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Asked: 2026-05-23T09:04:42+00:00

Assuming I insert the following records (e.g. foo1, foo2, foo3, foo4, …. foo10) I

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Assuming I insert the following records (e.g. foo1, foo2, foo3, foo4, …. foo10)
I would like the collection to retain only 5 records at any point in time (e.g. it could be foo1, … foo5 OR foo2, … foo6 or foo6, … foo10)

How should I achieve this?

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1 Answer

  1. Editorial Team

    Sounds like you’re looking for a capped collection:

    Capped collections are fixed sized collections…
    […]
    Once the space is fully utilized, newly added objects will replace the oldest objects in the collection.

    You can achieve this using a command similar to 

    db.createCollection("collectionName",{capped:true,size:10000,max:5})

    where 10000 is the size in bytes and 5 is the maximum number of documents you would restrict in the collection.

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