SaaS architecture: single-tenant vs multi-tenant
A deep technical comparison of tenancy models and their implications for security and scalability.
Deep Dive into Tenancy
We analyze the database-per-tenant vs schema-per-tenant models and when to use each for maximum performance in your SaaS application.
Single-Tenant Architecture
Each customer gets their own database instance. Pros: Complete isolation, easier compliance, no noisy neighbor problems. Cons: Higher infrastructure costs, operational complexity at scale.
Multi-Tenant Architecture
Multiple customers share database and application resources. Pros: Lower costs, easier maintenance, built-in scalability. Cons: Security complexity, performance isolation challenges.
Database-per-Tenant Model
Each tenant has their own database. Highest isolation, highest cost. Best for enterprise customers requiring data isolation guarantees.
Schema-per-Tenant Model
Tenants share a database but have separate schemas. Good balance of isolation and cost. Best for mid-market SaaS with 100 to 10,000 tenants.
Row-Level Security
Tenants share tables with row-level filtering. Lowest cost, requires careful application logic. Best for high-volume SMB SaaS.
How to Choose
Start with schema-per-tenant and upgrade to database-per-tenant only when customer requirements demand it. RLS is viable for most early-stage SaaS products.
Migration Considerations
If starting single-tenant, plan for future migration. Design with abstraction from day one. Consider tenant migration tools.
Sapterc Editorial Team
Expert insights on SaaS architecture, product management, and engineering.