Hi Stephan,
multi tenantcy in ASE can be achieved by creating different databases. Using the "create database ..." command you can create additional databases.
The master database is ASE is always separate; this database can be seen as the HANA SYSTEM DB.
Many things are comparable between ASE and HANA multi tenant concepts like individual backup of each database / tenant.
Details of the ASE and HANA multi tenant database concepts are different like resouce (CPU) binding to a database/tenant. For HA/DR: all HANA tenants must be replicated; ASE databases can choosen individually.
Best regards,
Juergen