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Unify best practices for countDocuments() and estimatedDocumentCount()

See original GitHub issue

Re: discussion from https://github.com/Automattic/mongoose/issues/6713, leaving a note to think about whether we should add a method that switches between countDocuments() and estimatedDocumentCount() based on whether filter is empty or not.

Issue Analytics

State:
Created 5 years ago
Reactions:8
Comments:6

Top GitHub Comments

7reactions

vkarpov15commented, Sep 30, 2018

There’s some more detail about why you would use one vs the other in the API docs:

TLDR; estimatedDocumentCount() is faster when you’re looking to count how many documents are in the entire collection, but might not be 100% accurate in a sharded cluster. If you’re using a standalone MongoDB instance and have less than 100k documents per collection, it doesn’t make much difference whether you use estimatedDocumentCount() or countDocuments(). It can make a big difference with large collections though.

0reactions

shuwenhecommented, Aug 19, 2019

CountDocuments

Top Results From Across the Web

db.collection.countDocuments() — MongoDB Manual

Count all Documents that Match a Query¶ · db.collection.estimatedDocumentCount() · $group and $sum · count · collStats pipeline stage with the count option....

MongoDB count() versus countDocuments() - Stack Overflow

The db.collection.find method returns a cursor. The cursor.count() method on the cursor counts the number of documents referenced by a ...

Mongoose v6.8.2: API docs

Mongoose.prototype.connect(). Parameters. uri «String» mongodb URI to connect to. [options] «Object» passed down ...

Collection - Node.js MongoDB Driver API

new Collection(){Collection} ... Deprecated. use countDocuments or estimatedDocumentCount instead ... countDocuments(query, options, callback){Promise}.

Collection level operations — PyMongo 4.3.3 documentation

coll1.read_preference Primary() >>> from pymongo import ReadPreference ... when $out or $merge are used on MongoDB <5.0, in which case PRIMARY is used....