Fabric RTI 101: Applying Temporal Windows

One of the challenges with streaming data is that it never ends — it just keeps flowing. If we tried to calculate totals or averages across the entire stream, the numbers would just keep growing forever, and we’d never get a meaningful result. That’s why we use temporal windows.

A temporal window lets us break the continuous stream into slices of time, so we can apply aggregations within those boundaries. For example, instead of calculating total transactions forever, we might calculate total transactions every minute, or average sensor readings every five seconds. Each window produces a result that can be stored, visualized, or acted upon in real time.

Currently, these temporal options are supported in the Group By and the Custom SQL operations.

There are several windowing strategies, and each one is designed for different business needs. Tumbling windows divide time into fixed, non-overlapping slices — great for reporting metrics per minute or per hour. Sliding windows move forward in small steps, overlapping slightly, which makes them useful for spotting trends or detecting spikes. Session windows group events into sessions of activity separated by idle gaps, which is very useful in customer behavior analysis. And hopping windows combine the advantages of overlapping and fixed intervals to detect patterns at multiple granularities.

Windows turn an infinite, continuous stream into manageable chunks that we can analyze. They give us control over how aggregations are applied, and they allow business users to see insights in a way that makes sense — whether that’s every few seconds for system monitoring, every few minutes for operational dashboards, or every hour for business reporting.

Without windows, streaming analytics would feel overwhelming — just a firehose of data. With windows, we can organize that firehose into buckets, making it possible to compute meaningful metrics, detect anomalies, and power real-time decisions.

Learn more about Fabric RTI

If you really want to learn about RTI right now, we have an online on-demand course that you can enrol in, right now. You’ll find it at Mastering Microsoft Fabric Real-Time Intelligence

2026-04-11