InnoDB is a high-reliability and high-performance
storage engine for MySQL. Key advantages of
InnoDB tables arrange your data on disk to
optimize common queries based on
primary keys. Each
InnoDB table has a primary key index called
the clustered index
that organizes the data to minimize I/O for primary key lookups.
To maintain data integrity,
KEY referential-integrity constraints.
You can freely mix
InnoDB tables with tables
from other MySQL storage engines, even within the same
statement. For example, you can use a join operation to combine
MEMORY tables in a single query.
InnoDB has been designed for maximum
performance when processing large data volumes. Its CPU
efficiency is probably not matched by any other disk-based
relational database engine.
InnoDB storage engine maintains its own
buffer pool for caching data and indexes in main memory.
InnoDB stores its tables and indexes in a
tablespace, which may consist of several files (or raw disk
partitions). This is different from, for example,
MyISAM tables where each table is stored using
InnoDB tables can be very large
even on operating systems where file size is limited to 2GB.
The Windows Essentials installer makes
MySQL default storage engine on Windows, if the server being
The MySQL Enterprise Backup product lets you back up a running MySQL
MyISAM tables, with minimal disruption to
operations while producing a consistent snapshot of the database.
When MySQL Enterprise Backup is copying
tables, reads and writes to both
MyISAM tables can continue. During the copying of
MyISAM tables, reads (but not writes) to those
tables are permitted. In addition, MySQL Enterprise Backup supports
creating compressed backup files, and performing backups of subsets
InnoDB tables. In conjunction with MySQL’s
binary log, users can perform point-in-time recovery. MySQL
Enterprise Backup is commercially licensed. For a more complete
description of MySQL Enterprise Backup, see
Section 22.2, “MySQL Enterprise Backup”.
A forum dedicated to the
InnoDB storage engine is
available at http://forums.mysql.com/list.php?22.
InnoDB is published under the same GNU GPL
License Version 2 (of June 1991) as MySQL. For more information on
MySQL licensing, see http://www.mysql.com/company/legal/licensing/.