Calculations run on this device. Scenario values are not sent anywhere — the engine is fully local.
system design calculator · free
Query Plan Diff
Diff two plans side by side and find the row-estimate lie.
What changed between yesterday's plan and today's regression?
Engine 1.0.0 · calculation
11000000
11000000
110000000
- Speedup
- ×15.00
- Cost delta
- 11200
- Per-row before
- 0.2400
- Per-row after
- 0.0160
Plan change is a clear win — lock stats / indexes that caused it.
12000 → 800
Method
- Deterministic local model of the mechanism — knobs recompute outputs instantly with no network.
- Numbers are teaching approximations, not production capacity guarantees.