> In addition to vertical partitioning to move database tables, we also use horizontal partitioning (aka sharding). This allows us to split database tables acro

> In addition to vertical partitioning to move database tables, we also use horizontal partitioning (aka sharding). This allows us to split database tables across multiple clusters, enabling more sustainable growth. We’ll detail the tooling, linters, and Rails improvements related to this in a future blog post. They make a clear distinction between "vertical partitioning" and "horizontal partitioning", I think there are probably bigger wins to be had, and probably bigger challenges in the horizontal partitioning than the vertical. All of this work only got them a 2 factor reduction in load, whereas with an ideal horizontal solution, they could scale it infinitely.