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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https://mariadb.com/kb/en/myisam-storage-engine/