Regarding the H2 database is and how to upgrade it - the hold action refers to the documentation with no specific section in the documentation to reference.
The hold action has: For the steps to migrate an H2 product database, see Migrate an H2 Database in the product documentation.
Doing a search on "Migrate an H2 Database" returns:
Release : 14.0
Customer entered the "Migrate an H2 database" search string under View 14.0, but this is documented under "Web Viewer 14.0" and not "View 14.0." When yousearch under Web Viewer 14.0 the appropriate documentation is found - https://techdocs.broadcom.com/us/en/ca-mainframe-software/traditional-management/web-viewer/14-0/installing/migrate-an-h2-database.html