Transaction in different DB

Hi all
I have to develop an embedded database using memory FLASH and memory RAM
Some tables must be saved in RAM and some tables in FLASH ( RAM and FLASH
are two different mounted directories in the file system).
I saw it's possible to save different databases in different directories
with CREATE DATABASE options.

It's possible to save only some tables in different directories??

If I want to work with two different databases, it's possible to do  a single
transaction on two different databases ??

Thanks

Stefano Farina

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