no tenant has access to other tenants’ data. • Providing protection from noisy neighbors, • Being able to restore a tenant’s data with ease • Implementing tenant-specific customizations.
incorporate isolation protection, maintain, update and upgrade, and monitor the health of their application and database schema, and troubleshoot tenant issues.
is confined to the tenant’s database and isolated from other tenants and their data. Shared database - Sharded. Multiple tenants share one of multiple databases. A distinct set of tenants is assigned to each database by using a partitioning strategy such as hash, range, or list partitioning. This data distribution strategy often is referred to as Sharding. Shared database-single. A single, sometimes large, database contains data for all tenants, which are disambiguated in a tenant ID column.
measure of how much tenant isolation a data model achieves. Cloud resource cost. The amount of resource sharing between tenants can optimize cloud resource cost. A resource can be defined as the compute and storage cost. DevOps cost. The ease of application development, deployment, and manageability reduces overall SaaS operation cost. Design Concerns
ownership of their own data favors the pattern of a single database per tenant. Scale. An application that targets hundreds of thousands or millions of tenants favors database sharing approaches such as sharding. Isolation requirements still can pose challenges.
(less than a dollar), isolation requirements become less critical and a shared database makes sense. If per- tenant revenue is a few dollars or more, a database-per-tenant model is more feasible. It might help reduce development costs.
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