MySql 学习笔记

MySql 学习笔记

安装

### 服务端
sudo apt-get install mysql-server

### 客户端
sudo apt-get install mysql-client-core-5.6

登陆

$mysql -h 192.168.2.79 -u root -p

提示:
    $ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.2.79' (111)

Google说:

    >MySQL by default listens only on the localhost (127.0.0.1) interface.

so:

    在配置文件中解除如下代码的注释：

        # Instead of skip-networking the default is now to listen only on
        # localhost which is more compatible and is not less secure.
        # bind-address          = 127.0.0.1

    >Uncomment the bind-address line, and bind to 0.0.0.0 to bind to all addresses on the system.

then:
    sudo service mysql restart

and again:
    mysql -h 192.168.2.79 -u root -p

prompt:
    >ERROR 1130 (HY000): Host '192.168.2.44' is not allowed to connect to this MySQL server

on server, login to mysql server:

    $mysql -u root -p

    and:
        mysql>GRANT ALL privileges on *.* to 'root'@'%';
        mysql>flush privileges;

on client mathine:

    $mysql -h 192.168.2.79 -u root -p
    >Enter password:******
    >ERROR 1045 (28000): Access denied for user 'root'@'192.168.2.44' (using password: YES)

but empty password can login:

    $mysql -h 192.168.2.79 -u root

所以在服务器端登陆mysql， 使用如下指令：

    mysql>CREATE USER 'peng'@'192.168.2.44' IDENTIFIED BY '123123';
    mysql>grant all privileges on *.* to 'peng'@'192.168.2.44';
    mysql>flush privileges;

然后就可以登陆了.

疑问：

    使用如下指令不能解决该问题，不知道为什么

    mysql>grant all privileges on *.* to 'root'@'%' with grant option;

创建数据库

mysql> create database backup_test character set gbk;
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| backup_test        |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

建表

mysql> use backup_test
Database changed
mysql> create table employee
    -> (
    -> id int unsigned not null auto_increment primary key,
    -> name char(8) not null,
    -> sex char(4) not null,
    -> age tinyint unsigned not null,
    -> tel char(13) null default "-"
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql> show tables;
+-----------------------+
| Tables_in_backup_test |
+-----------------------+
| employee              |
+-----------------------+
1 row in set (0.00 sec)

mysql>INSERT INTO `employee` VALUES (1,'张鹏','男',38,'15613539902');
mysql> select * from employee;
+----+--------+-----+-----+-------------+
| id | name   | sex | age | tel         |
+----+--------+-----+-----+-------------+
|  1 | 张鹏   | 男  |  38 | 15613539902 |
+----+--------+-----+-----+-------------+
1 row in set (0.01 sec)

备份

增量备份

1. 首先完整备份

        $ mysqldump -h 192.168.2.79 -u peng -p --single-transaction --master-data=2 backup_test > test.sql

        $ Binlogging on server not active

    修改 my.cnf (/etc/mysql/my.cnf),  在 [mysqld] 小节最后加入一行：

        log-bin=mysql-bin

    然后重启mysql:
        $sudo service mysql restart

2. 增加记录

    mysql>INSERT INTO `employee`(name, sex, age) VALUES ('刘艳丽','女',25);
    mysql>INSERT INTO `employee`(name, sex, age) VALUES ('张磊','男',32); 
    mysql>flush logs;