时间：2021-07-26 07:54:42 | 栏目：Mysql | 点击：次
mysqladmin是MySQL官方提供的shell命令行工具，它的参数都需要在shell命令行里面执行，当我们使用mysqladmin的时候，必须指定两类参数，一类是连接参数，另外一类是命令参数，连接参数用来指定相应的连接信息，而命令参数用来指定命令信息，例如可以用来检查服务器的配置和当前状态、创建和删除数据库等。它的语法如下：
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：
#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
#修改root密码 mysqladmin -u root -p原密码 password 'newpassword'
#查询服务是否正常 [root@dev01 ~]# mysqladmin -uroot -p ping Enter password: mysqld is alive
[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
[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 | | +-----------------------------------------------+----------+
[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/ | ......
[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 | +----+------+----------------------+----------+---------+-------+----------+------------------+
[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
[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。
[root@dev01 ~]# mysqladmin -uroot -p reload Enter password: [root@dev01 ~]# mysqladmin -uroot -p refresh Enter password:
[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
[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
[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。