Error 1026 signals that MySQL failed to write a file because the operating system returned an I/O error such as no space, permission denied, or file-system corruption.
MySQL Error 1026 (ER_ERROR_ON_WRITE) happens when the server cannot write a temporary, log, or data file due to OS-level issues like disk-full or missing permissions. Freeing space or granting proper file-system privileges resolves the error.
Error writing file '%s' (errno: %d - %s)
MySQL raises Error 1026 when an internal or user-requested file write fails. The message shows the target file path plus the operating-system errno and description, confirming the fault lies below the SQL layer.
The error surfaces while writing temporary tables, binary logs, InnoDB redo or undo logs, SELECT … INTO OUTFILE results, or any operation needing extra disk space.
Heavy workloads that stress the file system expose the problem quickly.
Write failures stop queries, break replication, and can crash the server. Ignoring them risks data loss, delayed backups, and prolonged downtime, so immediate investigation and correction are critical.
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The target partition is full, preventing MySQL from extending data or log files.
The mysql OS user lacks write access to the directory or file path referenced in the error.
ulimit, container quotas, or Windows FAT32 4 GB limits block further growth of a file.
A crash caused the volume to remount read only, or corruption forced the kernel to block writes.
Raid, SAN, or cloud-block storage problems generate I/O errors that MySQL surfaces as Error 1026.
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The error message prints the full path. Review the MySQL error log for the same entry with added context.
Yes. If the master cannot write binary logs, replicas lag or stop entirely until the issue is fixed.
Often yes. Free disk space or adjust permissions, then retry the statement. A restart is only required when data files are stuck open or the volume is read only.
Galaxy’s editor highlights failed queries, preserves their history, and lets teams annotate the root cause, reducing repeat incidents.
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