Term Kind Topic What it is
Real-Time Analytics Store OLAP Serving Layer tool Real-Time Analytical Stores A database built for sub-second aggregate queries over freshly ingested data at high concurrency, serving user-facing analytics rather than internal reporting.
Stream Processing Frameworks tool Stream Processing Frameworks Engines that process unbounded data with managed state, windowing and fault tolerance — chosen by state and time semantics rather than by throughput.
Sub-Second Aggregation Store tool Real-Time Analytical Stores A database built to ingest continuously and answer aggregate queries over recent data in milliseconds, occupying the gap between OLTP and the warehouse.