MYSQL连接方式

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1.TCP/IP 套接字方式

这种方式会在TCP/IP 连接上建立一个基于网络的连接请求，一般是client连接跑在server上的MySQL实例，2台机器通过一个TCP/IP 网络连接。

[root@lucky performance_schema]# mysql -h 192.168.21.210 -uroot -p111111
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 20
Server version: 5.7.4-m14 MySQL Community Server (GPL)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> exit

2.UNIX域套接字
UNIX域套接字并不是网络协议，所以只能在MySQL客户端和数据库实例在一台服务器上使用，用户可以在配置文件中指定套接字文件
--socket=/tmp/mysql.sock

[root@lucky performance_schema]# mysql -S/var/lib/mysql/mysql.sock -uroot -p1111
11
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 22
Server version: 5.7.4-m14 MySQL Community Server (GPL)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

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