MariaDB



MariaDB Installation

MariaDB repo is included in RHEL 7 or CentOS 7, to install use yum.
Install the MariaDB Client and Server:
# yum install mariadb mariadb-server

Verify the installation:
# which mysql
/usr/bin/mysql

Start MariaDB and Enable it at boot time:
# systemctl start mariadb
# systemctl enable mariadb

Secure it by running the mysql_secure_installation scrip.
Add a root password and remove anonymous users:

# mysql_secure_installation
/usr/bin/mysql_secure_installation: line 379: find_mysql_client: command not found

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] Y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] Y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] Y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] Y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] Y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

MariaDB and MySQL Commands

MariaDB commands are the same as MySQL and the Examples are shown in CAPS, Commands are not case sensitive.

To get MariaDB version and status:
mysqladmin -u root -p version status

$ mysqladmin -u root -p version status
Enter password: 
mysqladmin  Ver 9.0 Distrib 5.5.44-MariaDB, for Linux on x86_64
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Server version		5.5.44-MariaDB
Protocol version	10
Connection		Localhost via UNIX socket
UNIX socket		/var/lib/mysql/mysql.sock
Uptime:			2 days 44 min 44 sec

Threads: 1  Questions: 8  Slow queries: 0  Opens: 0  Flush tables: 2
Open tables: 26  Queries per second avg: 0.000
Uptime: 175484  Threads: 1  Questions: 8  Slow queries: 0  Opens: 0
Flush tables: 2  Open tables: 26  Queries per second avg: 0.000

Create a Database word_press
MariaDB [(none)]> CREATE DATABASE word_press;

Delete a Database
> DROP DATABASE word_press;

Select a Database and Create a Table
> USE word_press;
> CREATE TABLE wp_users
( user INT AUTO_INCREMENT PRIMARY KEY,
user_name VARCHAR(255), email VARCHAR(50) );

Show and describe

MariaDB [word_press]> SHOW tables;
+----------------------+
| Tables_in_word_press |
+----------------------+
| wp_users             |
+----------------------+
1 row in set (0.00 sec)

MariaDB [word_press]> DESCRIBE wp_users;
+-----------+--------------+------+-----+---------+----------------+
| Field     | Type         | Null | Key | Default | Extra          |
+-----------+--------------+------+-----+---------+----------------+
| user      | int(11)      | NO   | PRI | NULL    | auto_increment |
| user_name | varchar(255) | YES  |     | NULL    |                |
| email     | varchar(50)  | YES  |     | NULL    |                |
+-----------+--------------+------+-----+---------+----------------+
3 rows in set (0.01 sec)

Backing up the Database:
$ mysqldump -u username -p word_press > word_press.sql

Restoring the Database:
$ mysql -u username -p word_pres < word_press.sql