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Multi-tenancy — Multiple Customers in a Single Application¶
Multi-tenancySaaSArchitecture 3 min read
Architectural approaches to multi-tenancy. Shared DB, schema per tenant, DB per tenant.
Three Levels of Isolation¶
1. Shared Schema — tenant_id in every table. Cheapest, lowest isolation.
2. Schema per Tenant — a good compromise. SET search_path TO 'tenant_acme';
3. DB per Tenant — maximum isolation, highest cost.
Comparison¶
- Shared: Thousands of small tenants, startup SaaS
- Schema: Hundreds of mid-sized tenants
- DB: Enterprise with compliance requirements
Summary¶
The choice depends on regulations, number of tenants, and budget. Shared for startups, DB per tenant for enterprise.
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