[mabbo]

No, they both matter. The database can handle X shops per partition, and the rails host can handle Y shops per partition.

If rails were half as fast, you'd need twice as many rails hosts (but no more databases).

[phamilton]

> but no more databases

Sort of. Twice as many rails hosts means more DB connections which generally means more load/memory on the DB or more load/memory on the external connection pooler.

It's only a bit of incremental load, but it's easy to overlook how many other systems need to run to make Rails scale.

[brianwawok]

No he’s his examples he’s talking 50 stores over 10 machines vs 50 stores over 5 machines. Both would require the same DB count, but the second would save on server costs for stores.