SaaS model is taking cloud application business by the storm. Companies are less and less developing in-house solutions and are instead more relying on 3rd party SaaS solutions for larger chunks of their application portfolios, from HR to Finance to Production and procurement. Multi-tenant design is a critical aspect for every SaaS company to increase resource utilisation, cost efficiency and achieve desired margins as, in most cases, databases are the biggest item in their monthly bill. No matter if big or small, finding the right multi-tenancy model at the database layer is a complex subject, and it requires the right trade-off between performance, costs, tenant isolation, security and other critical areas. In this session you will learn some of the most successful design patterns and implementation details that support different requirements and use cases, from few users to millions, and see how these can be applied to your own scenarios.