Note It is common for Yum or APT package installations to configure an error log location under /var/log with an entry like log-error=/var/log/mysqld.log in a server configuration file. Using Syslog for the Error Log As of MySQL 5.7.5, it is possible to have mysqld write the error log to syslog on Unix and Unix-like systems, and to the Windows If no file is named, mysqld writes to the default log file. This default is used if --log-error is given without naming a log file. have a peek here
The default log file is
host_name.err in the data directory, unless the --pid-file option is specified. On Windows, logging to the Event Log is enabled by default and cannot be disabled. See Section B.5.2.11, “Communication Errors and Aborted Connections”. If no file is named, mysqld writes to the default log file. http://dev.mysql.com/doc/mysql/en/error-log.html
These log entries have a source of MySQL. Permitted values are 1 (errors only), 2 (errors and warnings), 3 (errors, warnings, and notes), with a default of 3. Before MySQL 5.7.2, messages use the local system time zone. Before MySQL 5.7.5, control of output to syslog on Unix and Unix-like systems is handled by mysqld_safe, which captures server error output and passes it to syslog.
If both options are present, their order does not matter: --console takes precedence and error messages go to the console. (In MySQL 5.5 and 5.6, the precedence is reversed: --log-error causes Contact Sales USA: +1-866-221-0634 Canada: +1-866-221-0634 Germany: +49 89 143 01280 France: +33 1 57 60 83 57 Italy: +39 02 249 59 120 UK: +44 207 553 8447 Japan: 0120-065556 log_syslog_tag: This variable defines a tag to add to the server identifier (mysqld) in syslog messages. Asp.net Error Logging If a file is named, mysqld writes to it, creating it in the data directory unless an absolute path name is given to specify a different directory.
In that case, the default name is the PID file base name with a suffix of .err in the data directory. Single Bit Error Logging Disabled Error Log Message Format As of MySQL 5.7.2, the log_timestamps system variable controls the timestamp time zone of messages written to the error log (as well as to general query log This indicates which part of the server produced the message, and is consistent with general query log and slow query log messages, which include the connection thread ID. https://mediatemple.net/community/products/dv/204403804/where-are-the-access_log-and-error_log-files-for-my-server If mysqld notices a table that needs to be automatically checked or repaired, it writes a message to the error log.
Error Log Verbosity As of MySQL 5.7.2, the log_error_verbosity system variable controls server verbosity for writing error, warning, and note messages to the error log. Ssis Error Logging To do so, use these system variables: log_syslog: Enable this variable to send the error log to syslog. The trace can be used to determine where mysqld exited. If the server writes error messages to the console, it sets the log_error system variable to stderr.
Removing the file name from the entry causes the default log file to be used, which is written to the data directory. See Section B.5.2.11, “Communication Errors and Aborted Connections”. Error Log Logs As of MySQL 5.7.5, information written to the Windows Event Log can be controlled using the log_syslog system variable, as described later. C# Error Logging Note As of MySQL 5.7.5, using mysqld_safe for syslog error logging is deprecated; you should use the server system variables instead.
log_syslog_facility: The default facility for syslog messages is daemon. For syslog output, a tag can be specified with --syslog-tag=
tag_val; this is appended to the mysqld server identifier with a leading hyphen. If mysqld_safe is used to start mysqld and mysqld exits abnormally, mysqld_safe notices this, restarts mysqld, and writes a mysqld restarted message to the error log. Check This Out Before MySQL 5.7.2, the log_warnings system variable controls warning logging to the error log.
If a file is named, mysqld writes to it, creating it in the data directory unless an absolute path name is given to specify a different directory. Error Logging In To Vboxwebsrv On Windows, the --log-error, --pid-file, and --console options affect error logging: Without --log-error, mysqld writes error messages to the default log file. mysqld_safe has three error-logging options, --syslog, --skip-syslog, and --log-error.
Set this variable to specify a different facility. By default, log_warnings is enabled (nonzero). If you specify --log-error in an option file in a [mysqld], [server], or [mysqld_safe] section, mysqld_safe finds and uses the option. Mysql Error Logging With --log-error[=
file_name], mysqld writes error messages to an error log file.
Otherwise, log_error indicates the error log file name. On Unix and Unix-like systems, mysqld writes error log messages as follows: Without --log-error, mysqld writes error messages to the console. To disable warning logging, set log_warnings to 0. The server logs messages about statements that are unsafe for statement-based logging if the value is greater than 0, and logs aborted connections and access-denied errors for new connection attempts if
For example, to rename the file and create a new one, use the following commands (assuming a log file name of
host_name.err): shell> mv
host_name.err host_name.err-old shell> mysqladmin flush-logs Permitted values are UTC (the default) and SYSTEM (local system time zone). As of MySQL 5.7.2, the ID included in error log messages is that of the thread within mysqld responsible for writing the message. In the following discussion, “console” means stderr, the standard error output; this is your terminal or console window unless the standard error output has been redirected.
If the value is greater than 2, the server logs aborted connections and access-denied errors for new connection attempts. This default is used if --log-error is not given, or is given without naming a log file.