If you have a fresh installation of MySQL server, then it doesn’t require a password to connect as the root user. To set the MySQL password for the root user, use the following command.
- # mysqladmin -u root password YOURNEWPASSWORD
How to Change MySQL Root passwordIf you would like to change or update the
MySQL root password, then you need to use the following command. For example, say your old password is
123456 and you want to change it to a new password, say xyz123. Use the following:
mysqladmin -u root -p123456 password
'xyz123'.
How to determine if MySQL Server is runningTo determine whether the
MySQL server is up and running, use the following command.
- # mysqladmin -u root -p ping
Enter password:
How to determine which MySQL version I am running
The following command shows the MySQL version along with the current running status.
- # mysqladmin -u root -p version
Enter password:
mysqladmin Ver 8.42 Distrib 5.5.28, for Linux on i686
Copyright (c) 2000, 2012, 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 |
5.5.28 |
| Protocol version |
10 |
| Connection |
Localhost via UNIX socket |
| UNIX socket |
/var/lib/mysql/mysql.sock |
| Uptime: |
7 days 14 min 45 sec |
Threads: 2 Questions: 36002 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8 Queries per second avg: 0.059
How to determine current Status of MySQL server
To determine the current status of the MySQL server, use the following command. The mysqladmin command shows the status of uptime with the running threads and queries.
- # mysqladmin -u root -ptmppassword status
Enter password:
Uptime: 606704 Threads: 2 Questions: 36003 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8 Queries per second avg: 0.059
How to determine the status of all MySQL Server Variables and values
To check all the running status of
MySQL server variables and values, type the following command. The output would be similar to below.
- # mysqladmin -u root -p extended-status
Enter password:
| Variable_name |
Value |
| Aborted_clients |
3 |
| Aborted_connects |
3 |
| Binlog_cache_disk_use |
0 |
| Binlog_cache_use |
0 |
| Binlog_stmt_cache_disk_use |
0 |
| Binlog_stmt_cache_use |
0 |
| Bytes_received |
6400357 |
| Bytes_sent |
2610105 |
| Com_admin_commands |
3 |
| Com_assign_to_keycache |
0 |
| Com_alter_db |
0 |
| Com_alter_db_upgrade |
0 |
| Com_alter_event |
0 |
| Com_alter_function |
0 |
| Com_alter_procedure |
0 |
| Com_alter_server |
0 |
| Com_alter_table |
0 |
| Com_alter_tablespace |
0 |
How to see all MySQL server Variables and Values
To see all the running variables and values of MySQL server, use the following command.
- # mysqladmin -u root -p variables
Enter password:
| Variable_name |
Value |
| auto_increment_increment |
1 |
| auto_increment_offset |
1 |
| autocommit |
ON |
| automatic_sp_privileges |
ON |
| back_log |
50 |
| basedir |
/usr |
| big_tables |
OFF |
| binlog_cache_size |
32768 |
| binlog_direct_non_transactional_updates |
OFF |
| binlog_format |
STATEMENT |
| binlog_stmt_cache_size |
32768 |
| bulk_insert_buffer_size |
8388608 |
| character_set_client |
latin1 |
| character_set_connection |
latin1 |
| character_set_database |
latin1 |
| character_set_filesystem |
binary |
| character_set_results |
latin1 |
| character_set_server |
latin1 |
| character_set_system |
utf8 |
| character_sets_dir /usr/share/mysql/charsets/ |
|
| collation_connection |
latin1_swedish_ci |
How to check all the running Process of MySQL server
The following command will display all the running process of MySQL database queries.
- # mysqladmin -u root -p processlist
Enter password:
| Id Info |
User |
Host |
db |
Command |
Time |
State |
| 18001 |
rsyslog |
localhost:38307 |
rsyslog |
Sleep |
5590 |
|
| 18020 |
root |
localhost |
|
Query |
0 |
|
| Show process List |
|
|
|
|
|
|
How to create a Database in MySQL server
To create a new database in MySQL server, use the command as shown below.
- # mysqladmin -u root -p create databasename
Enter password:
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 18027
Server version: 5.5.28 MySQL Community Server (GPL) by Remi
Copyright (c) 2000, 2012, 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.
| Database |
| information_schema |
| databasename |
| mysql |
| test |
8 rows in set (0.01 sec)
mysql>
How to drop a database in MySQL server
To drop a database in MySQL server, use the following command. You will be asked to confirm by pressing ‘y‘.
# mysqladmin -u root -p drop databasename
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 'databasename' database [y/N] y
Database "databasename" dropped.
How to reload/refresh MySQL Privileges
The reload command tells the server to reload the grant tables. The refresh command flushes all tables and reopens the log files.
