(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.
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