Memory Limit reached causes mariadb server restart

The configuration looks like this:

systemctl edit mariadb.service

add the following for example

systemctl edit mariadb.service

[Service]

MemoryMax=18000M

MemorySwapMax=750M

systemctl daemon-reload

or vi(m) / nano

nano /etc/systemd/system/mariadb.service.d/override.conf

If the memory limit is reached, the server crashes and restarts.

This memory limit behaves as if there was no more memory available on the system.

Could memory drain intelligence be improved?