![Trending Articles on Technical and Non Technical topics](/images/trending_categories.jpeg)
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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" ] }
Advertisements