As InnoDB evolves, new on-disk data structures are sometimes required to support new features. Features such as compressed tables (see Section 14.7, “InnoDB Compressed Tables”), and long variable-length columns stored off-page (see Section 14.9, “InnoDB Row Storage and Row Formats”) require data file formats that are not compatible with prior versions of InnoDB. These features both require use of the new Barracuda file format.
All other new features are compatible with the original Antelope file format and do not require the 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, downgrading the file format, and file format names that may be used in the future.
Named File Formats.
InnoDB 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
Antelope. Future versions of
InnoDB may introduce a series of file formats,
identified with the
names of animals, in ascending alphabetic order.