(Io, a Jupiter's moon) SQL query optimization is challenging for those who have just started working with PostgreSQL. There are many objective reasons for this, such as: the difficulty of the field of system performance in general, lack of good "playground" environments where people can experience how databases work at a larger scale, lack of certain capabilities in Postgres observability tools that are still developing (though, at a good pace), insufficiency of good educational materials. ...| Postgres.AI