Mysql Slow Problem record database statement _mysql

Need to open a slow query output of an organ: log_slow_queries. Can be set in the MySQL configuration file (my.ini/my.cnf) or through the MySQL client temporary settings. The advantage of the second approach is that you can take the settings into effect without restarting the MySQL service. Let's try this one:
First connect to the MySQL server through the client, and enter the following statement:
SET GLOBAL log_slow_queries = on;
SET GLOBAL long_query_time = 3;

This allows MySQL to record the SQL statement that takes >=3 seconds and output it to a slow query log file. Here's the question, where is this slow query log file? As follows, execute the following statement in the MySQL client:
Show variables like ' slow_query_log_file ';
You'll see the MySQL slow query log file location. Mine is:/usr/local/mysql/data/host-slow.log.