L004-oldboy-mysql-dba-lesson04

L004-oldboy-mysql-dba-lesson04

 [root@web01 mysql]# mysql -uroot -ptestpassword -S /tmp/mysql.sock

mysql> select inet_aton(‘192.168.1.200‘);

+----------------------------+

| inet_aton(‘192.168.1.200‘) |

+----------------------------+

|                 3232235976 |

+----------------------------+

1 row in set (0.00 sec)

mysql> select inet_aton(‘192.168.1.200‘);

+----------------------------+

| inet_aton(‘192.168.1.200‘) |

+----------------------------+

|                 3232235976 |

+----------------------------+

1 row in set (0.00 sec)

mysql> create database mydb;

use mydb;create table ip(ip int);

insert ip values(inet_aton(‘192.168.1.200‘));

mysql> insert ip values(inet_aton(‘192.100.2.22‘));

insert ip values(inet_aton(‘172.16.32.15‘));

insert ip values(inet_aton(‘200.100.2.22‘));

insert ip values(inet_aton(‘200.100.2.100‘));

insert ip values(inet_aton(‘200.100.3.150‘));

mysql> select * from ip;

+------------+

| ip         |

+------------+

| 2147483647 |

| 2147483647 |

| 2147483647 |

| 2147483647 |

| 2147483647 |

| 2147483647 |

+------------+

6 rows in set (0.00 sec)

mysql> create databases mydb;

use mydb;

create table ip_info(

id int unsigned not null auto_increment,

userid int unsigned not null,

username varchar(100) default ‘‘,

ip int unsigned not null,

ctime timestamp default current_timestamp on update current_timestamp,

primary key(id),

index username(username),

index userid(userid),

index ip(ip)

);

show create table ip_info;

insert into ip_info(userid,username,ip) values(11,‘aa‘,inet_aton(‘192.168.1.10‘));

select * from ip_info;

1.记录慢查询里面的有三种语句，除了这个还可能是没有使用上索引，以及DML操作语句。
2.此变量是动态变量，可以在线设置，设置要是基于session的话，可能会导致不生效，设置为global的话，如果连接不断开也会出现不马上生效的情况。

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