Resizing a Cloud SQL Instance
Cloud SQL Instances can be resized at any time by changing the Database Type – which defines the amounts of RAM, CPU and local SSD storage allocated to an instance.
Changing Database Type
From the Cloud SQL instance view, click the Resize
button from the “Size”
details section:

Choose a new type and click Save
:

Restarting the instance
Following a successful resize the increased vCPU and local SSD allocations are usable straightaway, but the instance will need to be restarted to pick up the new RAM allocation.
The confirmation dialog gives you the option to Restart Now
or to click
Cancel
if you plan to restart later at a more convenient time.

Depending on how busy the database is, there may be a brief interruption while
the underlying database engine service is restarted – so for production databases
you may wish to restart later by clicking Restart
from the instance view.