Linux基础（day55）

运维小白

发布于 2018-02-06 16:03:54

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发布于 2018-02-06 16:03:54

文章被收录于专栏：运维小白

13.4 mysql用户管理

mysql用户管理目录概要

grant all on . to 'user1' identified by 'passwd';
grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
grant all on db1.* to 'user3'@'%' identified by 'passwd';
show grants;
show grants for user2@192.168.133.1;

mysql用户管理

场景，为了安全，新建的站点，创建新的用户，或者给予使用已有账户，给予权限
grant all on . to 'user1' identified by 'passwd';
- grant 表示授权
- all 表示所有权限，查看，创建，删除等等
- on . to 'user1' identified by 'passwd';
若是登录到mysql中后，输错了字符，并按了回车键，直接输入分号 ; 就会推出，回到mysql的命令行
退出mysql除了使用 quit 命令，还可以使用 exit 命令，还可以ctrl+d快捷键退出

登录到mysql

[root@hf-01 ~]# mysql -uroot -p'hanfeng'
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 1
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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>

创建普通用户user1，命令

命令grant all on . to 'user1'@'127.0.0.1' identified by '123456a';——>在输入命令的时候，千万要注意符号，一旦漏失了符号 ' '，那么后面就无法登录到user1的mysql
- 'user1'@'127.0.0.1' 指定用户@指定来源IP （指定用户可以写 % 就是通配，表示所有的IP）如果指定了来源IP，那么只能通过来源IP登录
- 符号*.* 表示所有库，所有表
  - 第一个 * 表示库名，可以写成mysql.* 那就表示对mysql所有的表
- identified by 'passwd' 指定user1的mysql密码
grant语句，是不会记录到命令历史中的因为不安全

mysql>  grant all on *.* to 'user1'@'127.0.0.1' identified by '123456a';
Query OK, 0 rows affected (0.02 sec)

mysql>

退出数据库，并尝试user1是否可以登录

[root@hf-01 ~]# mysql -uuser1 -p'123456a'
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'user1'@'localhost' (using password: YES)
[root@hf-01 ~]#

会看到登录失败，因为它默认的是sock，需要指定 -h 指定IP，会看到成功登录到user1的数据库

[root@hf-01 ~]# mysql -uuser1 -p123456a -h127.0.0.1
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 13
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> quit
Bye

授权localhost，授权本地，用sock去连接
重新登录root，并输入localhost，创建成功后，并退出

grant all on . to 'user1'@'localhost' identified by '123456a';

[root@hf-01 ~]#  mysql -uroot -p'hanfeng'
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 14
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> grant all on *.* to 'user1'@'localhost' identified by '123456a';
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye
[root@hf-01 ~]#

这时不加-h 也可以登录到user1了，因为现在授权就是针对localhost，localhost就是针对的sock

[root@hf-01 ~]# mysql -uuser1 -p123456a
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 15
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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
Bye

退出数据库除了用 quit 命令，还可以用 exit 命令，还可以ctrl+d快捷键退出

针对具体的权限去授权

grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
- 针对SELECT,UPDATE,INSERT，针对 db1这个库所有的表给用户user2来源IP，并设定密码
grant all on db1.* to 'user3'@'%' identified by 'passwd';
- 针对所有的IP去授权
show grants; 查看所有的授权
- 在登录到某一用户下，show grants;会查看到当前用户的权限的
- 登录user1用户的mysql，去查看授权

[root@hf-01 ~]# mysql -uuser1 -p123456a
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 16
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> show grants;
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for user1@localhost                                                                                            |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'user1'@'localhost' IDENTIFIED BY PASSWORD '*B012E8731FF1DF44F3D8B26837708985278C3CED' |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>

show grants for user1@127.0.0.1; 指定用户去查看授权
- 登录root用户的mysql，然后查看user1用户的mysql的授权

[root@hf-01 ~]#  mysql -uroot -p'hanfeng'
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 17
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> show grants for user1@'127.0.0.1';
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for user1@127.0.0.1                                                                                            |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'user1'@'127.0.0.1' IDENTIFIED BY PASSWORD '*B012E8731FF1DF44F3D8B26837708985278C3CED' |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>

show grants;需求

show grants；看的是root

创建一个用户user2，并做一个授权

grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';

mysql> grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
Query OK, 0 rows affected (0.01 sec)

mysql>

查看user2的授权

show grants for user2@'192.168.133.1';

mysql> show grants for user2@'192.168.133.1';
+------------------------------------------------------------------------------------------------------------------+
| Grants for user2@192.168.133.1                                                                                   |
+------------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'user2'@'192.168.133.1' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' |
| GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.1'                                               |
+------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql>

