MySQL - Debian 7 - включение error лога

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# cat /etc/debian_version
7.7

Комментируем строки в /etc/mysql/conf.d/mysqld_safe_syslog.cnf

# cat  /etc/mysql/conf.d/mysqld_safe_syslog.cnf
#[mysqld_safe]
#syslog

Добавляем в две секции /etc/mysql/my.cnf:

[mysqld_safe]
log_error=/var/log/mysql/mysql_error.log
[mysqld]
log_error=/var/log/mysql/mysql_error.log

и перезапускаем mysql.