InnoDB vs MyISAM

[jimb]

InnoDB stores data rows physically in primary key order while MyISAM typically stores them mostly in the order in which they are added. This corresponds to the MS SQL Server feature of “Clustered Indexes” and the Oracle feature known as "index organized tables."

InnoDB currently does not provide the compression and terse row formats provided by MyISAM, so both the disk and cache RAM required may be larger.

InnoDB recovers from a crash by replaying its logs. MyISAM must fully scan and repair or rebuild any indexes or possibly tables which had been updated but not fully flushed to disk.

MyISAM is the default storage engine for the MySQL database. In recent MySQL versions, the InnoDB engine has widely started to replace MyISAM due to its support for transactions, referential integrity constraints, and higher concurrency.

Each MyISAM table is stored on disk in three files. The files have names that begin with the table name and have an extension to indicate the file type. A .frm file stores the table definition. The data file has a .MYD (MYData) extension. The index file has a .MYI (MYIndex) extension.

To specify explicitly that you want a MyISAM table, indicate that with an ENGINE table option:
mysql> CREATE TABLE t (i INT) ENGINE = MYISAM;

Note that MySQL 5.0 does not support ISAM.

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