Introduction
MongoDB is a cross-platform, document oriented database that provides, high performance, high availability, and easy scalability. MongoDB works on concept of collection and document.
Comparison
Difference between MongoDB and RDMS.
Or Difference between MongoDB and MySQL.
*Concept
| MongoDB |
RDMS |
| Database |
Database |
| Table |
Collection |
| Document |
Row |
| Field |
Column |
| Embedded Document |
Table Join |
| _id |
Primary Key |
*Database Operations
| MongoDB |
RDMS |
| create database test_database; |
use test_database |
| show databases; |
show dbs |
| drop database test_database; |
use test_database; db.dropDatabase() |
*Collection Operations
| MongoDB |
RDMS |
| create table products (…); |
db.createCollection(“products”) |
| alter table testcoll add …; |
Automatically generated |
| show tables; |
show collection |
| drop table products; |
db.drop("products") |
*Document Operations
| MongoDB |
RDMS |
| insert into products values('a','b'); |
db.products.insert({ name : ‘a’ , type : “b” }) |
| select * from products; |
db.products.find() |
| select name from products where name = 'a' order by name; |
db.products.find({ name : 'a' }, { name : 1 }).sort({ name : 1 }) |
| select count(*) from products; |
db.products.count() |
Installation
brew update
brew install mongodb
sudo mkdir /data/db
sudo mkdir /var/log/mongodb
sudo chmod go+w /data/db
