What Is Multi-Tenancy in SaaS Applications
Blog post from Ory
Multi-tenancy enables a single SaaS application to serve multiple customer organizations through shared code and infrastructure while logically separating each tenant’s users, data, and settings with a Tenant ID. Compared with dedicated single-tenant deployments, it reduces costs, simplifies maintenance, supports rapid onboarding, and scales pooled capacity efficiently, but it makes strong access control essential because an omitted tenant filter or authorization flaw can expose data across customers. Organizations can select silo, pooled, or hybrid isolation models, and database designs range from shared tables with tenant identifiers to separate schemas or dedicated databases, balancing cost, management overhead, security, and compliance requirements. Key operational challenges include noisy-neighbor performance, data residency rules, and limited deep customization, which can be addressed through quotas, geographic partitioning, tiered infrastructure, configuration options, and feature flags. The account emphasizes identity and access management as the critical enforcement layer, requiring tenant-aware authentication, single sign-on options, fine-grained tenant-scoped permissions, and self-service administration; it presents Ory’s Kratos, Hydra, and Keto products as tools for authentication, OAuth and OpenID Connect, and relationship-based authorization in multi-tenant B2B applications.
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