Version v0.40 of Metabase is no longer supported. Check out the docs for the current stable version, Metabase v0.63.
H2 is a lightweight, in-memory database; it’s perfect for getting spun up quickly, but not so good for long-term usage. By default, Metabase uses H2 to store its internal data. If you want to run Metabase in production, we recommend that you migrate off H2.
