MySQL mysqladmin客户端的使用简介
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2022-11-23 20:15:47
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...
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:
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
13.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。
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