Introduction
Multi-tenancy is fundamental to SaaS. It allows you to serve multiple customers from a single application instance while keeping their data isolated.
Tenancy Models
#
1. Database per Tenant
Each tenant has their own database. Maximum isolation but complex management.#
2. Schema per Tenant
Shared database, separate schemas. Good balance of isolation and efficiency.#
3. Shared Schema
All tenants in the same tables with tenant_id columns. Most efficient but requires careful design.Implementation Strategies
#
Row-Level Security
``sql
CREATE POLICY tenant_isolation ON orders
USING (tenant_id = current_setting('app.tenant_id')::uuid);
`#
Middleware Approach
javascript
app.use((req, res, next) => {
req.tenantId = extractTenantFromRequest(req);
next();
});
``Conclusion
Choose your multi-tenancy strategy based on your security requirements, scale expectations, and operational capabilities. There's no one-size-fits-all solution.
