<p>MySQL raises error 1377 when a fatal problem prevents purging of binary logs.</p>
<p>ER_BINLOG_PURGE_FATAL_ERR occurs when MySQL fails to delete or rename a binary log during PURGE. Check file permissions, replication locks, and disk health, then run PURGE BINARY LOGS or RESET MASTER to clear old logs.</p>
Fatal error during log purge
MySQL error 1377 appears when the server tries to purge old binary log files but encounters an unrecoverable problem. The purge operation halts and the server raises the fatal error, preventing binary log housekeeping and possibly blocking new log rotations.
The error normally shows in the error log and is returned to clients running PURGE BINARY LOGS or CHANGE MASTER commands. Because intact binary logs are critical for replication and point-in-time recovery, resolving the issue quickly is essential.
The server cannot delete or rename a log file required for purging. File-system permission issues, missing files, disk corruption, or an active replication thread holding the file open are frequent triggers. MySQL treats these conditions as fatal to protect data integrity.
Hardware problems such as full disk, read-only mount, or unexpected server crash can also leave the binary log index out of sync with actual files, causing the purge routine to fail.
First, stop replication threads or sessions using the affected binary log. Then verify file presence and permissions at the server's datadir. Correct ownership and make sure the MySQL user can delete the files. If the index file is wrong, edit or rebuild it carefully.
When the file system is healthy and permissions are correct, rerun PURGE BINARY LOGS or simply restart the server. MySQL will retry the purge automatically. Use safe commands like RESET MASTER in single-server setups once backups are confirmed.
On busy replica hosts, an IO_THREAD keeps the oldest log open, blocking deletion. Issue STOP SLAVE SQL_THREAD; PURGE BINARY LOGS TO 'binlog.000123'; START SLAVE to clear space.
After a crash, missing binlog files break the index. Recreate missing empty files or adjust the index line numbers to match existing logs, then restart MySQL to finish the purge.
Enable automatic purge with expire_logs_days or binlog_expire_logs_seconds so logs rotate before disk pressure builds. Monitor free disk space and MySQL error logs with alerts to detect purge failures early.
Always stop replication threads before manual PURGE commands and ensure backups complete before log removal. Keep datadir on a reliable file system and run periodic fsck checks.
Error 1372 ER_BINLOG_PURGE_PROHIBITED arises when binary log purge is disabled by active replication; stopping slave threads resolves it.
Error 1526 ER_SLAVE_FATAL_ERROR involves replication thread crash due to corrupted log; restoring from a clean backup or skipping damaged events repairs replication.
The MySQL process lacks delete or rename privileges on the binary log directory, causing the purge routine to fail.
Replica IO or SQL threads keep the oldest log file open, preventing its removal during purge.
A crash or manual file removal leaves gaps between the binary log index and actual files, triggering the fatal error.
Read-only mounts, disk full, or inode corruption stop MySQL from modifying files needed for purge.
Occurs when you attempt to purge logs that are still needed by replication. Resolve by adjusting replication state or stopping replicas.
Shows a fatal replication thread error often caused by corrupted binary log entries. Fix by skipping or replacing problematic events.
Raised when a replica cannot read the master's binary log due to corruption or missing file. Resync or reclone the replica.
Manual deletion is risky because it can desync the binlog index. Always use PURGE BINARY LOGS or let expire_logs_days handle removal.
RESET MASTER recreates the log index and removes all logs. It resolves many purge errors on standalone servers but breaks replication, so use carefully.
If the master cannot purge logs, replication continues, but disk usage grows. On a slave, the error stops local housekeeping only.
Galaxy's SQL editor surfaces error logs in real time, embeds best-practice snippets, and warns when PURGE commands might break replication, reducing purge errors.
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