H2 has quite heavy use in production too. For example Apache Ignite uses it as the core of it's distributed SQL engine. Ignite takes a distributed SQL query and

H2 has quite heavy use in production too. For example Apache Ignite uses it as the core of it's distributed SQL engine. Ignite takes a distributed SQL query and splits it up into single node queries, which are executed on each node by H2, and then Ignite merges the results back.