nosql overview

large-scale SNS website, the daily user generates a huge amount of user dynamics, taking foreign friendfeed as an example, one months to reach 250 million user dynamics, for the relational database, in a 250 million records of the surface of the SQL query, the efficiency is extremely low even intolerable. 3. High Scalability hi availability-requirements for database scalability and high availability Currently Sina Weibo's Redis and Google's BigTable and Amazon's simpledb are using

NoSQL database This concept for a long time, but also see a lot of companies and products are in use, the pros and cons seem to be analyzed clearly. But there is a doubt in my mind, what is its appearance in order to solve the problem?User Information table, book information table, user Rating Information table for the book, comment form.Now imagine to do a page that shows the content of the comments, there will be information about the user and relat

Tags: using os data problem ardiv work time Introduction to the NoSQL Database Chapter 1th Basics of NoSQL Databases 11.1 relational and NoSQL databases 21.1.1 What is a brief history of NoSQL 21.1.2 relational database 21.1.3 database classification 31.1.4 relational database Advantages of 51.1.5 relational databa

about their own views.With the Ali Department of "go to IoE" movement in the community's propaganda louder and louder, the domestic is set off a "go to XXX" technology tide. Not only are internet companies, including operators and financial institutions, already starting to join the trend. As the "O" in the movement of the Oracle database, naturally become the target of criticism, many CIOs and CTO have shown a desire to remove the quick expression. So in the actual application scenario, how ex

Basic concepts of one or two peopleNoSQL, which refers to non-relational databases.Relational database is a database based on the relational model.The relational model is mentioned here,The relational model was proposed by E.f.codd in 1970.Compared with the level and mesh model, it has the following characteristics:1. Simple data structure (two-dimensional table)2. A solid theoretical basis.A. Relational operation theoryB. Relational model design theoryIn simple terms, the relational model refer

Source: maurizioturatti. comblog20150106using-nosql-wrong-reason I recently saw a report that PostgreSQL beat MongoDB in many important places under certain conditions, which reminds me of the theory behind different options in terms of data storage selection, especially in SQL and NoSQL Solutions Source: http://maurizioturatti.com/blog/2015/01/06/using-nosql-wro

Advantages and disadvantages of relational databaseAdvantages: Can do transaction processing, so as to ensure the consistency of data; Can be a join, such as multi-table query; Because of SQL standardization, the cost of data updates is small (the same fields are basically only one place). Disadvantages: The write processing of large amount of data is not easy; If the table data volume is too large, it is not easy to do index or table structure update; When the field is

Tags: fetching data Post overview Val condition info using last column storageNoSQL Database Overview Characteristics Mode freedomYou do not need to define a table structure, and each record in the data table may have different properties and formatting. Inverse normalizationDo not follow the paradigm requirements, remove the integrity constraints, reduce the dependency between ta

Basic knowledge about NoSQL Databases This article is from: NoSQL database getting started. For details about how to download the PDF version, seeWhat is NoSQL? Have you heard of NoSQL? In recent years, this word has received a lot of attention. When you see the word "NoSQL"

SQL daily thin Xishan NoSQL standardization is imperative bitsCN.com Like Lary herison's luxury yacht, relational databases are heading for the sunset. However, for NoSQL, standard query languages and application interfaces need to be set up. Oracle has dominated the database world for many years, but in the future, the decline of hegemony is inevitable. Under the impact of

Label:first, the basic knowledge of NoSQL 1. About NoSQL The term "NoSQL" is actually created by a colleague called Racker, when John Evanseric to organize an event to discuss open source distributed databases. This is the name and concept. Some people oppose the NoSQL term because it sounds like we define what we are.

The scalability of NoSQL systems is the main reason for the development of NoSQL, including distributed system coordination, failover, resource management and many other features. In this case, NoSQL sounds like a big basket, and everything can be inserted. Although the NoSQL movement has not brought about fundamental

System scalability is the main reason for promoting the development of NoSQL, including distributed system coordination, failover, resource management and many other features. So that NoSQL listening System scalability is the main reason for promoting the development of NoSQL, including distributed system coordination, failover, resource management and many other

Why is there NoSQL? With the development of the Internet, when we turn a server into two servers, when we start to build data backup, when we need to add a buffer layer, to adjust all the query, put more hardware.Finally, it is necessary to divide the data into multiple clusters and reconstruct a large number of application logic to fit the segmentation. After a while, you'll find yourself constrained by the data structure you've been designing a few

Label:Original: http://juliashine.com/distributed-algorithms-in-nosql-databases/ A distributed algorithm for NoSQL databasesOn November 9, 2012 in also for rice beam, by Juliashine This article was translated from distributed algorithms in NoSQL Databases The scalability of the system is the main reason for the development of the

Have you heard of ldquo and NoSQLrdquo? In recent years, this word has received a lot of attention. When you see the word ldquo; NoSQLrdquo;, you may mistakenly think it is ldquo; No! Have you heard of ldquo and NoSQLrdquo? In recent years, this word has received a lot of attention. When you see the word ldquo; NoSQLrdquo;, you may mistakenly think it is ldquo; No! This article is from: NoSQL database getting started. For details about how to dow

[Switch] The distributed algorithms of NoSQL databases repost A Very Good distributed algorithm of NoSQL databases. The content of this article is as follows: the original article is published in the famous technical blog "HighlyScalableBlog". the distributed algorithms and ideas in NoSQL databases are described in detail. The article is very long and translated

Tags: nosql nosql database MongoDB hbase Navigation Lately I've been busy trying to sort out the NoSQL knowledge and the NoSQL databases that I know. One is to deepen your understanding of NoSQL, and the other is to organize the knowledge you

First, overview: unordered character set , and as with the list type, we can also perform operations such as adding, deleting, or judging whether an element exists on a data value of that type. It should be stated that the time complexity of these operations is O (1), which is the completion of the operation within a constant time. The maximum number of elements that a set can contain is 4294967295. Unlike the list type, duplicate elements are not al

NoSQLNareshKumar is a software engineer and enthusiastic blogger who is very interested in programming and new things and is very happy to share technical research results with other developers and programmers. Recently, Naresh wrote about 12 well-known free and open-source NoSQL databases and analyzed their features. NoSQL databases are becoming more and more popular. here I have summarized some very good,