MongoDB many inserts\updates without affecting performance?

Use insertMany() to insert multiple documents into a collection. With that, to update performance you can use ensureIndex().

Let us create a collection with documents and insert multiple documents −

> db.demo325.insertMany( [
...    { _id: 101, Name: "Chris", Age: 23 },
...    { _id: 102, Name: "David", Age: 24 },
...    { _id: 103, Name: "Bob", Age: 22 }
... ] );
{ "acknowledged" : true, "insertedIds" : [ 101, 102, 103 ] }

Display all documents from a collection with the help of find() method −

> db.demo325.find().pretty();

This will produce the following output −

{ "_id" : 101, "Name" : "Chris", "Age" : 23 }
{ "_id" : 102, "Name" : "David", "Age" : 24 }
{ "_id" : 103, "Name" : "Bob", "Age" : 22 }

Using ensureIndex() −

> db.demo325.ensureIndex({Name:1});

This will produce the following output −

{
   "createdCollectionAutomatically" : false,
   "numIndexesBefore" : 1,
   "numIndexesAfter" : 2,
   "ok" : 1
}