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Asked: 2026-05-21T07:17:09+00:00

Quoting from the MongoDB docs on Capped Collections : Once the space is fully

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Quoting from the MongoDB docs on Capped Collections:

Once the space is fully utilized,
newly added objects will replace the
oldest objects in the collection.

Is there any way to capture a capped collection’s “dropped” objects before they are overwritten ? What I am interested in doing is implementing a series of rollup collections. eg.

Hourly --> Daily --> Weekly --> Monthly  etc.

so when an object is dropped from the Hourly collections, I want to capture it and aggregate it up to the Daily collection.

Thanks in advance.

//Nicholas

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1 Answer

  1. Editorial Team

    As per the MongoDB developers, you can’t do this:

    http://groups.google.com/group/mongodb-user/browse_thread/thread/aec8d0c85f58d89e/d6701df083eb4679?fwc=1

    What I am interested in doing is implementing a series of rollup collections.

    As alex said, one way to solve this is to use MapReduce. Another way is to have a different collection e.g. per day, for example logs20110414 and have your application manage read/writes to the appropriate collection.

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