Comment by erikpukinskis

Also worth noting that it’s often not single-node performance that caps throughput… it’s replication.

Databases are pretty good at quickly adding and removing lots of rows. But even if you can keep up with churning through 1000 rows/second, with batching or whatever, you still need to replicate 1000 rows/second do your failover nodes.

That’s the big win for queues over a relational db here: queues have ways to efficiently replicate without copying the entire work queue across instances.