MariaDB

Configuration files

• Ubuntu: /etc/mysql/mariadb.conf.d/50-server.cnf

• show variables
  • SHOW VARIABLES LIKE 'maria_group_commit';

Activities

1. Perform the following tasks:
   • Install MariaDB. For example in MacOS: brew install mariadb
   • Start and configure MariaDB.
   • Backup and restore a database
   • Create a simple database schema
   • Perform simple SQL queries against a database
   • Create a basic table

Install and start MariaDB in MacOS

• brew install mariadb
• Start MariaDB:

/usr/local/bin/mysql.server start (command is mysql but you are actually starting MariaDB)

Starting MariaDB
.180619 10:15:19 mysqld_safe Logging to '/usr/local/var/mysql/file.err'.
180619 10:15:19 mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
 SUCCESS! 

• Check MariaDB is running: /usr/local/bin/mysql.server status

 SUCCESS! MariaDB running (80662)

Create a table: CREATE TABLE

• Connect to database test, will be created in default MariaDB installation:

mysql test

• Create a basic table with two columns using the create table SQL statement:

create table my_first_table (my_first_column char, my_second_column char);

• Show tables so we can check our new created table is available:

MariaDB [test]> describe my_first_table;
+------------------+
| Tables_in_test   |
+------------------+
| my_first_table   |
+------------------+

• Show details about your new table:

MariaDB [test]> describe my_first_table;
+------------------+---------+------+-----+---------+-------+
| Field            | Type    | Null | Key | Default | Extra |
+------------------+---------+------+-----+---------+-------+
| my_first_column  | char(1) | YES  |     | NULL    |       |
| my_second_column | char(1) | YES  |     | NULL    |       |
+------------------+---------+------+-----+---------+-------+
2 rows in set (0.003 sec)

1. Show privileges: MariaDB [(none)]> show grants;
2. Allow remote root access: GRANT ALL PRIVILEGES on *.* to 'root'@'%' IDENTIFIED BY 'YOUR_PASSWORD';

Advanced Features

• Understand MariaDB wikipedia:partitioning (w:https://en.wikipedia.org/wiki/Comparison_of_relational_database_management_systems#Partitioning) and uses cases. SHOW PLUGINS to see if your version support it.
• Create a MariaDB Cluster using MariaDB /Galera Cluster/.

MariaDB [(none)]> SHOW VARIABLES LIKE 'thread_handling';
+-----------------+---------------------------+
| Variable_name   | Value                     |
+-----------------+---------------------------+
| thread_handling | one-thread-per-connection |
+-----------------+---------------------------+
1 row in set (0.00 sec)

Activities

1. Understand how to limit the number of threads to save memory for the database memory buffers: https://mariadb.com/kb/en/library/thread-pool-in-mariadb/

SHOW VARIABLES LIKE 'thread_handling';

See also

• Databases: PostgreSQL
• Wikipedia: MariaDB

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Original Source: https://en.wikiversity.org/wiki/MariaDB