4092
MySQLERRORCommonHIGH confidence
InnoDB data file is unreadable
Production Risk
High — Unreadable data files make the affected tablespace inaccessible.
Why it happens
- 1The data file is corrupted due to a disk failure or crash.
- 2The file belongs to a different MySQL version with an incompatible format.
- 3The file was encrypted but the keyring key is unavailable.
Fix 1
Check error log for specific corruption details
Why this works
The MySQL error log usually contains more specific information about why the file is unreadable.
Fix 2
Restore from backup
Why this works
If the file is corrupted or from an incompatible version, restore from a clean backup.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 4092 ER_INNODB_DATAFILE_UNREADABLE
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