Database engine difference of InnoDB, MyISAM, Memory
This is the default storage engine for MySQL 5.5 and higher. It provides transaction-safe (ACID compliant) tables, supports FOREIGN KEY referential-integrity constraints. It supports commit, rollback, and crash-recovery capabilities to protect data. It also support row-level locking. It’s “consistent nonlocking reads” increases performance when used in a multiuser environment. It stores data in clustered indexes which reduces I/O for queries based on primary keys.
This storage engine, manages non transactional tables, provides high-speed storage and retrieval, supports full text searching.
Provides in-memory tables, formerly known as HEAP. It sores all data in RAM for faster access than storing data on disks. Useful for quick looks up of reference and other identical data.
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