Someone has given me a copy of a database full of FRM, MYD, and MYI files. Trying to open it in my newer MySQL version gives an error that I need to run mysql_upgrade. I don't want to change the files at all, so I want to install the same version of MySQL that was used to create the database. Is there some way to identify the creation version from looking at these files?

  • You might be able to run it with the --upgrade-system-tables option. This should leave the user-defined schemas alone. Please see here: dev.mysql.com/doc/refman/5.7/en/mysql-upgrade.html Always back up the original files first before you run something and you can always restore from the backups if what you try doesn't work.
    – raphael75
    Aug 1, 2019 at 19:48
  • Also, check here: stackoverflow.com/questions/879176/…
    – raphael75
    Aug 1, 2019 at 19:52
  • @raphael75 - That sounds backwards. The frm/myd/myi files in the database probably need fixing, not the system tables.
    – Rick James
    Aug 1, 2019 at 22:00
  • Do you have the mysql schema (user.MYD, user.MYI, ...) ??? Aug 2, 2019 at 13:56

1 Answer 1


Open the .frm file with a hex editor. Go to offset 0x33 and read four bytes. Convert to decimal, keeping your endianness in mind.


  • c0c30000 --> c3c0 --> 50112 --> version 5.1.12
  • 64c50000 --> c564 --> 50532 --> version 5.5.32
  • b2860100 --> 186b2 --> 100018 --> version 10.0.18 (MariaDB)
  • 19870100 --> 18719 --> 100121 --> version 10.1.21 (MariaDB)


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