Subchapter 62.6

Commitment Pricing Worked Examples

references/commitment-pricing-worked-examples.mdMarkdown6 KBView on GitHub

Worked Examples

Back to instructions.md. Pricing rules and tables are in mechanics.md.

Commitment Pricing Worked Examples · Amazon Aurora PostgreSQL · aws/agent-toolkit-for-aws · Skills Docs

Announce reference: “Loading references/commitment-pricing-instructions.md for the commitment-pricing workflow.”
Critical fact first: Reserved Instances do NOT apply to Aurora serverless. Only DSP applies, and only 1-year DSP (no 3-year DSP for Aurora).

Print the script command:

python3 scripts/commitment_pricing_analyzer.py offline \
  --serverless --avg-acu 6 --region us-east-1

Compute inline:
- On-demand: 6 × $0.12 × 730 = $526/mo compute.
- 1-year DSP No Upfront — DSP’s only payment option (serverless reaches up to ~35% off; actual rate varies by usage type per the DSP pricing page): at the 35% serverless ceiling, $526 × 0.65 ≈ $342/mo, saving **$184/mo, ~35%**. There is no Partial/All Upfront DSP.
Size-warning: DSP charges the committed $/hr continuously, including during auto-pause. Your “6 ACU average” should be interpreted as steady baseline — if actual usage drops to 0 ACU for long stretches (overnight, weekends), the commitment is wasted on paused hours. Consider committing to the steady-baseline ACU (probably closer to 2–3 if your workload auto-pauses), and let peaks run on-demand.
Recommendation: 1-year DSP No Upfront at 2 ACU baseline if the cluster auto-pauses, or 1-year DSP No Upfront at 6 ACU if it runs steady 24/7 (No Upfront is DSP’s only payment option). Don’t over-commit.

Print the script command even though we’ll compute inline:

python3 scripts/commitment_pricing_analyzer.py offline \
  --instance db.r6g.xlarge --num-instances 4 --region us-east-1

Critical fact first: DSP does NOT cover db.r6g. Per the coverage table above, r6g is DSP-ineligible. RI is the only commitment option for this family today.
Compute inline — on-demand: 4 × $0.58 × 730 = $1,694/mo.
- 1-year RI All Upfront (~30%): $1,694 × 0.70 = $1,186/mo. Upfront ≈ $14,222. Saves $508/mo, ~30%.
- 3-year RI All Upfront (~55%): $1,694 × 0.45 = $762/mo. Upfront ≈ $27,432. Saves $932/mo, ~55%.
Migration recommendation: if you’re willing to migrate to db.r7g.xlarge (roughly 10% more expensive on-demand — ~$467/mo each vs $423 — but ~15% more performant, and DSP-eligible), DSP unlocks size-flex so you could reshape without losing the commit. That flexibility is typically worth ~5–10% on a 1–3 year horizon for fleets that change over time.
Recommendation: if the fleet is stable and will stay on r6g, 3-year RI All Upfront for the largest savings (55%). If the fleet composition might change within 1-3 years, migrate to r7g first and then take a 1-year DSP. Do not wait for DSP on r6g — it is not on the roadmap.

Announce reference: “Loading references/commitment-pricing-instructions.md — this is the commitment-pricing workflow.” Naming the path makes the routing decision explicit to the user.

Print the script command:

python3 scripts/commitment_pricing_analyzer.py offline \
  --instance db.r7g.2xlarge --num-instances 2 --region us-west-2

Compute inline (us-west-2 ≈ 1.15× us-east-1):
- On-demand: 2 × $1.28 × 1.15 × 730 = $2,149/mo.
- 1-year RI All Upfront (~30%): $1,504/mo — saves $645/mo, ~30%.
- 3-year RI All Upfront (~55%): $967/mo — saves $1,182/mo, ~55%.
- 1-year DSP No Upfront — DSP’s only payment option (provisioned ceiling up to ~20%): $2,149 × 0.80 ≈ $1,719/mo — saves ~$430/mo, ~20%; smaller per-unit discount than the RI options here, but with size-flex (can reshape between r7g/r8g/serverless within commit).
Because the user said “running 24/7” on db.r7g.2xlarge (a DSP-eligible family), both RI and DSP apply. Recommend 1-year DSP No Upfront if the fleet may reshape (size-flex is worth the lower discount), or 3-year RI All Upfront if the fleet is stable and a 3-year lock is acceptable.