nosql cap

model. AP wihtout C: To be highly available and allow partitioning, you need to discard the consistency. Once a partition occurs, the nodes may lose contact, and in order to be highly available, each node can only serve with local data, which can result in inconsistencies in global data. Many of the NoSQL classes now fall into this category. For most large-scale Internet applications, the host is numerous, the deployment is scattered, and no

In-depth analysis of NoSQL database distributed algorithms (graphic details), nosql text Although the NoSQL movement has not brought about fundamental technological changes to distributed data processing, it still triggers overwhelming research and practices on various protocols and algorithms. In this article, I will systematically describe the distributed featu

based on the CAP theory. The core idea is that even if it cannot reach Strong consistency ), however, Eventual consistency can be achieved through appropriate methods based on application characteristics. BASE is short for the three phrases Basically Available, Soft state, and Eventually consistent. It is an extension of C A in CAP. Meaning of BASE: (1) Basically Available: Basic Available; (2) Soft-state

opportunity to update the data . There are two main ways to achieve acid: the first is write ahead logging, which is the way of logging. The second kind is shadow paging .cap theorem: The cap theorem, also known as the cap principle, refers to consistency (consistency), availability (availability), Partition tolerance (partition fault tolerance) in a distrib

. However, because the current network is bound to have problems such as delayed packet loss, we must meet partition fault tolerance, only between strong consistency and availability tradeoff Therefore, according to the CAP principle, the NoSQL database is divided into three categories, which satisfies the CA principle, satisfies the CP principle and satisfies the AP principle.ca-single-point clusters, syst

I. Overview of CAP theoryA distributed system can meet only two of the three items of consistency (consistency), availability (availability), and partition fault tolerance (Partition tolerance) at the same time.ii. definition of Cap1, consistency consistencyConsistency means "all nodes see the same data at the same time", that is, when the update operation succeeds and returns to the client, all nodes are fully consistent at the same date.For consiste

properties of acid things. But because the execution of each sub-thing is distributed in the distributed transaction, it is very complicated to implement a distributed thing processing system which can guarantee the acid characteristic.Cap theoryA classic theory of distributed systems. The CAP theory tells us that a distributed system cannot satisfy both consistency (c:consistency), availability (a:availability), and partition fault tolerance (p:part

Cap,base and final consistency are the three cornerstones of NoSQL database. caps C:consistency consistency a:availability availability (refers to fast fetch data) P:tolerance of network Partition partition tolerance (distributed) in a football match, a player scored three goals in a game, saying It's a hat-trick (Hat-trick). In distributed Data systems, there is also a hat principle (

cannot meet the three requirements of consistency, availability, and partition fault tolerance at the same time, and can only satisfy two at the same time.Therefore, according to the CAP principle, the NoSQL database is divided into three categories which satisfy the CA principle, the CP principle and the AP principle: ca– single-point clusters, systems that meet consistency, availability, and are often le

[ArticleAuthor: Sun Li link: http://www.cnblogs.com/sunli/ updated by: 2011-2-21] The previous two articles, "Why use nosql" and "relational database or nosql Database", roughly introduced why nosql should be used and when nosql should be used. I often feel confused when I see the introduction of

acid things. But because the execution of each sub-thing is distributed in the distributed transaction, it is very complicated to implement a distributed thing processing system which can guarantee the acid characteristic.Cap theoryA classic theory of distributed systems. The CAP theory tells us that a distributed system cannot simultaneously meet the three basic requirements of consistency (c:consistency), availability (a:availability), and partitio

stand-alone database.2 Select AP, discard consistency, pursue partition tolerance and availability. This is a design-time choice for many distributed systems, such as many nosql systems.3 Choose CP, abandon usability, pursue consistency and partition tolerance. The availability of this option is low, and the problem of the network is directly unavailable to the entire system.As can be seen from the above analysis, in distributed systems, we generally

Detailed description of distributed algorithms and NoSQL algorithms in nosql Databases Today, we will study some distributed strategies, such as replication in fault detection. These strategies are marked in italics and divided into three parts: Data consistency. NoSQL requires a balance between consistency, fault tolerance, and performance of distributed syst

scalability, but at the expense of data consistency, data synchronization between nodes is not fast, but the final consistency of the data can be preserved. Most of the current stir NoSQL classes are typical AP type databases.The above is the original content;I think this explanation is a little bit out of the way, according to the description under the first CA combination, this high availability I thought should be robust,I am with this so-called d

What is cap? CAP is a set of solutions for distributed transactions developed by the Yang Xiaodong God in our garden, the first thousand-Star project in. Net Core community (now 1656 Star), lightweight, easy to use, and high performance. Github.com/dotnetcore/cap This blog is focused on ease of use, the narrative, together to see how the

The previous "Why Use NoSQL" and "relational database or NoSQL database" two articles generally explain why NoSQL is used, and when to use NoSQL. Often have friends encounter confusion, see the introduction of NoSQL, feel very good, but do not know how to formally use their

NoSQL Injection Analysis and relief, nosql injection relief Key points of this article: 1. learn about new security vulnerabilities targeting NoSQL 2. five types of NoSQL attack methods, such as repeat, joint query, JavaScript injection, back-to-back query (Piggybacked queries), and cross-Origin Violation 3. OWASP orga

(basic available), support partition failure (e.g.sharding fragmentation database) Soft State (soft state/flexible transaction), status can be unsynchronized for a period of time, asynchronous Eventually consistent (final consistency), the final data is consistent, and not always high consistent Theorem: The main emphasis on basic usability, that is, if the pursuit of high performance, then it is necessary to sacrifice consistency or fault tolerance, in short, base thinking is the

language Strict consistency Basic transaction NoSQL Represents more than just a 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, highly available and scalable

What is cap?CAP is a set of solutions for distributed transactions developed by the Yang Xiaodong God in our garden, the first thousand-Star project in. Net Core community (now 1656 Start), with its lightweight, easy-to-use, high-performance features.Https://github.com/dotnetcore/CAPThis blog is focused on ease of use, the narrative, together to see how the cap c