JavaScript mongodb — count() much slower than find()?

Key to your answer is

//count
"totalDocsExamined" : 1643722,

vs

//find
"totalDocsExamined" : 0,

The find query operates entirely on the index and does not read any single document while the count query actually reads every document from the db.

The reason is, your find query uses the lean() option. According to mongoose doc:

Documents returned from queries with the lean option enabled are plain javascript objects, not MongooseDocuments. They have no save method, getters/setters or other Mongoose magic applied.

On top of that, in your lean find query you are only select()ing id and status, which seems to be projected ("transformBy" ...) and so the entire query becomes a covered query and no documents must be read to serve the request.

Answer:1

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