A couple of jobs ago, I was working somewhere where the big niche app they used was based on an Intersystems Cache DB. Cache is literallyactual commercialized MUMPS. It had a SQL translation layer, but it was still...very weird.
I remember Intersystems Cache ads. I dreamt about how nice it would be to use as I grappled with hand crafted (remember to escape untrusted inputs!!) SQL statements in the “Lower Level Business” layer of a ASP.NET1.0 app. Sounds like it wasn’t such a silver bullet?