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You don’t even need a ram disk imho, databases already cache everything in memory and only writes reach the disk.

Just try and cold-start your database and run a fairly large select twice.

Also the OS will cache a lot of the reads even if your database isn’t sophisticated enough or tuned correctly. Still could be a fun exercise, as with all things on here.

Any half decent DBMS bypasses the page cache, except for LMDB.

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