Comment by itchyouch

Not really a database per se, but trading system matching engines can maintain updates in excess of 1M/s. Of course these are small 60 byte messages updating 10-15 bytes of a given order book in something like a RB-tree, so it's not as impressive.

What is impressive I guess is that they can sustain 1M updates/sec at a 99.9th percentile update round-trip of ~10 microseconds or so, with medians at around ~4 microseconds.