mysqladmin是MySQL官方提供的shell命令行工具，它的參數(shù)都需要在shell命令行里面執(zhí)行，當(dāng)我們使用mysqladmin的時(shí)候，必須指定兩類參數(shù)，一類是連接參數(shù)，另外一類是命令參數(shù)，連接參數(shù)用來(lái)指定相應(yīng)的連接信息，而命令參數(shù)用來(lái)指定命令信息，例如可以用來(lái)檢查服務(wù)器的配置和當(dāng)前狀態(tài)、創(chuàng)建和刪除數(shù)據(jù)庫(kù)等。它的語(yǔ)法如下：

mysqladmin [options] command [command-options] [command [command options]] ...

除此之外，還有一些相關(guān)的參數(shù)配置(代碼可以左滑哦~)：

--bind-address=name 綁定遠(yuǎn)程訪問(wèn)主機(jī)的ip地址-i, --sleep=# 間隔多長(zhǎng)時(shí)間執(zhí)行一次。-c, --count=# 統(tǒng)計(jì)計(jì)數(shù)。與i選項(xiàng)配合使用。-f, --force 強(qiáng)制執(zhí)行，刪除數(shù)據(jù)庫(kù)是無(wú)需確認(rèn)信息，多條語(yǔ)句執(zhí)行時(shí)忽略其中某條語(yǔ)句的錯(cuò)誤。--default-character-set=name 設(shè)置默認(rèn)字符集。-?, --help 顯示幫助信息。-h, --host=name 指定連接主機(jī)。-u, --user=name 登錄用戶。-p, --password[=name] 登錄密碼，如果不寫于參數(shù)后，則會(huì)提示輸入。-P, --port=# 指定數(shù)據(jù)庫(kù)端口。--protocol=name 使用的連接協(xié)議。（tcp，socket，pipe，memory）-r, --relative 顯示前后兩次輸出的差異。必須與i選項(xiàng)配合使用。-s, --silent 靜默退出。-S, --socket=name 指定socket文件。-v, --verbose 顯示更多信息。-V, --version 顯示版本信息。-w, --wait[=#] 如果連接斷開(kāi)，等待指定的時(shí)間后重試

這么多參數(shù)，想看著比較亂，那么我們來(lái)看看它具體能夠幫我們做哪些事情吧：

#每隔兩秒查看一次服務(wù)器的狀態(tài)[root@dev01 ~]# mysqladmin -uroot -p -i 2 -c 2 statusEnter password: Uptime: 42767 Threads: 2 Questions: 533 Slow queries: 0 Opens: 346 Flush tables: Open tables: Queries per second avg: 0.012Uptime: Threads: Questions: Slow queries: Opens: Flush tables: Open tables: Queries per second avg: 0.0122.修改root密碼：

#修改root密碼mysqladmin -u root -p原密碼 password ’newpassword’3.檢查mysqlserver是否可用

#查詢服務(wù)是否正常[root@dev01 ~]# mysqladmin -uroot -p pingEnter password: mysqld is alive4.查詢服務(wù)器的版本

[root@dev01 ~]# mysqladmin -uroot -p versionEnter password: mysqladmin Ver 8.42 Distrib 5.7.19, for linux-glibc2.12 on x86_64Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Server version 5.7.19Protocol version 10Connection Localhost via UNIX socketUNIX socket /tmp/mysql.sockUptime: 12 hours 42 secThreads: 2 Questions: 538 Slow queries: 0 Opens: 346 Flush tables: 1 Open tables: 285 Queries per second avg: 0.0125.查看系統(tǒng)當(dāng)前的狀態(tài)值 （省略其中的部分結(jié)果）

[root@dev01 ~]# mysqladmin -uroot -p extended-statusEnter password: +-----------------------------------------------+----------+| Variable_name | Value |+-----------------------------------------------+----------+| Aborted_clients| || Aborted_connects| || Innodb_num_open_files | || Innodb_truncated_status_writes | | | Uptime | || Uptime_since_flush_status | |+-----------------------------------------------+----------+6.查看服務(wù)器系統(tǒng)變量值

[root@dev01 ~]# mysqladmin -uroot -p variablesEnter 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.查看當(dāng)前所有的進(jìn)程

[root@dev01 ~]# mysqladmin -uroot -p processlistEnter password: +----+------+----------------------+----------+---------+-------+----------+------------------+| Id | User | Host | db | Command | Time | State | Info |+----+------+----------------------+----------+---------+-------+----------+------------------+| | root | 192.168.56.102: | devopsdb | Sleep | | | || | root | localhost | | Query | | starting | show processlist |+----+------+----------------------+----------+---------+-------+----------+------------------+8.創(chuàng)建數(shù)據(jù)庫(kù)

[root@dev01 ~]# mysqladmin -uroot -p create db_testEnter password: [root@dev01 ~]# mysql -uroot -pEnter 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 itsaffiliates. Other names may be trademarks of their respectiveowners.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> exitBye

從上面的命令我們可以看到，我們已經(jīng)通過(guò)create命令創(chuàng)建了數(shù)據(jù)庫(kù)db_test

[root@dev01 ~]# mysqladmin -uroot -p drop db_testEnter 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] yDatabase 'db_test' dropped[root@dev01 ~]# mysql -uroot -pEnter 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 itsaffiliates. Other names may be trademarks of their respectiveowners.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)

在我們?nèi)粘２僮髦校琩rop操作應(yīng)該謹(jǐn)慎一些，可以看到，mysql也友好的給出了提醒。

[root@dev01 ~]# mysqladmin -uroot -p reloadEnter password:[root@dev01 ~]# mysqladmin -uroot -p refreshEnter password:11.啟用安全模式關(guān)閉數(shù)據(jù)庫(kù)

[root@dev01 ~]# ps -ef|grep mysqldroot : ? :: /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data/mysql --pid-file=/data/mysql/dev01.pidmysql : ? :: /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.sockroot : pts/ :: grep mysqld[root@dev01 ~]# mysqladmin -uroot -p shutdownEnter password: [root@dev01 ~]# ps -ef|grep mysqldroot : pts/ :: grep mysqld12.各種刷新命令

[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-threads13.停止和啟動(dòng)MySQL從節(jié)點(diǎn)復(fù)制過(guò)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，標(biāo)注為紅色的一般在工作中應(yīng)用的范圍及其廣泛，可以多留意下。

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