[Kiro]

> the I/O bottleneck in the database

I thought most MMOs kept everything in memory and only offloaded to the database periodically. I clearly remember rollbacks to fix times (XX:00) when things went down.

Edit: Sorry, should have read the whole article before commenting.

[izend]

Exactly, there is no way the state can be persisted on absolutely every change. It has to be periodically dumped to the database.