The server cannot read a required file, usually a table or temporary file, due to permissions, disk issues, or corruption.
MySQL Error 1024: ER_ERROR_ON_READ occurs when the server fails to read a file needed for a query or table operation, often because of wrong permissions, missing files, corrupted storage, or full disks. Restore file access, correct permissions, or repair the table to fix the issue.
Error reading file '%s' (errno: %d - %s)
Error reading file '%s' (errno: %d - %s)
The server attempted to read a file required for executing a query or maintaining a table and failed. MySQL surfaces the generic HY000 state because the root cause lies outside SQL syntax, usually in the operating system's file subsystem.
The placeholder %s shows the file path, while errno and text specify the low-level OS error.
Understanding this mapping accelerates troubleshooting and minimizes downtime.
The error appears during SELECT, INSERT, UPDATE, or DDL statements that touch the affected file. It can also fire during replication, backup, or recovery tasks that scan table files.
Because MySQL halts the operation immediately, applications may see aborted connections and rolled-back transactions, making rapid remediation critical.
Persistent ER_ERROR_ON_READ indicates possible data loss or storage corruption.
Ignoring it risks inconsistent backups, broken replication, and prolonged service outages.
Prompt resolution preserves data integrity, maintains availability, and avoids cascading errors such as ER_ERROR_ON_WRITE or InnoDB crash recovery loops.
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MySQL's OS user lacks read permission on the referenced .frm, .ibd, .MYD, or temporary file after a manual copy or chmod.
A table file was accidentally deleted, renamed, or overwritten, leaving metadata that still references it.
Bad sectors or an abrupt shutdown corrupted pages.
InnoDB detects the damage when reading.
The OS returns ENOSPC or EDQUOT, blocking reads from the temporary directory or data directory.
NFS or SAN latency causes timeouts or stale handles, resulting in read errors reported back to MySQL.
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The error message includes the full path. You can also inspect the MySQL error log or run SHOW ENGINE INNODB STATUS for detailed context.
If the issue is simple permissions or disk space, you can often fix it online. Corruption repairs may require table locking or maintenance windows.
No. Use ALTER TABLE ... DISCARD/IMPORT TABLESPACE or logical dump and restore methods for InnoDB tables.
Galaxy's SQL editor highlights OS-level errors in result panels, logs them centrally, and its AI copilot suggests permission and disk checks, speeding resolution for engineering teams.
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