mysql5.5 中 innodb 和 mysiam 的区别

Table 14.1 InnoDB Storage Engine Features

Storage limits	64TB	Transactions	Yes	Locking granularity	Row
MVCC	Yes	Geospatial data type support	Yes	Geospatial indexing support	Yes[a]
B-tree indexes	Yes	T-tree indexes	No	Hash indexes	No[b]
Full-text search indexes	Yes[c]	Clustered indexes	Yes	Data caches	Yes
Index caches	Yes	Compressed data	Yes[d]	Encrypted data[e]	Yes
Cluster database support	No	Replication support[f]	Yes	Foreign key support	Yes
Backup / point-in-time recovery[g]	Yes	Query cache support	Yes	Update statistics for data dictionary	Yes

^[a] InnoDB support for geospatial indexing is available in MySQL 5.7.5 and higher.

^[b] InnoDB utilizes hash indexes internally for its Adaptive Hash Index feature.

^[c] InnoDB support for FULLTEXT indexes is available in MySQL 5.6.4 and higher.

^[d] Compressed InnoDB tables require the InnoDB Barracuda file format.

^[e] Implemented in the server (via encryption functions), rather than in the storage engine.

^[f] Implemented in the server, rather than in the storage engine.

^[g] Implemented in the server, rather than in the storage engine.

Table 15.2 MyISAM Storage Engine Features

Storage limits	256TB	Transactions	No	Locking granularity	Table
MVCC	No	Geospatial data type support	Yes	Geospatial indexing support	Yes
B-tree indexes	Yes	T-tree indexes	No	Hash indexes	No
Full-text search indexes	Yes	Clustered indexes	No	Data caches	No
Index caches	Yes	Compressed data	Yes[a]	Encrypted data[b]	Yes
Cluster database support	No	Replication support[c]	Yes	Foreign key support	No
Backup / point-in-time recovery[d]	Yes	Query cache support	Yes	Update statistics for data dictionary	Yes

^[a] Compressed MyISAM tables are supported only when using the compressed row format. Tables using the compressed row format with MyISAM are read only.

^[b] Implemented in the server (via encryption functions), rather than in the storage engine.

^[c] Implemented in the server, rather than in the storage engine.

^[d] Implemented in the server, rather than in the storage engine.