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.