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When scaling out mid-query pays

Money cannot move that line. Only reducing the fixed cost can.

Remaining work
core-seconds still to do
Workers
workers before and after
Startup
provisioning, cold caches, no data locality

Trade-off: Isolation vs. utilization

Worked examples, recomputed

Every number the mechanisms quote for this relationship is recomputed from it, so none of them disagrees with it.

Where it appears

Each mechanism states it in its own names. The general symbol each name stands for is shown with it.

  • Execution Engine Runtime

    Once a query plan is chosen, why does the machine still sit idle, and what does each mechanism of a query runtime pay to buy that idle time back?

    Read it in place →