May 2018
Intermediate to advanced
576 pages
30h 25m
English
Another way to find slow queries is to set up PostgreSQL to log them all. So if you decide to monitor a query taking over 10 seconds, then set up logging queries over 10 seconds by executing the following:
postgres=# ALTER SYSTEM SET log_min_duration_statement = 10000;
Remember that the duration is in milliseconds. After doing this, reload PostgreSQL. All queries that are slow enough to exceed the threshold will be logged.
The PostgreSQL log files are usually located together with other log files; for example, on Debian/Ubuntu Linux, they are in the /var/log/postgresql/ directory.
You can also log every query, though that can often swamp the log files and cause performance problems itself and so is hardly ever recommend.
Query ...