The Easy Franchise application does not store a large amount of data, nor are the SQL statements long-running or frequently-executed.
Your scenario might differ here.
In case you would like to measure the used memory the monitoring view M_CS_TABLES which provides runtime data for a column table might help. The disadvantage is that this monitoring view only provides values for a timestamp. If your amount of data differs over the time, you should consider counting the Create/Update/Read/Delete operations.
In case your application produces big workload, you can use Workload Classes to restrict the workload. To learn more, see Managing Workload with Workload Classes at SAP Help Portal.