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Fitting all keys in memory is a pretty harsh constraint though. With your 64byte to 1.5k you are talking about a factor of 20, so for a 1TB SSD you need 64GB RAM, which costs about as much as the SSD.



"so for a 1TB SSD you need 64GB RAM, which costs about as much as the SSD."

In my experience this is not true. A 1 TB SSD, even commodity hardware, is pretty expensive. And that's not even talking about high performance SSD's like Fusion IO, where you're now talking about 10K+. Where do you see 64 GB of RAM costing that much?

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Micron unveils 1TB SSD for $600, which is about what 4x16GB ECC RAM is...

https://www.computerworld.com/s/article/9235277/Micron_unvei...

Fusion IO is probably as expensive as RAM, so only makes sense for apps that really need persistence, ie databases.

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