mongodb簡介

MongoDB簡介 (Introduction to MongoDB)

MongoDB is a NoSQL database which stores the data in form of key-value pairs. It is an Open Source, Document Database which provides high performance and scalability along with data modelling and data management of huge sets of data in an enterprise application.

MongoDB是一個NoSQL數據庫，它以鍵值對的形式存儲數據。 它是一個開放源代碼 文檔數據庫 ，可提供高性能和可伸縮性，以及企業應用程序中海量數據集的數據建模和數據管理。

MongoDB also provides the feature of Auto-Scaling. Since, MongoDB is a cross platform database and can be installed across different platforms like Windows, Linux etc.

MongoDB還提供了自動擴展功能。 由于MongoDB是跨平臺數據庫，因此可以跨Windows，Linux等不同平臺安裝。

什么是基于文檔的存儲？ (What is Document based storage?)

A Document is nothing but a data structure with name-value pairs like in JSON. It is very easy to map any custom Object of any programming language with a MongoDB Document. For example : Student object has attributes name, rollno and subjects, where subjects is a List.

文檔不過是具有名稱/值對的數據結構，例如JSON。 使用MongoDB文檔映射任何編程語言的任何自定義對象非常容易。 例如： Student對象有屬性name ， rollno和subjects ，其中主體是一個列表。

Document for Student in MongoDB will be like:

MongoDB中用于學生的文檔將類似于：

{
	name : "Stduytonight",
	rollno : 1,
	subjects : ["C Language", "C++", "Core Java"]
}

We can see, Documents are actually JSON representation of custom Objects. Also, excessive JOINS can be avoided by saving data in form of Arrays and Documents(Embedded) inside a Document.

我們可以看到，文檔實際上是自定義對象的JSON表示形式。 另外，可以通過以文檔內部的數組和文檔（嵌入式）形式保存數據來避免過多的JOINS。

MongoDB的簡要歷史 (Brief History of MongoDB)

MongoDB was developed by Eliot Horowitz and Dwight Merriman in the year 2007, when they experienced some scalability issues with the relational database while developing enterprise web applications at their company DoubleClick. According to Dwight Merriman, one of the developers of MongoDB, this name of the database was derived from the word humongous to support the idea of processing large amount of data.

MongoDB由Eliot Horowitz和Dwight Merriman于2007年開發 ，當時他們在DoubleClick公司開發企業Web應用程序時遇到了關系數據庫的一些可伸縮性問題。 根據MongoDB的開發者之一Dwight Merriman的說法，該數據庫名稱源自humongous一詞，以支持處理大量數據的想法。

In 2009, MongoDB was made as an open source project, while the company offered commercial support services. Many companies started using MongoDB for its amazing features. The New York Times newspaper used MongoDB to build a web based application to submit the photos. In 2013, the company was officially named to MongoDB Inc.

2009年，MongoDB成為一個開源項目，而該公司提供了商業支持服務。 許多公司開始使用MongoDB的驚人功能。 《紐約時報》報紙使用MongoDB構建了一個基于Web的應用程序來提交照片。 2013年，該公司正式更名為MongoDBInc 。

MongoDB的主要功能 (Key Features of MongoDB)

Apart from most of the NoSQL default features, MongoDB does bring in some more, very important and useful features :

除了大多數NoSQL默認功能之外，MongoDB確實帶來了更多，非常重要和有用的功能：

1. 

2. MongoDB has a rich Query Language, supporting all the major CRUD operations. The Query Language also provides good Text Search and Aggregation features.
   MongoDB具有豐富的查詢語言，支持所有主要的CRUD操作。 查詢語言還提供了良好的文本搜索和聚合功能。
3. Auto Replication feature of MongoDB leads to High Availability. It provides an automatic failover mechanism, as data is restored through backup(replica) copy if server fails.自動復制功能可實現高可用性。 它提供了一種自動故障轉移機制，因為如果服務器發生故障，則可以通過備份（副本）副本還原數據。
4. Sharding is a major feature of MongoDB. Horizontal Scalability is possible due to sharding.
   分片是MongoDB的主要功能。 由于分片，可能具有水平可伸縮性。
5. MongoDB supports multiple Storage Engines. When we save data in form of documents(NoSQL) or tables(RDBMS) who saves the data? It's the Storage Engine. Storage Engines manages how data is saved in memory and on disk.
   MongoDB支持多個存儲引擎。 當我們以文檔（NoSQL）或表（RDBMS）的形式保存數據時，誰來保存數據？ 它是存儲引擎。 存儲引擎管理如何將數據保存在內存和磁盤中。

使用MongoDB的組織 (Organizations that use MongoDB)

Below are some of the big and notable organizations which are using MongoDB as database for most of their business applications.

以下是一些使用MongoDB作為大多數業務應用程序數據庫的著名大型組織。

• Adobe
  土坯
• LinkedIn
  領英
• McAfee
  邁克菲
• FourSquare
  四方
• eBay
  易趣
• MetLife
  大都會人壽
• SAP
  樹液

翻譯自: https://www.studytonight.com/mongodb/introduction-to-mongodb

mongodb簡介