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No but it does have the concept of tablespaces. If you want you can map RAM to a disk location, set that up as a tablespace, then tell postgres to use that tablespace for your given table. Also set the table as UNLOGGED while you're at it.

A bit more work yes that could be simplified, but fully supported if you control the stack.

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Yes. Putting a Postgres tablespace on a RAM disk (tmpfs) does wonders. Even if NVMe may be comparable to RAM by bandwidth, whatever Postgres has to do to ensure that data are written to the durable store as a part of a commit is still significantly slower compared to RAM.

Highly recommended for running tests, especially in CI/CD pipelines. Doing this simple change can speed up DB-heavy tests 30-50%.

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