I just learned about rake db:system:change task that Rails provides, to speed up switching between different database engines. If you’re experimenting with something, or benchmarking things, this is super useful.

I had a simple PostgreSQL app and running rake db:system:change --to=sqlite3 and afterwards rake db:setup got me going with my task in seconds.

Small detail I noticed, rake -T which should list all available tasks, does not show anything about db:system for some reason.