InnoDB evolves, data file formats that are not
compatible with prior versions of
sometimes required to support new features. To help manage
compatibility in upgrade and downgrade situations, and systems that
run different versions of MySQL,
named file formats.
InnoDB currently supports two
named file formats, Antelope
Barracuda is the newest file format. It supports all
InnoDBrow formats including the newer COMPRESSED and DYNAMIC row formats. The features associated with COMPRESSED and DYNAMIC row formats include compressed tables, efficient storage of off-page columns, and index key prefixes up to 3072 bytes (
innodb_large_prefix). See Section 15.11, “InnoDB Row Storage and Row Formats”.
This section discusses enabling
formats for new
InnoDB tables, verifying
compatibility of different file formats between MySQL releases, and
identifying the file format in use.
InnoDB file format settings do not apply to tables stored in general tablespaces. General tablespaces provide support for all row formats and associated features. For more information, see Section 15.7.9, “InnoDB General Tablespaces”.
The following file format configuration parameters have new default values:
The following file format configuration parameters are deprecated in and may be removed in a future release:
The file format configuration parameters were provided for
creating tables compatible with earlier versions of
InnoDB in MySQL 5.1. Now that MySQL 5.1 has
reached the end of its product lifecycle, the parameters are no
longer required. Future removal of the
innodb_file_format parameter will
require a new mechanism for managing compatibility of
InnoDB tables and tablespaces among different
versions of MySQL.