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When using a MongoDB find operation, all qualifying documents are always returned in their entirety. However, there will likely be occasions when only a small subset of the data is actually required in the workflow.
In Mongo Shell, a find operation can include a field filter, like so:
db.testcollection.find( {}, {"scheduling.scheduling-type": 1 })
From matching documents (in this case, all documents in the collection) this returns only the ObjectID and the contents of the scheduling-type field.
Adding the ability to filter to only required fields should improve performance, as less data needs to be sent; e.g. one full document is ~6,700 characters, but getting only one field cut the return size to ~100 characters, cutting down the data sent by more than 98%. This saving, particularly when multiplied out across very large find sets, would reduce network traffic and memory requirements and should improve performance.
Idea priority | Medium |
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