mysqladmin [options] command [command-options] [command [command options]] ...
除此之外,还有一些相关的参数配置(代码可以左滑哦~):
--bind-address=name 绑定远程访问主机的ip地址
-i, --sleep=# 间隔多长时间执行一次。
-c, --count=# 统计计数。与i选项配合使用。
-f, --force 强制执行,删除数据库是无需确认信息,多条语句执行时忽略其中某条语句的错误。
--default-character-set=name 设置默认字符集。
-?, --help 显示帮助信息。
-h, --host=name 指定连接主机。
-u, --user=name 登录用户。
-p, --password[=name] 登录密码,如果不写于参数后,则会提示输入。
-P, --port=# 指定数据库端口。
--protocol=name 使用的连接协议。(tcp,socket,pipe,memory)
-r, --relative 显示前后两次输出的差异。必须与i选项配合使用。
-s, --silent 静默退出。
-S, --socket=name 指定socket文件。
-v, --verbose 显示更多信息。
-V, --version 显示版本信息。
-w, --wait[=#] 如果连接断开,等待指定的时间后重试
这么多参数,想看着比较乱,那么我们来看看它具体能够帮我们做哪些事情吧:
1.查看服务器的状态:
#每隔两秒查看一次服务器的状态
[root@dev01 ~]# mysqladmin -uroot -p -i 2 -c 2 status
Enter password:
Uptime: 42767 Threads: 2 Questions: 533 Slow queries: 0 Opens: 346 Flush tables: Open tables: Queries per second avg: 0.012
Uptime: Threads: Questions: Slow queries: Opens: Flush tables: Open tables: Queries per second avg: 0.012
2.修改root密码:
#修改root密码
mysqladmin -u root -p原密码 password 'newpassword'
3.检查mysqlserver是否可用
#查询服务是否正常
[root@dev01 ~]# mysqladmin -uroot -p ping
Enter password:
mysqld is alive
4.查询服务器的版本
[root@dev01 ~]# mysqladmin -uroot -p version
Enter password:
mysqladmin Ver 8.42 Distrib 5.7.19, for linux-glibc2.12 on x86_64
Copyright (c) 2000, 2017, 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.
Server version 5.7.19
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /tmp/mysql.sock
Uptime: 12 hours 42 sec
Threads: 2 Questions: 538 Slow queries: 0 Opens: 346 Flush tables: 1 Open tables: 285 Queries per second avg: 0.012
5.查看系统当前的状态值 (省略其中的部分结果)
[root@dev01 ~]# mysqladmin -uroot -p extended-status
Enter password:
+-----------------------------------------------+----------+
| Variable_name | Value |
+-----------------------------------------------+----------+
| Aborted_clients | |
| Aborted_connects | |
| Innodb_num_open_files | |
| Innodb_truncated_status_writes | |
| Uptime | |
| Uptime_since_flush_status | |
+-----------------------------------------------+----------+
6.查看服务器系统变量值
[root@dev01 ~]# mysqladmin -uroot -p variables
Enter password:
......
| key_cache_block_size | |
| key_cache_division_limit | |
| large_files_support | ON |
| large_page_size | |
| large_pages | OFF |
| lc_messages | en_US |
| lc_messages_dir | /usr/local/mysql/share/ |
......
7.查看当前所有的进程
[root@dev01 ~]# mysqladmin -uroot -p processlist
Enter password:
+----+------+----------------------+----------+---------+-------+----------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+----------------------+----------+---------+-------+----------+------------------+
| | root | 192.168.56.102: | devopsdb | Sleep | | | |
| | root | localhost | | Query | | starting | show processlist |
+----+------+----------------------+----------+---------+-------+----------+------------------+
8.创建数据库
[root@dev01 ~]# mysqladmin -uroot -p create db_test
Enter password:
[root@dev01 ~]# mysql -uroot -p
Enter password:
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
Server version: 5.7.19 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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 databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| TkGrowDB_dbo |
| TkGrowLog_dbo |
| cydevopsdb |
| db_test |
| yeyz |
+--------------------+
rows in set (0.00 sec)
mysql> exit
Bye
从上面的命令我们可以看到,我们已经通过create命令创建了数据库db_test
9.删除特定的数据库:
[root@dev01 ~]# mysqladmin -uroot -p drop db_test
Enter password:
Dropping the database is potentially a very bad thing to do.
Any data stored in the database will be destroyed.
Do you really want to drop the 'db_test' database [y/N] y
Database "db_test" dropped
[root@dev01 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7.19 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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 databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| TkGrowDB_dbo |
| TkGrowLog_dbo |
| cydevopsdb |
| yeyz |
+--------------------+
rows in set (0.00 sec)
在我们日常操作中,drop操作应该谨慎一些,可以看到,mysql也友好的给出了提醒。
10.重载权限表和刷新缓存(无明显输出)
[root@dev01 ~]# mysqladmin -uroot -p reload
Enter password:
[root@dev01 ~]# mysqladmin -uroot -p refresh
Enter password:
11.启用安全模式关闭数据库
[root@dev01 ~]# ps -ef|grep mysqld
root : ? :: /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data/mysql --pid-file=/data/mysql/dev01.pid
mysql : ? :: /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/data/mysql/mysqld.log --pid-file=/data/mysql/dev01.pid --socket=/tmp/mysql.sock
root : pts/ :: grep mysqld
[root@dev01 ~]# mysqladmin -uroot -p shutdown
Enter password:
[root@dev01 ~]# ps -ef|grep mysqld
root : pts/ :: grep mysqld
12.各种刷新命令
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-hosts
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-logs
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-privileges
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-status
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-tables
[root@dev01 ~]# mysqladmin -u root -ptmppassword flush-threads
14.停止和启动MySQL从节点复制过程
[root@dev01 ~]# mysqladmin -u root -p stop-slave
[root@dev01 ~]# mysqladmin -u root -p start-slave
以上就是mysqladmin最常用的一些功能,标注为红色的一般在工作中应用的范围及其广泛,可以多留意下。