/share/man | UNIX帮助页 |
| /usr/share/mysql | 错误消息、字符集、示例配置 |
| /usr/include/mysql | 头文件 |
| /var/lib/mysql | 日志文件和数据库 |
# 关于MySQL启动与关闭服务的命令分别表示：启动、停止、重启、查看状态
$ service mysqld start | stop | restart | status 查看数据库的引擎情况：
SHOW ENGINES;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)