MySQL raises EE_FILENOTFOUND (error 29) when it cannot locate a required table, log, or temporary file on the server filesystem.
MySQL Error 29: EE_FILENOTFOUND means the server cannot locate a referenced table, log, or temp file. Verify datadir paths, mount points, and file permissions, then restore or recreate the missing file. Correcting path or ownership typically fixes the issue.
File '%s' not found (OS errno %d - %s)
MySQL throws error 29 with the condition name EE_FILENOTFOUND when it fails to open a file that the query or internal process expects. The complete message is: File '%s' not found (OS errno %d - %s).
The placeholder %s is the filename, while %d and %s surface the operating-system error code and description.
The failure stops the current statement and may leave the database in an inconsistent state until fixed.
Missing or renamed table files (.ibd, .frm), logs, or temp files trigger the error.
Incorrect datadir paths in my.cnf or ALTER TABLE paths can also mislead the server.
Filesystem issues such as unmounted network volumes, deleted partitions, or permission changes often remove MySQL’s access to expected files, producing EE_FILENOTFOUND.
First, identify the exact file in the error text. Confirm its existence with ls or Windows Explorer.
If absent, restore from backup or recreate the object with proper DDL.
If the file exists, check user and group ownership (typically mysql:mysql) and chmod 660 or 664. Also confirm that datadir and tmpdir in my.cnf point to the correct mounted paths.
After accidental table deletion, restoring the .ibd and .frm pair from the nightly backup and running FLUSH TABLES usually resolves the error.
When a Docker container restarts without a mounted volume, MySQL loses data files.
Re-mount the host volume and restart mysqld to bring the files back into view.
Store the MySQL datadir on persistent storage with proper backups. Automate daily checks that verify the presence and permissions of critical files.
Use MySQL’s internal tools (mysqldump, mysqlpump) for migration instead of manual file copies. In Galaxy, endorsed backup scripts help teams standardize safe export paths.
Error 13 (ER_ACCESS_DENIED_ERROR) appears when permissions, rather than existence, block file access.
Correct by adjusting chmod and chown, not by restoring files.
Error 126 (ER_NOT_KEYFILE) arises when MySQL finds a corrupted index file. Running REPAIR TABLE or rebuilding the index typically fixes it.
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Yes. It halts the executing statement and may indicate data loss. Treat it with priority.
Only for temporary files. For tables or logs, restore from backup or re-export data to avoid corruption.
Galaxy’s versioned queries avoid manual datadir edits and provide workspace backups, reducing the chance of file removal outside MySQL.
It may grant access but weakens security. Correct owner to mysql:mysql and use 660 or 664 permissions instead.
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