The document discusses Software as a Service (SaaS) and its tenancy models, emphasizing the differences between single-tenancy and multi-tenancy. It provides criteria for selecting an appropriate tenancy model based on scalability, tenant isolation, cost, operational complexity, and customizability, along with examples of SaaS design patterns. The content serves as a guide for understanding SaaS concepts and making informed decisions in model selection.

1. Microsoft: Multi-
tenant SaaS with
Azure
By: Akash Kumar Jadav
WWW.AIMDEK.COM

2. Agenda
• SaaS concepts and terminology
• How to choose the appropriate tenancy model
• SaaS Design Patterns
• Standalone app
• Database-per-tenant
• Sharded multi-tenant
• Tenancy models compared
• Demo

3. SaaS concepts and terminology
In the Software as a Service (SaaS) model, your company does not sell licenses to your software.
Instead, each customer makes rent payments to your company, making each customer a tenant
of your company.
In return for paying rent, each tenant receives access to your SaaS application components, and
has its data stored in the SaaS system.
The term tenancy model refers to how tenant’s stored data is organized:
• Single-tenancy: Each database stores data from only one tenant.
• Multi-tenancy: Each database stores data from multiple separate tenants (with
mechanisms to protect data privacy).
• Hybrid tenancy models are also available.

4. How to choose the appropriate tenancy model
● Scalability:
○ Number of tenants.
○ Storage per-tenant.
○ Storage in aggregate.
○ Workload.
● Tenant Isolation: Data isolation
and performance (whether one
tenant's workload impacts others).
● Per-tenant cost: Database costs.
● Development complexity:
○ Changes to schema.
○ Changes to queries (required
by the pattern).
● Operational complexity:
○ Monitoring and managing
performance.
○ Schema management.
○ Restoring a tenant.
○ Disaster recovery.
● Customizability: Ease of
supporting schema customizations
that are either tenant-specific or
tenant class-specific.

5. SaaS Design Patterns
• Standalone single-tenant app with single-tenant
database
• Multi-tenant app with database-per-tenant
• Multi-tenant app with multi-tenant databases
• Multi-tenant app with a single multi-tenant
database
• Multi-tenant app with sharded multi-tenant
databases
• Hybrid sharded multi-tenant database model

6. Tenancy Patterns

7. Tenancy Models Compared

8. Questions and Answers

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