Term Kind Topic What it is
Data Virtualisation Query Federation, Logical Data Warehouse pattern Data Virtualisation Querying data where it lives across multiple systems through a single logical layer, without physically consolidating it.
Query Federation pattern Data Virtualisation Executing a single query across several underlying systems without moving the data, and the performance ceiling that pushdown determines.
Source Load Budget Upstream Read Quota, Analytical Load Cap pattern Data Virtualisation An explicit cap on the concurrency, rows and duration that analytical reads may consume on an operational source - so a dashboard query cannot become a production incident.