MySQL Turn on slow query

MySQL Version: 5.6

System: centos6.5

Slow query function is to record the execution time is greater than its own set threshold time, so that you can know when the system is running when the SQL statement execution slow, to find out why the system is running slowly, the following settings:

Added in MySQL config file my.cnf

Log-slow-queries=/var/lib/mysql/slowquery.log (Specify the log file location, can be empty, the system will give a default file Host_name-slow.log)
long_query_time=2 (record over time, default is 10s, can support millisecond level)
Log-queries-not-using-indexes (log down without using the indexed query, depending on the situation to decide whether to open)
Log-long-format (if set, all queries that do not use the index will also be logged)

MySQL Turn on slow query