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MongoDB profiler output: What is the “command” operation?
The following operations are treated as command operation in MongoDB −
1.count 2.findAndModify 3.aggregate
Following is the example of count in MongoDB −
Let us create a collection with documents −
> db.demo443.insertOne({"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e78d281bbc41e36cc3caeb9") } > db.demo443.insertOne({"Name":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e78d285bbc41e36cc3caeba") } > db.demo443.insertOne({"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e78d288bbc41e36cc3caebb") }
Display all documents from a collection with the help of find() method −
> db.demo443.find();
This will produce the following output −
{ "_id" : ObjectId("5e78d281bbc41e36cc3caeb9"), "Name" : "Chris" } { "_id" : ObjectId("5e78d285bbc41e36cc3caeba"), "Name" : "Bob" } { "_id" : ObjectId("5e78d288bbc41e36cc3caebb"), "Name" : "David" }
The MongoDB count example is as follows −
> db.demo443.count();
This will produce the following output −
3
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