标签:http center from 丢失 share 行数据 date rest variables
需求描述:
北京移电通信公司的用户信息数据库为client,用户资费数据表为user_info,表结构如下所示。请为该公司指定合理的备份策略,依据所指定的策略备份数据,模拟数据丢失进行数据恢复。
创建数据及表,录入数据:
[root@localhost ~]# mysql -uroot -p123456
mysql> create database client;
Query OK, 1 row affected (0.00 sec)
mysql> use client;
Database changed
mysql> show variables like ‘character_set_%‘;//查看字符集是否支持中文
+--------------------------+----------------------------------+
| Variable_name | Value |
+--------------------------+----------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/local/mysql/share/charsets/ |
+--------------------------+----------------------------------+
8 rows in set (0.00 sec)
///////【1】create database client DEFAULT CHARACTER SET utf-8; //在创建库的时候声明库的字符集
【2】vim /etc/my.conf
在中间添加
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci ////////这个定义是所有的库
[client]
default-character-set=utf8 ///////定义某个用户////////////////////// 然后重启mariadb
mysql> create table user_info(身份证 int(20),姓名 char(20),性别 char(2),用户ID号 int(110),资费 int(10));
Query OK, 0 rows affected (0.01 sec)
desc user_info //查看描述信息
mysql> insert into user_info values(‘000000001‘,‘孙空武‘,‘男‘,‘011‘,‘100‘);
Query OK, 1 row affected (0.01 sec)
mysql> insert into user_info values(‘000000002‘,‘蓝凌‘,‘女‘,‘012‘,‘98‘);
Query OK, 1 row affected (0.01 sec)
mysql> insert into user_info values(‘000000003‘,‘姜纹‘,‘女‘,‘013‘,‘12‘);
Query OK, 1 row affected (0.00 sec)
mysql> insert into user_info values(‘000000004‘,‘关园‘,‘男‘,‘014‘,‘38‘);
Query OK, 1 row affected (0.01 sec)
mysql> insert into user_info values(‘000000004‘,‘罗中昆‘,‘男‘,‘015‘,‘39‘);
Query OK, 1 row affected (0.01 sec)
mysql> select * from user_info;
+-----------+-----------+--------+-------------+--------+
| 身份证 | 姓名 | 性别 | 用户ID号 | 资费 |
+-----------+-----------+--------+-------------+--------+
| 1 | 孙空武 | 男 | 11 | 100 |
| 2 | 蓝凌 | 女 | 12 | 98 |
| 3 | 姜纹 | 女 | 13 | 12 |
| 4 | 关园 | 男 | 14 | 38 |
| 4 | 罗中昆 | 男 | 15 | 39 |
+-----------+-----------+--------+-------------+--------+
5 rows in set (0.00 sec)
完整备份client.user_info表:
[root@localhost ~]# mysqldump -uroot -p123456 client user_info > backup/client.user_info-$(date +%Y%m%d).sql
grep -Ev "^$|^/|^-" backup/client.user...sql //查看
模拟数据丢失恢复数据:
[root@localhost ~]# mysql -uroot -p123456 -e ‘drop table client.user_info;‘
[root@localhost ~]# mysql -uroot -p123456 -e ‘use client; show tables;‘
[root@localhost ~]# mysql -uroot -p123456 client < backup/client.user_info-20181214.sql
[root@localhost ~]# mysql -uroot -p123456 -e ‘select * from client.user_info;‘
+-----------+-----------+--------+-------------+--------+
| 身份证 | 姓名 | 性别 | 用户ID号 | 资费 |
+-----------+-----------+--------+-------------+--------+
| 1 | 孙空武 | 男 | 11 | 100 |
| 2 | 蓝凌 | 女 | 12 | 98 |
| 3 | 姜纹 | 女 | 13 | 12 |
| 4 | 关园 | 男 | 14 | 38 |
| 4 | 罗中昆 | 男 | 15 | 39 |
+-----------+-----------+--------+-------------+--------+
定期备份数据:
[root@localhost ~]# which mysqldump
/usr/local/mysql/bin/mysqldump
[root@localhost ~]# vim /opt/bak_client.sh
#!/bin/bash
# 备份client.user_info表 脚本
mysqldump -uroot -p123456 client user_info >backup/client.user_info-$(date +%Y%m%d).sql
[root@localhost ~]# chmod +x /opt/bak_client.sh
[root@localhost ~]# crontab -e
0 0 * * * /opt/bak_client.sh//每天0:00备份
重启计划任务 systemtcl restart crontab
标签:http center from 丢失 share 行数据 date rest variables
原文地址:https://www.cnblogs.com/elin989898/p/11961535.html