When a Fabric capacity's overage goes beyond the 10-minute throttling window, the excess is pushed into future timepoints and gradually repaid from unused capacity (burndown); throttling lasts until it's gone.
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In the Ultra Transcenders books
Each book explains Carryforward in context, with comparison tables and the common traps.
Terms in this definition
- Fabric capacity
The compute behind Microsoft Fabric, sized in capacity units (CUs). Microsoft recommends F SKUs, purchased via Azure with per-second billing.
- Overage
Fabric capacity consumption, after smoothing, that exceeds what the SKU allows in a timepoint. Any overage left after the 10-minute throttling window carries forward and is paid off by later idle time; alternatively, capacity overage billing at triple the usual rate avoids throttling.
- WINDOW
Returns rows from a sorted, optionally partitioned table, either at fixed positions (ABS) or relative to the current row (REL). Running totals plus moving averages are common uses.
- Capacity
A reserved block of compute for a tenant whose size is fixed by its SKU; Fabric F SKUs express it in capacity units (CUs). Workspaces assigned to it unlock features like Copilot, and from F64 upwards people with free licences can view Power BI content.
- Burndown
The Fabric capacity mechanism whereby spare CUs in later timepoints repay carryforward, the overage that went past the 10-minute window. Throttling stays in place until the carryforward has been fully paid off.