有一种情况会用到它，比如说，给192.168.133.1做了授权了，但发现一个IP不够，还有一个192.168.133.2，也就是说user2用户不仅需要在192.168.133.1上登录，还需要在192.168.133.2上登录，这时候就需要把授权的命令全部在执行一遍
这时候就可以直接把GRANT USAGE ON . TO 'user2'@'192.168.133.1' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' 复制一遍，将其中192.168.133.1改为192.168.133.2 并在语句结尾加上分号 ;

mysql> GRANT USAGE ON *.* TO 'user2'@'192.168.133.2' IDENTIFIED BY PASSWOORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0';
Query OK, 0 rows affected (0.00 sec)

mysql>

然后再将第二行复制GRANT SELECT, INSERT, UPDATE ON db1.* TO 'user2'@'192.168.133.1' 把IP改为192.168.133.2，并加上分号 ;

mysql> GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.2';
Query OK, 0 rows affected (0.01 sec)

mysql>

这时候在来查看show grants查看192.168.133.2

mysql> show grants for user2@'192.168.133.2';
+------------------------------------------------------------------------------------------------------------------+
| Grants for user2@192.168.133.2                                                                                   |
+------------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'user2'@'192.168.133.2' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' |
| GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.2'                                               |
+------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql>

show grants;会看到同样的密码，同样的用户，唯一改变的就是IP
在知道mysql的用户名，但不知道密码，也可以这样去授权

13.5 常用sql语句

常用sql语句目录概要

select count(*) from mysql.user;
select * from mysql.db;
select db from mysql.db;
select db,user from mysql.db;
select * from mysql.db where host like '192.168.%';
insert into db1.t1 values (1, 'abc');
update db1.t1 set name='aaa' where id=1;
truncate table db1.t1;
drop table db1.t1;
drop database db1;

常用sql语句

增删改查，就是mysql和其他关系型数据库常用的select语句操作命令

查询语句

首先登录root下的mysql

[root@hf-01 ~]#  mysql -uroot -p'hanfeng'
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 18
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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>

使用db1库

mysql> use db1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql>

查看当前库的所有表show tables;

mysql> show tables;
+---------------+
| Tables_in_db1 |
+---------------+
| t1            |
+---------------+
1 row in set (0.00 sec)

mysql>

查看表的行数 select count(*) from mysql.user;

库和表中间有个分割符，就是用点 . 分割

mysql> select count(*) from mysql.user;
+----------+
| count(*) |
+----------+
|       12 |
+----------+
1 row in set (0.01 sec)

mysql>

就是说user表有12行内容

查看所有的内容 select * from mysql.db;（这样看起来会很乱） ——>可以在后面加上\G，如select * from mysql.db\G;

这里的 * 表示查看所有内容

mysql> select * from mysql.db/G;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '/G' at line 1
mysql> select * from mysql.db\G;
*************************** 1. row ***************************
                 Host: %
                   Db: test
                 User: 
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: Y
          Create_priv: Y
            Drop_priv: Y
           Grant_priv: N
      References_priv: Y
           Index_priv: Y
           Alter_priv: Y
Create_tmp_table_priv: Y
     Lock_tables_priv: Y
     Create_view_priv: Y
       Show_view_priv: Y
  Create_routine_priv: Y
   Alter_routine_priv: N
         Execute_priv: N
           Event_priv: Y
         Trigger_priv: Y
*************************** 2. row ***************************
 等等等，只截取了一部分

查看db库的所有内容 select db from mysql.db; 第一个db是字段

mysql> select db from mysql.db;
+---------+
| db      |
+---------+
| test    |
| test\_% |
| db1     |
| db1     |
+---------+
4 rows in set (0.01 sec)

mysql>

查db字段和user字段 select db,user from mysql.db;

mysql> select db,user from mysql.db;
+---------+-------+
| db      | user  |
+---------+-------+
| test    |       |
| test\_% |       |
| db1     | user2 |
| db1     | user2 |
+---------+-------+
4 rows in set (0.00 sec)

mysql>

模糊查询 select * from mysql.db where host like '192.168.%';

like 就是模糊匹配

mysql> select * from mysql.db where host like '192.168.%'\G;
*************************** 1. row ***************************
                 Host: 192.168.133.1
                   Db: db1
                 User: user2
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: N
          Create_priv: N
            Drop_priv: N
           Grant_priv: N
      References_priv: N
           Index_priv: N
           Alter_priv: N
Create_tmp_table_priv: N
     Lock_tables_priv: N
     Create_view_priv: N
       Show_view_priv: N
  Create_routine_priv: N
   Alter_routine_priv: N
         Execute_priv: N
           Event_priv: N
         Trigger_priv: N
*************************** 2. row ***************************
                 Host: 192.168.133.2
                   Db: db1
                 User: user2
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: N
          Create_priv: N
            Drop_priv: N
           Grant_priv: N
      References_priv: N
           Index_priv: N
           Alter_priv: N
Create_tmp_table_priv: N
     Lock_tables_priv: N
     Create_view_priv: N
       Show_view_priv: N
  Create_routine_priv: N
   Alter_routine_priv: N
         Execute_priv: N
           Event_priv: N
         Trigger_priv: N
2 rows in set (0.00 sec)

