You may find this article helpful: <a href="http:&#x2F;&#x2F;rethinkdb.com&#x2F;docs&#x2F;memory-usage&#x2F;" rel="nofollow">http:&#x2F;&#x2F;rethinkdb.com&#x2F;docs&#x2F;memory-usage&#x2F;</a><p>The article describes how RethinkDB uses memory to reduce disk access and process queries, as well as how to reduce its memory usage with `--cache-size`.