When cold storage pays

Worked examples, recomputed

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

• $0.06 saved over 6 months ÷ $0.03 per read → fewer than 2 full reads
• $0.06 retrieval ÷ $0.0172 saved per month → ≈ 3.5 months

Where it appears

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

• Cost Mechanics

  What is metered, and what is the smallest increment you are charged for?

  $$p(\text{read})\times \text{retrieval cost}<\text{stock saving}$$

  Read it in place →

• Table & Storage Maintenance

  Who pays for the gap between the order data arrives in and the order it is read in: the writer, every reader, or a background job, and what is the break-even?

  $$\text{expected dormancy}>\frac{\text{retrieval fee}}{\text{monthly saving}}$$

  Read it in place →