RDB was the built-in database in DEC VAX/VMS. Oracle bought it from them when DEC was selling off its assets, while DEC was busily going broke from the misguided effort to develop the VAX 9000.
DEC was in the process of slowly imploding. The lead OS engineer, Dave Cutler, had already left to go to Microsoft with his team, where he took the skeletal outline "OS/2 3" project to make a portable OS/2, and turned it into OS/2 NT and thence Windows NT.
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RDB was the built-in database in DEC VAX/VMS. Oracle bought it from them when DEC was selling off its assets, while DEC was busily going broke from the misguided effort to develop the VAX 9000.
https://en.wikipedia.org/wiki/Oracle_Rdb
https://en.wikipedia.org/wiki/VAX_9000
DEC was in the process of slowly imploding. The lead OS engineer, Dave Cutler, had already left to go to Microsoft with his team, where he took the skeletal outline "OS/2 3" project to make a portable OS/2, and turned it into OS/2 NT and thence Windows NT.