Choosing MySQL vs MariaDB in 2026

Introduction: The relational database giants

MySQL and MariaDB are two of the most widely used open-source relational database management systems (RDBMS) in the world. They power WordPress, Nextcloud, custom e-commerce engines, and enterprise web applications.

Although MariaDB began as a fork of MySQL, the two projects have diverged significantly over the past 15 years. This guide explains how they differ, compatibility considerations, and how to choose the right one for your architecture.

The historical context: Why MariaDB was created

In 2008, Sun Microsystems acquired MySQL AB. In 2010, Oracle Corporation acquired Sun Microsystems, gaining ownership of MySQL.

Concerned about Oracle's commercial stewardship of an open-source project, MySQL's original lead developer, Michael "Monty" Widenius, created a fork in 2009 called MariaDB (named after his younger daughter Maria, just as MySQL was named after his older daughter My).

Initially, MariaDB was a 1:1 drop-in replacement for MySQL 5.5. Today, however, MySQL (now on version 8.x/9.x) and MariaDB (10.x/11.x) are distinct engines with different feature sets and internal optimizations.

Key technical differences

1. Default storage engines & features

• MySQL: Focuses heavily on the InnoDB storage engine, with optimizations for heavy transactional workloads. MySQL 8 introduced a native transactional data dictionary.
• MariaDB: Includes additional specialized storage engines out of the box:
• Aria: A crash-safe replacement for legacy MyISAM.
• ColumnStore: Designed for real-time big data analytical queries (OLAP).
• Built-in thread pooling included in the free community edition (MySQL only includes high-performance thread pooling in its paid Enterprise edition).

2. Default authentication plugins

• MySQL 8+: Defaults to caching_sha2_password. This provides enhanced cryptographic hashing, but older database clients, legacy PHP extensions, or Docker containers may fail to connect with:

Authentication plugin 'caching_sha2_password' cannot be loaded.

• MariaDB: Defaults to unix_socket for local system authentication (allowing the local root Linux user to run sudo mariadb without a password prompt), and standard mysql_native_password for remote network users.

3. JSON support

• MySQL: Stores JSON in an internal, optimized binary format for rapid search indexing.
• MariaDB: Stores JSON as text strings (TEXT alias) and uses JSON validation functions (JSON_VALID) to maintain standard SQL compliance.

Connecting via CLI: Command breakdown

Both engines provide command-line client tools with nearly identical syntax:

# Connecting to MySQL
mysql -h 127.0.0.1 -P 3306 -u dbuser -p target_database

# Connecting to MariaDB (or using the modern mariadb alias)
mariadb -h 127.0.0.1 -P 3306 -u dbuser -p target_database

Command & flag breakdown

• mysql / mariadb: The command-line interactive SQL shell.
• -h 127.0.0.1: Specifies the host address to connect to. When using 127.0.0.1, the client connects via TCP/IP. If you specify -h localhost, the client attempts to connect via a local Unix socket file (/var/run/mysqld/mysqld.sock).
• -P 3306: Specifies the TCP port (default is 3306).
• -u dbuser: The database user account name.
• -p: Prompts securely for the user's password in the terminal without revealing it in shell history or process tables.
• target_database: The specific database schema to select upon connection.

Practical decision matrix