Disk Usage MySQL no space

Hello, In disk space usage i see that mysql is using 4 GB the blue color is full. I tried to run command: # /usr/local/cpanel/scripts/update_db_cache
But the same problem how the blue color is full with only 4GB? :eek: or simply how can I increase the space? My server information: Processor 2x X5650 @ 2.67GHz Ram 72 GiB Disk 120 GB 3 TB I also tried a SQL in phpMyAdmin, cannot see the free space 0.00000000 Best regards :)