What is Tenant Isolation?
Tenant Isolation is defined as the security strategy in multi-tenant software that ensures one tenant can never access, modify, or view the data of another tenant.
Detailed Architectural Context
Tenant isolation is the primary security requirement for B2B SaaS applications. It can be implemented at the database level using separate databases per tenant (physical isolation), separate database schemas (logical isolation), or shared tables with tenant ID columns secured by Row-Level Security (RLS). Ensuring absolute isolation prevents catastrophic data leakage incidents and guarantees compliance with industry security frameworks like ISO 27001.
Related Technical Terms
Multi-Tenancy
A software architecture where a single instance of an application runs on a server and serves multiple distinct client organizations, called tenants.
SaaS (Software as a Service)
A cloud-based software licensing model where applications are hosted by a provider and accessed by users over the internet, typically via subscription.
Row-Level Security (RLS)
A database-level security policy that controls access to specific rows in a database table based on the characteristics of the user executing a query.
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