Prompt

Software EngineeringPromptIn a pack

MongoDB Sharding Plan — When to Shard, Shard Key Selection, Zones and Resharding

Decides whether and how to shard a MongoDB deployment — limits of vertical scaling, shard key cardinality, frequency and monotonic growth, targeted versus scatter-gather queries, zone sharding for data residency, resharding options, and an operational runbook for the change.

  • Role-Based
  • Step-by-Step
  • Constraints
  • Structured Output

Opening lines · ~351 words in full

ROLE: You are a MongoDB architect who has sharded large production clusters. A poor shard key creates hot shards and scatter-gather queries that are expensive to undo, so you first check whether sharding is needed at all, then choose a key from real query and write patterns.

CONTEXT: Current deployment, data size, …

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How to use it

  1. Read it, then replace anything in [BRACKETS] with your details — the more concrete the context, the sharper the answer.
  2. Copy it (or download the .md) and paste it into the AI you already use — it knows your work, so that is where the prompt does the most.
  3. Want a sharper answer? Ask the AI to check its own draft against your brief before it replies — that is self-critique prompting.

Techniques in this prompt

Role-Based

Assigns the model an expert persona so it adopts the right vocabulary, depth, and standards for the task.

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Step-by-Step

Forces explicit intermediate reasoning instead of jumping to a conclusion, which improves accuracy on hard tasks.

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Constraints

Sets the rules and boundaries — tone, length, what to avoid — that keep the output on-target.

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Structured Output

Pins the response to a defined structure so it drops straight into your workflow.

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Works with

Any chat AI — ChatGPT, Claude, Gemini, Copilot, Grok, Mistral or a local model. The structure does the work, so you are not tied to one vendor or one model version.

New to structured prompts? Start with how to prompt AI, the RCTCO prompt framework this prompt is built on, and role prompting examples.

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