To enable MySQL logging during runtime.

 To enable MySQL logging...

 We can enable logging in the cnf file as below;

    [mysqld]
    log = /var/log/mysqld.log
    log-error = /var/log/mysqld.error.log

 We can enable during run time by logging into the MySQL server and executing either of the below;

 To use the mysql.general_log table, do;

SET GLOBAL log_output = "TABLE";
SET GLOBAL general_log = 'ON';

 To use file logging, do;

SET GLOBAL log_output = 'FILE';
SET GLOBAL general_log_file = "/path_to_logfile/mysql.log";
SET GLOBAL general_log = 'ON';

 To disable, do;

SET GLOBAL general_log = 0;