ERROR: 
No query specified

mysql>

插入语句

查看创建的表

mysql> desc db1.t1;
+-------+----------+------+-----+---------+-------+
| Field | Type     | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| id    | int(4)   | YES  |     | NULL    |       |
| name  | char(40) | YES  |     | NULL    |       |
+-------+----------+------+-----+---------+-------+
2 rows in set (0.01 sec)

mysql>

查看db1.t1表的内容，会发现为空

mysql> select * from db1.t1;
Empty set (0.00 sec)

mysql>

插入数据到 insert into db1.t1 values (1, 'abc');

插入1, 'abc'到db1.t1表

mysql> insert into db1.t1 values (1, 'abc');
Query OK, 1 row affected (0.02 sec)

mysql>

再来查询db1.t1

mysql> select * from db1.t1;
+------+------+
| id   | name |
+------+------+
|    1 | abc  |
+------+------+
1 row in set (0.00 sec)

mysql>

这样就成功了插入了一条数据，在插入的时候 name 这个字段应该是是一个字符串，字符串需要加上一个单引号 ' ' ，数字可以不加单引号

mysql> insert into db1.t1 values (1, 234);
Query OK, 1 row affected (0.01 sec)

mysql> select * from db1.t1;
+------+------+
| id   | name |
+------+------+
|    1 | abc  |
|    1 | 234  |
+------+------+
2 rows in set (0.00 sec)

mysql>

5.这里没有做限制，这里id和name都可以是相同的，同一个字段里有相同的数字，相同的值 6. 也可以做一些限制，在插入相同的id的时候，就会冲突

update操作

更改db1.t1表的字符串为name 的数据和字符串为id 的数据
update db1.t1 set name='aaa' where id=1;

mysql> update db1.t1 set name='aaa' where id=1;
Query OK, 2 rows affected (0.01 sec)
Rows matched: 2  Changed: 2  Warnings: 0

mysql> select * from db1.t1;
+------+------+
| id   | name |
+------+------+
|    1 | aaa  |
|    1 | aaa  |
+------+------+
2 rows in set (0.00 sec)

mysql>

delete操作

删除db1.t1表的数据和字符串为id 的数据
delete from db1.t1 where id=1;

mysql> delete from db1.t1 where id=1;
Query OK, 2 rows affected (0.01 sec)

mysql> select * from db1.t1;
Empty set (0.00 sec)

mysql>

truncate清空一个表

清空表数据 truncate table db1.t1;
- 即使表的数据清空了，但表的字段依旧存在的

mysql> insert into db1.t1 values (1, 234);
Query OK, 1 row affected (0.00 sec)

mysql> select * from db1.t1;
+------+------+
| id   | name |
+------+------+
|    1 | 234  |
+------+------+
1 row in set (0.00 sec)

mysql> truncate table db1.t1;
Query OK, 0 rows affected (0.02 sec)

mysql> select * from db1.t1;
Empty set (0.00 sec)

mysql> desc db1.t1;
+-------+----------+------+-----+---------+-------+
| Field | Type     | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| id    | int(4)   | YES  |     | NULL    |       |
| name  | char(40) | YES  |     | NULL    |       |
+-------+----------+------+-----+---------+-------+
2 rows in set (0.00 sec)

mysql>

truncate 只是清空的内容，而drop 会清空表的数据并清除表的框架
drop 会把表的框架也丢掉 drop table db1.t1;

mysql> drop table db1.t1;
Query OK, 0 rows affected (0.01 sec)

mysql> select * from db1.t1;    //因为表的架构已经不存在了
ERROR 1146 (42S02): Table 'db1.t1' doesn't exist
mysql>

丢掉表 drop database db1;

总结

在使用mysql的时候，少用 * 这样的操作，因为若是一个表里面的内容很多，select count(*)这样操作就会很耗时，浪费资源
数据库中常用引擎是myisam和innodb，默认mysql库里面都是使用的myisam引擎
- 特点：myisam引擎，能自动去统计有多少行
  - 在select count(*)查看表的时候会很快
  - use mysql;
  - show create table user\G;
- 特点：innodb引擎，不会自动统计行数，每次去查询，每次去统计行数，就会很耗时
  - use db1
  - show create table t1;
- 所以select count(*)这种操作尽量减少，会耗费太多资源

