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MySQL 5.5 Reference Manual  /  ...  /  Downgrading the File Format

14.13.4 Downgrading the File Format

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 downgrade the tablespace is to re-create the table and its indexes. The easiest way to recreate a table and its indexes is to use the command:

ALTER TABLE t ROW_FORMAT=COMPACT;

on each table that you want to downgrade. The COMPACT row format uses the file format Antelope. It was introduced in MySQL 5.0.3.