Can We Recover MySQL Table Structure from FRM and IBD Files Only?

Recover MySQL table structures from FRM and IBD files only

Question:

Users often encounter situations where they need to restore a database but can only access the FRM and IBD files.

Can the table structure be restored?

Yes, table structure can be restored from FRM file even without IB_LOG file.

Steps:

1. Extract SQL creation statement from FRM file:

• Install MySQL Utilities.
• Use the mysqlfrm --diagnostic command to generate SQL create statements for each FRM file.
• The output will contain statements similar to:

CREATE TABLE `example_table` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(150) NOT NULL,
  `photo_url` varchar(150) NOT NULL,
  `password` varchar(600) NOT NULL,
  `active` smallint(6) NOT NULL,
  `plan` int(11) NOT NULL,
  PRIMARY KEY `PRIMARY` (`id`)
) ENGINE=InnoDB;

2. Use SQL statements to create tables:

• Delete any existing tables (if necessary).
• Execute the SQL create statement obtained in step 1 to create a table with the same structure as the original table.

3. Recover data:

• Use the following command to delete new table data:

ALTER TABLE example_table DISCARD TABLESPACE;

• Delete the corresponding IBD file in the table directory.
• Copy original IBD files to directory:

cp backup/example_table.ibd /path/to/example_table.idb

• Make sure the IBD file has the correct ownership and permissions.
• Import old data:

ALTER TABLE example_table IMPORT TABLESPACE;

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