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5.11.2. The Error Log

The error log file contains information indicating when mysqld was started and stopped and also any critical errors that occur while the server is running. If mysqld notices a table that needs to be automatically checked or repaired, it writes a message to the error log.

On some operating systems, the error log contains a stack trace if mysqld dies. The trace can be used to determine where mysqld died. See Section E.1.4, “Using a Stack Trace”.

If mysqld dies unexpectedly and mysqld_safe needs to restart it, mysqld_safe writes a restarted mysqld message to the error log.

You can specify where mysqld stores the error log file with the --log-error[=file_name] option. If no file_name value is given, mysqld uses the name host_name.err and writes the file in the data directory. If you execute FLUSH LOGS, the error log is renamed with the suffix -old and mysqld creates a new empty log file. (No renaming occurs if the --log-error option was not given.)

If you do not specify --log-error, or (on Windows) if you use the --console option, errors are written to stderr, the standard error output. Usually this is your terminal.

On Windows, error output is always written to the .err file if --console is not given.

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