The slow query log can either be written to the slow_log table in the mysql database by setting the log_output system variable to TABLE. For example: SET GLOBAL log_output='FILE' It can be changed dynamically with SET GLOBAL. However, it can be explicitly chosen by setting the log_output system variable to FILE. The slow query log is output to a file by default. To choose the slow query log output destination, set the log_output system variable. The slow query log can either be written to a file on disk, or it can be written to the slow_log table in the mysql database. Choosing the Slow Query Log Output Destination The log file name is relative to the datadir directory. The log-basename cannot be an absolute path. It can be set in a server option group in an option file prior to starting up the server. The slow query log filename will be built by adding -slow.log to this prefix. slow query log, general query log, error log, binary logs, etc.). Slow_query_log_file=/var/log/mysql/mariadb-slow.logĪnother way to configure the slow query log filename is to set the log-basename option, which configures MariaDB to use a common prefix for all log files (e.g. However, the slow_query_log_file system variable can also be an absolute path. If it is a relative path, then the slow_query_log_file is relative to the datadir directory. For example: SET GLOBAL slow_query_log_file='mariadb-slow.log' One way to configure the slow query log filename is to set the slow_query_log_file system variable. For example: īy default, the slow query log is written to $-slow.log in the datadir directory. It can also be set in a server option group in an option file prior to starting up the server. For example: SET GLOBAL slow_query_log=1 To enable the slow query log, set the slow_query_log system variable to 1. The slow query log is disabled by default. The number of rows affected by the slow query are also recorded in the slow query log. Note that, if your queries contain user's passwords, the slow query log may contain passwords too. The slow query log is a record of SQL queries that took a long time to perform. Rotating the Slow Query Log on Unix and Linux.Variables Related to the Slow Query Log.Configuring the Slow Query Log Verbosity.Enabling the Slow Query Log for Specific Criteria.Logging Queries That Examine a Minimum Row Limit. Disabling the Slow Query Log for Specific Statements.Disabling the Slow Query Log for a Session.Choosing the Slow Query Log Output Destination.Configuring the Slow Query Log Filename.
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