Yes, that would be one way. Another is to check how much memory MySQL is allowed to use.
The first thing you could check is to see whether you have swap space allocated. The quickest way is to run the free command. On my home computer it shows 16 GB of RAM, 10 GB of swap:
free
total used free shared buff/cache available
Mem: 16186984 4342812 6643316 590836 5200856 10905008
Swap: 10485752 456192 10029560
The easiest way to check is via diagnosis on the Yunohost admin page:
If you have no swap space, the easiest is to create a swap file. You can do it like this for a swap file of half a GB:
fallocate -l 512M /swapfile && chmod 600 /swapfile && mkswap /swapfile && swapon /swapfile
It will give you an idea how much RAM you would need extra to cover your needs. Keep in mind that swap on disk is much slower than RAM.
Add it to /etc/fstab to have it mounted automatically on boot.