MongoDB large collection and slow search? How to fix?

For faster search, create index. For this, use createIndex(). Let us create a collection with documents −

> db.demo661.createIndex({ListOfName:1}); {    "createdCollectionAutomatically" : true,    "numIndexesBefore" : 1,    "numIndexesAfter" : 2,    "ok" : 1 } > db.demo661.insertOne({_id:1,ListOfName:["John","Robert","David"]}); { "acknowledged" : true, "insertedId" : 1 } > db.demo661.insertOne({_id:2,ListOfName:["Mike","Sam"]}); { "acknowledged" : true, "insertedId" : 2 } > db.demo661.insertOne({_id:3,ListOfName:["John","David","Bob"]}); { "acknowledged" : true, "insertedId" : 3 }

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

> db.demo661.find();

This will produce the following output −

{ "_id" : 1, "ListOfName" : [ "John", "Robert", "David" ] } { "_id" : 2, "ListOfName" : [ "Mike", "Sam" ] } { "_id" : 3, "ListOfName" : [ "John", "David", "Bob" ] }

Following is the query to fetch documents −

> db.demo661.find({"ListOfName": {"$all":["John","David"]}});

This will produce the following output −

{ "_id" : 1, "ListOfName" : [ "John", "Robert", "David" ] } { "_id" : 3, "ListOfName" : [ "John", "David", "Bob" ] }