Every index you add uses a whole lot more disk space (a big deal) and slows down writes (usually not a big deal). The idea of a tool automatically adding index

Every index you add uses a whole lot more disk space (a big deal) and slows down writes (usually not a big deal). The idea of a tool automatically adding indexes scares me a little. Sometimes you specifically want a query to take 0.003s instead of 0.001 because you don't want to use another 10GB of disk space.