Multi-Tenancy
An architecture where one application instance serves many customer organisations, with strong logical (and sometimes physical) isolation of their data.
Multi-tenant SaaS isolates customer data either via (a) shared schema with `tenant_id` on every row + Postgres Row-Level Security, (b) schema-per-tenant, or (c) database-per-tenant. RLS + shared schema is the 2026 default — operationally simple, cheap, and audit-friendly. Cross-tenant queries must be impossible by construction, not by application logic.
Related terms
A subscription-billed software product sold to businesses (not consumers), typically multi-tenant, with org-level auth, role-based access, and per-seat or usage-based pricing.
The world's most advanced open-source relational database — first choice for B2B SaaS, AI/vector workloads (with pgvector), and anything that needs strong consistency.
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