Version v0.38 of Metabase is no longer supported. Check out the docs for the current stable version, Metabase v0.63.
What’s H2?
H2 is the underlying application database that’s packaged with Metabase. H2 is a lightweight, in-memory database: perfect for getting spun up quickly, not so perfect for long-term usage. We recommend that you migrate away from H2 for production instances of Metabase.
Read docs for other versions of Metabase.