As InnoDB evolves, new on-disk data structures are sometimes
required to support new features. Features such as compressed tables
(see Section 14.10, “InnoDB Compressed Tables”), long variable-length
columns stored off-page (see Section 14.12, “InnoDB Row Storage and Row Formats”),
and index key prefixes up to 3072 bytes
innodb_large_prefix) require data
file formats that are not compatible with prior versions of InnoDB.
These features require use of the new
Barracuda file format.
This section discusses enabling file formats for new InnoDB tables, verifying compatibility of different file formats between MySQL releases, identifying the file format in use, and downgrading the file format.
Named File Formats.
InnoDB 1.1 uses named file formats to help manage compatibility in
upgrade and downgrade situations, or heterogeneous systems running
different levels of MySQL. Currently,
Barracuda file formats are
supported. Barracuda is the
newest file format. It supports important InnoDB features such as
compressed tables and the
DYNAMIC row format
for more efficient BLOB storage. The original InnoDB file format,
which previously did not have a name, is now known as