> For the complete documentation index, see [llms.txt](https://gchandra.gitbook.io/data-warehousing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gchandra.gitbook.io/data-warehousing/data-warehousing-concepts/types-of-facts/periodic-fact.md).

# Periodic Fact

Stores current state at regular intervals.

Explain the state of entities at a particular instance in time.

The time interval can be hourly/daily/weekly.

Use Case:

```
Analyze business performance at a fixed interval.
Status of all flights. 
Inventory stock. How much stock is left at the end of the day?
```

Transaction Fact Table is the source, and this stores a snapshot of info.

GRAIN for this table will be hourly / 2 hrs / daily based on need.