Connect to your embedded H2 database using H2 console
Optionally, you can use the H2 console to connect to your H2 database. The simplest way to access the Console is to double-click the jar file for the H2 database. This file is in the <installation-directory>\confluence\WEB-INF\lib\h2-x.x.x.jar
.
Consolidating to supported external databases
If you are using the H2 database, but your confluence is running in a production environment, you need to plan to integrate your current H2 database into the supported external database as soon as possible.
Want to consolidate to a supported external database:
Select supported platforms to find the supported versions in the external database.
Go to the migrating to another Database page to follow the steps provided, step-by-step execution.
Https://www.cwiki.us/display/CONFLUENCEWIKI/Embedded+H2+Database
Confluence 6 H2 Database connectivity and consolidation