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pointer to memory as index?
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> 5. [...] incompatible file-format

Isn't that moot, since this thread is about *in-memory* DBs?

I would assume the two formats being different, yet convertible  
to each other, with different optimization goals.

The _hypothetical_ in-memory-optimized format would also have  
no need for backward compatibility, since always transient in nature.  
Could even not be paged at all for example.