SaaS platforms use data sharding to limit breach damage; splitting databases into partitions prevents wholesale user compromise by containing blast radius to single shard instead of entire system.

Sharding to Contain the Blast Radius of Data Breaches – Mimir Security

Modern SaaS platforms sit on top of massive, multi-tenant data stores. When those stores are breached, the damage is rarely limited to a single record; it is often “wholesale” compromise of large slices of the user base. For a CISO or CTO, this is the critical risk: not that a record can be stolen, but that everything a given system knows becomes available in one incident. Introduction: From “All or Nothing” Breaches to Bounded Blast RadiusModern SaaS platforms sit on top of massive, multi-tenan...