13.6 mysql数据库备份恢复

mysql数据库备份恢复目录概要

备份库 mysqldump -uroot -p123456 mysql > /tmp/mysql.sql
恢复库 mysql -uroot -p123456 mysql < /tmp/mysql.sql
- 恢复是，必须保证目录一致
备份表 mysqldump -uroot -p123456 mysql user > /tmp/user.sql
恢复表 mysql -uroot -p123456 mysql < /tmp/user.sql
备份所有库 mysqldump -uroot -p -A >/tmp/123.sql
只备份表结构 mysqldump -uroot -p123456 -d mysql > /tmp/mysql.sql

mysql数据库备份恢复

备份库

在执行mysqldump -uroot -p123456 mysql的时候会看到很多信息，屏幕上显示的这些就是备份的数据
备份mysql库文件

mysqlbak.sql文件就是mysql的备份库文件

[root@hf-01 ~]#  mysqldump -uroot -p'hanfeng' mysql > /tmp/mysqlbak.sql
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]#

我们可以通过mysqlbak.sql来恢复数据库，还可以恢复到另外一个数据库里面去
创建一个新的库mysql2

[root@hf-01 ~]#  mysql -uroot -p'hanfeng' -e "create database mysql2"
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]#

恢复库

mysql -uroot -phanfeng mysql < /tmp/mysql.sql

[root@hf-01 ~]#  mysql -uroot -p'hanfeng' mysql < /tmp/mysqlbak.sql
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]#

进入到数据库里面，在后面加一个mysql2 就会进入到mysql2数据库里面

mysql -uroot -p'hanfeng' mysql2

[root@hf-01 ~]#  mysql -uroot -p'hanfeng' mysql2
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 6
Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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>

查看数据库

mysql> select database();
+------------+
| database() |
+------------+
| mysql2     |
+------------+
1 row in set (0.00 sec)

mysql>

备份表

针对库里面的某一个表去做备份，只需要在库后面加上表名字即可备份
- 先库在表，中间是空格
- 备份表 mysqldump -uroot -p123456 mysql user > /tmp/user.sql
能看到备份的时候，库存在的话，先把库drop掉，然后创建库，表存在的话，先把表drop掉，然后创建表，然后在一步一步的插入每一行数据

[root@hf-01 ~]# mysqldump -uroot -phanfeng mysql user > /tmp/user.sql
Warning: Using a password on the command line interface can be insecure.

[root@hf-01 ~]# less /tmp/user.sql  查看备份表

恢复表的时候，只需要写库的名字，不需要去写表的名字
- 恢复表 mysql -uroot -p123456 mysql < /tmp/user.sql
恢复mysql2库里面的表

[root@hf-01 ~]# mysql -uroot -phanfeng mysql2 < /tmp/user.sql
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]#

备份所有的库

备份所有库 mysqldump -uroot -phanfeng -A >/tmp/123.sql
- -A 表示all所有的意思

[root@hf-01 ~]# mysqldump -uroot -phanfeng -A > /tmp/mysql_all.sql
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]# 

[root@hf-01 ~]# less /tmp/mysql_all.sql

只备份表结构 mysqldump -uroot -phanfeng -d mysql > /tmp/mysql.sql
- 不需要表的数据，只需要表的语句
备份mysql2的表结构

[root@hf-01 ~]# mysqldump -uroot -phanfeng -d mysql2 > /tmp/mysql.sql
Warning: Using a password on the command line interface can be insecure.
[root@hf-01 ~]#

[root@hf-01 ~]# less /tmp/mysql.sql

示例

两个机器的库备份，一个库备份到另一台机器上
解决：
- 首先两台机器能够通信
- 然后mysqldump -h 远程mysql-ip -uuser-ppassword dbname > /本地backup.sql
- 这样既可备份

扩展

使用xtrabackup备份innodb引擎的数据库 innobackupex 备份 Xtrabackup 增量备份

http://zhangguangzhi.top/2017/08/23/innobackex%E5%B7%A5%E5%85%B7%E5%A4%87%E4%BB%BDmysql%E6%95%B0%E6%8D%AE/#%E4%B8%89%E3%80%81%E5%BC%80%E5%A7%8B%E6%81%A2%E5%A4%8Dmysql 相关视频链接：http://pan.baidu.com/s/1miFpS9M 密码：86dx 链接：http://pan.baidu.com/s/1o7GXBBW 密码：ue2f

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Linux基础（day55）

Linux基础（day55）

13.4 mysql用户管理

mysql用户管理目录概要

mysql用户管理

针对具体的权限去授权

show grants;需求

13.5 常用sql语句

常用sql语句目录概要

常用sql语句

查询语句

插入语句

update操作

delete操作

truncate清空一个表

总结

13.6 mysql数据库备份恢复

mysql数据库备份恢复目录概要

mysql数据库备份恢复

备份库

备份表

备份所有的库

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