[nickpsecurity]

OpenVMS', BeOS', IBM's ISAM's, and Reliant Nitro'sfilesystems were database-like:

http://neilrieck.net/docs/openvms_notes_rms_rdb.html

https://en.m.wikipedia.org/wiki/Be_File_System

https://en.m.wikipedia.org/wiki/ISAM

https://en.m.wikipedia.org/wiki/Datalight#Reliance_Nitro

[vt240]

I installed RDB last week on my hobby I64 machine. Although I had glancing encounters with VMS through work, it has been a lot of fun to explore some of the features of the OS in depth. I remember having a WinNT RDB eons ago too. But it seems to have disappeared from the web. The Internet Archive has a copy of "Rdb : a comprehensive guide" for loan if anyone is interested.