Introduction to NoSQL (vii)

Introduction to NoSQL (vii)

MongoDB Introduction

• Official website www.mongodb.com
• C + +, based on distributed, belongs to a NoSQL
• In NoSQL, it's the most like relational database.
• MongoDB stores data as a document, and data structures are composed of key-value (key=>value) pairs. A MongoDB document is similar to a JSON object. Field values can contain other documents, arrays, and document arrays.
• Because it's distributed, it's easy to scale

Comparison of MongoDB and relational databases

SQL Terminology Concepts	MongoDB Terminology Concepts	Explanatory notes
Database	Database	Database
Table	Collection	Database Tables/Collections
Row	Document	Data record lines/documents
Column	Filed	Data fields/Fields
Index	Index	Index
Table joins		Table Connection MongoDB does not support
Primary key	Primary key	Primary key MongoDB automatically sets the _id field as the primary key

MongoDB Installation

Official Installation Documentation https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/

vim /etc/yum.repos.d/mongodb-org-3.6.repo[mongodb-org-3.6]name=MongoDB Repositorybaseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/gpgcheck=1enabled=1gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc

yum list | grep mongodbyum install -y mongodb-org

MongoDB Connection

systemctl start mongod.servicenetstat -tlnp|grep mongodtcp        0      0 192.168.221.10:27017    0.0.0.0:*               LISTEN      1999/mongod         tcp        0      0 127.0.0.1:27017         0.0.0.0:*               LISTEN      1999/mongodmongo --port 27017 --host 192.168.221.10mongo -uusername -ppasswd --authenticationDatabase db

Introduction to NoSQL (vii)