Each InnoDB tablespace file (with a name matching
*.ibd) is tagged with the file format used to
create its table and indexes. The way to modify the file format is
to re-create the table and its indexes. The easiest way to
recreate a table and its indexes is to use the following command
on each table that you want to modify:
ALTER TABLE t ROW_FORMAT=format_name;
If you are modifying the file format to downgrade to an older MySQL version, there may be incompatibilities in table storage formats that require additional steps. For information about downgrading to a previous MySQL version, see Section 2.11, “Downgrading MySQL”.