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BeOS had a database-based filesystem way back in the early 1990s.

It was slow and difficult to keep up to date. They swapped it out with BFS and the rest was history.

It's possible this will do better than Be's old database system, but this is not a novel idea.

In the article he says that DBs are now much faster.

People are also much happier these days to introduce a factor of 10 slowdown relative to what the hardware can natively support.

IBM big iron systems still use databases as file system.