# mysqladmin -u root -p reload;
# mysqladmin -u root -p refresh
How to shutdown MySQL server Safely
To shutdown MySQL server safely, type the following command.
mysqladmin -u root -p shutdown
Enter password:
You can also use the following commands to start/stop MySQL server.
- # /etc/init.d/mysqld stop
- # /etc/init.d/mysqld start
Some useful MySQL Flush commands
The following are some useful flush commands with their description.
- flush-hosts: Flush all host information from host cache.
- flush-tables: Flush all tables.
- flush-threads: Flush all threads cache.
- flush-logs: Flush all information logs.
- flush-privileges: Reload the grant tables (same as reload).
- flush-status: Clear status variables.
- # mysqladmin -u root -p flush-hosts
- # mysqladmin -u root -p flush-tables
- # mysqladmin -u root -p flush-threads
- # mysqladmin -u root -p flush-logs
- # mysqladmin -u root -p flush-privileges
- # mysqladmin -u root -p flush-status
How to kill Sleeping MySQL Client ProcessUse the following command to identify a sleeping MySQL client process.
- # mysqladmin -u root -p processlist
Enter password:
| Id |
User |
Host |
db |
Command |
Time |
States |
Info |
| 5 |
root |
localhost |
|
sleep |
14 |
|
show processlist |
| 8 |
root |
localhost |
|
Query |
0 |
|
|
Now, run the following command with kill and process ID as shown below.
- # mysqladmin -u root -p kill 5
Enter password:
| Id |
User |
Host |
db |
Command |
Time |
States |
Info |
| 12 |
root |
localhost |
|
Query |
0 |
|
show processlist |
If you like to kill multiple processes then pass the process IDs separated by commas as shown below.
- # mysqladmin -u root -p kill 5,10
How to run multiple mysqladmin commands together
If you would like to execute multiple
‘mysqladmin‘ commands together, then the command would be like this.
- # mysqladmin -u root -p processlist status version
Enter password:
| Id |
User |
Host |
db |
Command |
Time |
States |
Info |
| 8 |
root |
localhost |
|
Query |
0 |
|
show processlist |
Uptime: 3801 Threads: 1 Questions: 15 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8 Queries per second avg: 0.003
mysqladmin Ver 8.42 Distrib 5.5.28, for Linux on i686
Copyright (c) 2000, 2012, 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 |
5.5.28 |
| Protocol version |
10 |
| Connection |
Localhost via UNIX socket |
| UNIX socket |
/var/lib/mysql/mysql.sock |
| Uptime: |
1 hour 3 min 21 sec |
Threads: 1 Questions: 15 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8 Queries per second avg: 0.003
16. How to connect to remote MySQL server
To connect to a remote MySQL server, use the -h (host) with IP Address of remote machine.
- # mysqladmin -h 172.16.25.126 -u root -p
How to execute command on remote MySQL serverLet’s say you would like to see the
status of a remote
MySQL server, then the command would be:
- # mysqladmin -h 172.16.25.126 -u root -p status
How to start/stop MySQL replication on a slave serverTo start/stop
MySQL replication on the same server, use the following commands.
- # mysqladmin -u root -p start-slave
- # mysqladmin -u root -p stop-slave
How to store MySQL server Debug Information to logs
It tells the server to write debug information about locks in use, used memory and query usage to the
MySQL log file including information about the event scheduler.
- # mysqladmin -u root -p debug
Enter password:
How to view mysqladmin options and usage
To determine more options and usage of the
myslqadmin command use the help command as shown below. It will display a list of available options.
We have tried our best to include almost all of the
‘mysqladmin‘ commands with their examples in this article, still, if we’ve missed anything, please do let us know via comments and don’t forget to share with your friends.
Using the mysqldump CommandThe mysqldump command creates a text version of the database. Specifically, it creates a list of SQL statements that can be used to restore/recreate the original database.
The syntax is:$ mysqldump -u [uname] -p[pass] [dbname] > [backupfile.sql]
[uname] Your database username
[pass] The password for your database
[dbname] The name of your database
[backupfile.sql] The filename for your database backup
You can dump a table, a database, or all databases.
To dump all MySQL databases on the system, use the --all-databases shortcut:
Restoring a MySQL Database
Use this method to rebuild a database from scratch:
- $ mysql -u [username] -p [password] [database_to_restore] < [backupfile]
Use this method to import into an existing database (in other words to restore a database that already exists).
- $ mysqlimport [options] database textfile1
To restore your previously created custback.sql dump back to your 'Customers' MySQL database, you'd use:
- $ mysqlimport -u sadmin -p pass21 Customers custback.sql