MongoDB (1) Introduction & Installation configuration

MongoDB Getting Started column

Http://blog.csdn.net/column/details/19681.html
about MongoDB
MongoDB, written by the C + + language, is an open-source NoSQL database system based on distributed file storage, which, under high load, adds more nodes to ensure server performance and is designed to provide scalable, high-performance data storage solutions for Web applications.
MongoDB stores data as a document and data structures consist of key-value (key=>value) pairs. A MongoDB document is similar to a JSON object. Field values can contain other documents, arrays, and array of documents.


MongoDB Home: https://www.mongodb.com
MongoDB Official document: Https://docs.mongodb.com NoSQL and RDBMS MongoDB is a typical NoSQL database that distinguishes MYSQL,ORACLE,DB2 from these traditional relational databases;

	Rdbms	Nosql
Characteristics	-Highly organized structured data -Structured Query Language (SQL) (SQL) -Data and relationships are stored in separate tables. -Data manipulation language, data definition language -Strict consistency -Basic services	-represents more than just SQL -No declarative query language -No pre-defined pattern -key-value pair storage, column storage, document storage, graphics database -final consistency, not ACID properties -Unstructured and unpredictable data -Cap theorem -High performance, high availability and scalability
Follow the principles	ACID principle A (atomicity) atomicity C (consistency) consistency I (isolation) Independence D (Durability) Persistence	Cap principle Consistency (consistency) (all nodes have the same data at the same time) Availability (availability) (ensures that each request responds regardless of success or failure) Delimited tolerance (Partition tolerance) (loss or failure of any information in the system does not affect the continued operation of the system)

The following are the categories and sections of NoSQL that represent:

Column Storage	Hbase, Cassandra, hypertable
Document storage	MongoDB, CouchDB
Key-value Storage	Tokyo cabinet/tyrant, Berkeley DB, Memcachedb, Redis
Diagram Storage	NEO4J, FLOCKDB
Object storage	Db4o, Versant
XML database	Berkeley DB XML, BaseX

The following is a partial SQL concept that corresponds to the MongoDB concept:

SQL Terminology/Concepts	MongoDB Terminology/Concepts	Explanation/Description
Database	Database	Database
Table	Collection	Database Tables/Collections
Row	Document	Data record lines/documents
Column	Field	Data fields/Fields
Index	Index	Index
Table joins		Table connection, MongoDB not supported
Primary key	Primary key	Primary key, MongoDB automatically sets the _id field as the primary key

MongoDB Installation ConfigurationThe following is an example of the MongoDB installation configuration of the Linux environment, which is similar to the operation in the OS X,window environment;
DownloadSelect the appropriate MongoDB version to download, note the Windows version of the mongodb-3.6 MSI installer may appear when the progress bar stuck in the installation situation, you can directly kill the thread, directly start the configuration step, or download the installation version 3.4 MongoDB; Download address : https://www.mongodb.com/download-center?jmp=tutorials&_ga= 2.97410399.1138236154.1518440736-1543170749.1518440736#community

UnzipLinux version is generally downloaded after a compressed package, the package can be extracted to obtain MONGODB running program, assuming that the compression package extracted after the directory mongodb-3.6.2, in order to facilitate startup, the Mongodb-3.6.2/bin directory is generally written to the system PATH variable; MONGODB-3.6.2/Create data,logs two directories, respectively, for storing data and logs:

assad@desktop-assad:/usr/bin/mongodb-3.6.2$ mkdir Data

assad@desktop-assad:/usr/bin/mongodb-3.6.2$ mkdir Logs

Then you need to set all the files under MONGODB-3.6.2/group and own;
Start MongoDB ServiceThere are 2 ways to run the MongoDB service, the first is to specify the running parameters directly, the second is to specify the configuration file, which first shows the first;

assad@desktop-assad:/usr/bin/mongodb-3.6.2/bin$ Mongod--dbpath=/usr/bin/mongodb-3.6.2/data--logpath=/usr/bin/ Mongodb-3.6.2/logs/mongo.log # Specify Data,logpath location to run MongoDB service

Connect to MongoDB

Assad@desktop-assad ~ $ MONGO

MongoDB Shell version v3.6.2

Connecting to:mongodb://127.0.0.1:27017

MongoDB Server version:3.6.2

......

>

Here I have already written the path variable of the Mongodb-3.6.2/bin to the system path, if there is no need to locate the directory to execute the instruction;

set the administrator passwordMongoDB default does not set the password, in order to set a security setting at least one administrator password, the steps are as follows:

Assad@desktop-assad ~ $ MONGO # login in MongoDB

>show DBS; # Show all existing tables

Admin 0.000GB

Local 0.000GB

> Use admin # using the admin database

Switched to DB admin

> Db.createuser ({User: "Assad", pwd: "mongo123", roles:["root"]}) # Create a user in the admin database

Successfully added User: {"user": "Assad", "roles": ["Root"]}

After that, restart the MongoDB service and start in Auth authentication mode as follows:

assad@desktop-assad:/usr/bin/mongodb-3.6.2/bin$ Mongod--dbpath=/usr/bin/mongodb-3.6.2/data--logpath=/usr/bin/ Mongodb-3.6.2/logs/mongo.log--auth

At this point, if directly logged into the MongoDB service, all database operations will be rejected, need to login with a password:

Assad@desktop-assad ~ $ mongo-u assad-p mongo1994 127.0.0.1:27017/admin # Log in to MongoDB as an administrator

> Show DBS

.....

using a configuration file to start the MongoDB serviceThe above MongoDB boot process parameters are cumbersome, you can write a configuration file from the configuration file to start MongoDB, the following is a sample configuration file:
/etc/mongod.conf

# for documentation of all options, see:

# http://docs.mongodb.org/manual/reference/configuration-options/

# Where and how to store data.

Dbpath=/usr/bin/mongodb-3.6.2/data

Journal=true

# Where to write logging data.

Logpath=/usr/bin/mongodb-3.6.2/logs/mongod.log

Logappend=true

# Network Interfaces

bind_ip=127.0.0.1

port=27017

# Security

Auth=true

Start the MongoDB service from this configuration file:

$ mongod-f/etc/mongod.conf

The parameters in the configuration file are actually explained by MONGO--help;

MongoDB GUI InterfaceMongoDB provides a simple HTTP user interface, if you want to enable this feature, you only need to start with the parameter--rest, as follows:

$ mongod-f