Capped Collections - MongoDB Manual v8.0

Capped collections are fixed-size collections that insert and retrieve documents based on insertion order. Capped collections work similarly to circular buffers: once a collection fills its allocated space, it makes room for new documents by overwriting the oldest documents in the collection. Restrictions Capped collections cannot be sharded. You cannot create capped collections on serverless inst

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固定サイズ auto-FIFO