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MySQL 5.7 Reference Manual
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15.10.4 Modifying 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 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:


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 2.11.2, “Downgrading MySQL”.

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