unknown variable ’log_slow_queries=/var/log/mysql/mysql-slow.log'

# mysql5.6版本以上，取消了参数log-slow-queries，更改为slow-query-log-file

# 还需要加上 slow_query_log = on 否则，还是没用

#log-slow-queries = /var/log/mysql/mysql-slow.log

slow_query_log = on

slow-query-log-file = /var/log/mysql/mysql-slow.log

long_query_time = 2