MongoDB C# driver 2.0 InsertManyAsync vs BulkWriteAsync

Question

I have to insert many documents in a MongoDB collection, using the new C# 2.0 driver. Is using either collection.InsertManyAsync(...) or collection.BulkWriteAsync(...) making any difference? (particularly about performance).

From what I understand from MongoDB documentation, an insert with an array of documents should be a bulk operation under the hood. Is that correct?

Thanks for your help.

Not sure about the answer but this might help: by MongoDB API description BulkWriteAsync - Performs multiple write operations. InsertManyAsync - Inserts many documents. — Ofir
– Ofir, Commented Oct 3, 2015 at 10:35
If all you are doing is "insert" operations then there is effectively no difference. The point of difference is "BulkWrite" effectively allows mixed operations such as "insert", "update" and "remove" in the same batch. Please note that "under the hood", both are using the same Bulk Operations mechanism anyway. So your interpretation is correct. — Blakes Seven
– Blakes Seven, Commented Oct 3, 2015 at 10:38

Manuel Jordan · Accepted Answer · 2021-05-12 21:54:44Z

25

I found the answer looking at the driver source code: the InsertManyAsync uses internally the BulkWriteAsync.

So using InsertManyAsync it's the same as writing:

List<BsonDocument> documents = ...

collection.BulkWriteAsync(documents.Select(d => new InsertOneModel<BsonDocument>(d)));

Obviously, if all operations are Inserts, the InsertManyAsync should be used.

edited May 12, 2021 at 21:54

Manuel Jordan

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answered Oct 3, 2015 at 10:57

Stefano Castriotta

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