Which of the following about Capped Collections is correct?

Question

Options

• AFixed Size
• BOnly "Fixed Size" and "High-throughput operations that insert and retrieve documents based on
• CHigh-throughput operations that insert and retrieve documents based on insertion order
• DIf the allocated space for a capped collection exceeds, it stops inserting new documents

• A
  3% (1)
• B
  94% (34)
• C
  3% (1)

Explanation

Option B is correct because Capped Collections in MongoDB are defined by two core characteristics working together: they have a fixed size (a maximum byte allocation set at creation), AND they support high-throughput insert/retrieve operations that maintain insertion order using a natural circular buffer mechanism. Options A and C are each individually true but incomplete on their own - neither alone fully describes a Capped Collection, making B the only answer that captures the full definition. Option D is wrong because when a capped collection reaches its size limit, MongoDB does not stop inserting - instead it automatically overwrites the oldest documents in a circular fashion, which is the key behavioral distinction.

Memory tip: Think of a capped collection like a fixed-length circular tape recorder - it never runs out of space by recording over the oldest content, and it plays back in the exact order things were recorded. "Fixed size + insertion order" are inseparable partners.

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