How can i make MySQL to save its items into certain folder / partition?

Hello,

i think that MySQL is creating some temporary tables on the HDD and some in RAM. I would like to use ramdisk /dev/shm to hold temporary disk tables. How can i tell MySQL to save temporary data there? And is it safe if there is a power outage, it is temporary tale so it should not be big problem if its lost? Is there any tutorial on how to achieve this?

Thx

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