MyISAM was the default storage engine from MySQL 3.23 until it was replaced by InnoDB in MariaDB and MySQL 5.5. It's a light, non-transactional engine with great performance, is easy to copy between systems and has a small data footprint.

You're encouraged to rather use the Aria storage engine for new applications, which has even better performance and the goal of being crash-safe.

Until MariaDB 10.4, system tables used the MyISAM storage engine.

Title Description
MyISAM Overview Light, non-transactional storage engine
MyISAM System Variables MyISAM system variables.
MyISAM Storage Formats The MyISAM storage engine supports three different table storage formats
MyISAM Clients and Utilities Clients and utilities for working with MyISAM tables
MyISAM Index Storage Space Regular MyISAM tables make use of B-tree indexes
MyISAM Log Records all changes to MyISAM tables
Concurrent Inserts Under some circumstances, MyISAM allows INSERTs and SELECTs to be executed concurrently
Segmented Key Cache Collection of structures for regular MyISAM key caches
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