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THE FEUTEX TOOLKIT

Index Key Footprint

Estimate fixed index payload including key, row pointer and fill factor.

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FormulaEstimated leaf payload allocation = rows*(key+ptr)/(fill/100)/1e9

Made for real tasks

  • Estimate fixed index payload including key, row pointer and fill factor.
Explore step-by-step workflows →

Worked example

Inputs

Indexed rows
10000000 rows
Key width
24 bytes
Row locator width
8 bytes
Leaf fill factor
80 %

Expected results

Estimated leaf payload allocation
0.4 GB

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter indexed rows, key width, row locator width, leaf fill factor in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "rows": 10000000,
  "key": 24,
  "ptr": 8,
  "fill": 80
}

Accuracy and scope

Leaf payload estimate only; tuple headers, tree parents and database encoding excluded.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.