Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP

SQL Command

MariaDB Administration Commands

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Checking version of your MariaDB installation

To check the current version of your DB installation, type following command in your terminal

$ mysql –version

This command provide you with the current version of DB. Alternatively you can also run below mentioned command for detailed view on version,

$ mysqladmin –u root –p version

Logging into mariadb

To log into the mariadb server, run

$ mysql –u root –p

& then enter password to login to the session.

Showing all database

To show all the databases that your maridb currently has, run

$ show databases;

after you are logged into mariadb.

Creating new databases

To create a new database in mariadb, run

$ create database dan;

when logged into mariabdb. To create a database directly from terminal, run

$ mysqladmin -u user -p create dan

Here, dan is the name of the new database.

Deleting a database

To delete a database, run

$ drop database dan;

from the logged in session of mariadb. Alternatively you can also use,

$ mysqladmin –u root –p drop dan

Note:- If you are getting an ‘access denied’ error while running the mysqladmin commands, that might be because we have not given rights to root. To do so, run the command mentioned in point 7, replacing name of the user with root.

Creating new user

To create a new user for database, run

$ CREATE USER ‘dan’@’localhost’ IDENTIFIED BY ‘password’;

Granting access to user for a database

For providing access to user for a single database, run

$ GRANT ALL PRIVILEGES ON test.* to ‘dan’@’localhost’;

This will provide user dan complete access over database named test. We can also grant SELECT, INSERT , DELETE permissions to user.

To provide access to all database, replace test with * i.e.

$ GRANT ALL PRIVILEGES ON *.* to ‘dan’@’localhost’;

Creating backup/dump of database

To create of a single database, run the following command from your terminal window,

$ mysqldump –u root –p database_name>db_backup.sql

To create backup of multiple databases in single command,

$ mysqldump –u root –p – – databases db1 db2 > db12_backup.sql

To create dump of all databases in single command,

$ mysqldump –u root –p – – all-databases >all_dbs.sql

Restoring database from the dump

To restore database from a dump, run

$ mysql –u root –p database_name<db_backup.sql

But this command will work only when there is no previous database by the same name. if you want to restore database data to any already created database, we need to use ‘mysqlimport ’ command,

$ mysqlimport –u root –p database_name<db_backup.sql

Changing password for a user in mariadb

We are going to change password of ‘root’ for this example but you can use the below process to change password of any user,

$ mysql –u root –p

$ use mysql;

& then run the following ,

$ update user set password=PASSWORD(‘your_new_password_here’) where User=’root’;

Next, reload the privileges,

$ flush privileges;

& then exit the session.

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