You can use relation database but sane implementation is ugly and doesn&#x27;t scale. There is little reason to choose bunch complexity and unpredictable behavior over dedicated queue dependency. Sorry, i don&#x27;t have any good material on the topic. Maybe you can use this to see how RDBMS implementation looks and what are the consequences. <a href="https:&#x2F;&#x2F;brandur.org&#x2F;postgres-queues" rel="nofollow">https:&#x2F;&#x2F;brandur.org&#x2F;postgres-queues</a>