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Yes, and an important limitation stems from this as well.

For a tool like Redis, it's fairly easy for me to accept the limitation that my data size can't exceed available RAM.

But for an indexed document store with full-text query capabilities, it's a lot harder to for me to accept that limitation.

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Are you implying that a performant Mongo DB must keep all data in RAM? That's not true. We've got almost 1TB in a Mongo DB, and we sure don't have that much RAM.

You do have to be able to keep your indexes in RAM, but that's much less limiting.

Not 1:1, no - thanks for clarifying that. But depending on the content and the indexing, there is a strong correlation between the size of the database and the memory requirements under Mongo DB.

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