You certainly can use a db for an event source. This article does a really good job of explaining how: <a href="http:&#x2F;&#x2F;www.confluent.io&#x2F;blog&#x2F;turning-the-database-inside-out-with-apache-samza&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.confluent.io&#x2F;blog&#x2F;turning-the-database-inside-out...</a><p>As mentioned in the post, we&#x27;ve pushed Kafka to at least 700,000 events per second. We have room to push it to much more, but stay in tune for post 2 and 3 to see what we&#x27;re doing instead.