问题
I am using Rails application with Postgres 9.3 database and doing some performance fixes. I would like to know how to find out slowest queries in log files. let say queries taking more then 30ms.
回答1:
In postgresql.conf you should uncomment line
#log_min_duration_statement = -1
and change its value to 30. This way queries longer than 30ms will be logged
来源：https://stackoverflow.com/questions/41746897/postgresql-9-3-log-slow-queries