Introduction to using the MySQL mysqladmin client

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

--bind-address=name Bind the IP address of the remote access host -i, --sleep=# How long does it take to execute it?
-c, --count=# Statistics count. Use with the i option.
-f, --force Force execution. No confirmation is required when deleting a database. When multiple statements are executed, errors in one of the statements will be ignored.
--default-character-set=name Set the default character set.
-?, --help Display help information.
-h, --host=name specifies the connection host.
-u, --user=name Login user.
-p, --password[=name] Login password. If it is not written after the parameter, you will be prompted to enter it.
-P, --port=# Specify the database port.
--protocol=name The connection protocol to use. (tcp, socket, pipe, memory)
-r, --relative Show the difference between the previous and the next output. Must be used with the i option.
-s, --silent Exit silently.
-S, --socket=name specifies the socket file.
-v, --verbose Display more information.
-V, --version Display version information.
-w, --wait[=#] If the connection is disconnected, wait for the specified time and try again

#Check the server status every two seconds [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

#Change the root password mysqladmin -u root -p original password password 'newpassword'

#Query whether the service is normal [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 seconds

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

[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)

[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