The big issue, is SQL Server the only production ready database supported? SQL Server is not a viable option in the open source world. There is an Alpha version

The big issue, is SQL Server the only production ready database supported? SQL Server is not a viable option in the open source world. There is an Alpha version of the PostgreSQL npgsql driver, not sure how solid it is. Moreover, is CoreCLR production ready on Linux? I haven't read 3rd party critical reviews or comparisons against JVM/Go/node.js on Linux. I don't have fond memories of putting faith in Mono/XSP.