top nosql databases

Tags: connection pool disk PHP return pip NSA file __name__ receiveThe difference between a non-relational database and a relational database: Benefits of non-relational databases: Performance NoSQL is based on key-value pairs, which can be imagined as the corresponding relationship between the primary key and the value in the table, and does not need to be parsed by the SQL layer, so the performa

Tags: HBA Office software Development Services Information Content Unified Lotus SearchNoSQL (not only SQL), meaning "not just SQL," is a new revolutionary movement in the database, which was raised early on, and the trend grew even more in the 2009. NoSQL advocates are advocating the use of non-relational data storage, which is undoubtedly a new kind of thinking injection, relative to the overwhelming use of relational

Tags:xml recommended orm high concurrency hardware and software Conditions Ecology Database Tables deployment Not in any scenario, NoSQL is superior to relational databases. Let's talk a little bit about when to use NoSQL to compare power:1) database table schema changes frequentlyFor example, the online store, the maintenance of product properties often to

First, the basic knowledge of NoSQL1. About NoSQLIn the word "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. To a certain extent, but the long-term is still valuable. Since when a relational database is t

systems, static and dynamic schema support, memory processing, and high availability. Densodb The. Net solution written in c # By DensoDB is simple, fast, and reliable. SisoDB A document database built on SQL Server. SDB Some small online databases are written in PHP. NoSQL embedded db Node. js-based Asynchronous NoSQL Embedded Database Key value/tuples data sto

The most common explanation for NoSQL is that non-relational, or not-only SQL, can be seen from the field meaning that it refers to the generic term of a non-relational database.Background of the birth of NoSQLWith the development of the distributed architecture of large-scale Web sites, the use of traditional relational databases seems to be inadequate in the following ways:1, high concurrent read and writ

Label:NoSQL databases are, of course, an essential part of the past architecture selection and practical use. We used the typical NoSQL databases of cassandra,mongodb,redis,hbase, respectively.1,cassandra:Cassandra from the installation configuration, to the use, load balancing mechanism, and so on, is undoubtedly one of the most convenient uses of these emerging

transactions in the database (transaction) have ACID4 basic features that can be compared to trading:1,A (atomicity) atomicityEverything in the transaction is either completed or failed during execution and is rolled back.2,C (consistency) ConsistencyThe database should be in a consistent state.For example: Existing integrity constraints a+b=10, if a transaction changes A, then B must be changed3,I (isolation) IndependenceThe concurrent transactions do not affect each other.If the data to be acc

How SQL solves the problem of excessive data volumeTypically, we use SQL databases to store our data. At the beginning of the project, the user volume is smaller, the corresponding data volume is relatively small, and the concurrency pressure is relatively small. As our web applications become more and more popular, users will soar, traffic will soar, and the amount of data will become larger. And then they go through a few changes. 1. Primary and Sta

With the development of Internet technology, the traditional relational database can not be satisfied with the storage and analysis of massive data, thus deriving a database NoSQL (not only SQL) which is different from the relational database.The more mature nosql in foreign countries have mongodb,cassandra,tokumx and so on, not listed.As far as I know, bat and other giants have their own

I. The introduction of NoSQL1. What is NoSQL NoSQL = not-only SQL Non-relational database 2. Why Use NoSQL High performance-highly concurrent read and write Huge Storage-efficient storage and access to massive data High Scalability High availablity-highly scalable and highly available Second, four categories of

Tags: start scala understanding operation NULL Conditional Protocol Note log fileIn a previous article, "Introduction to Graphical Database Neo4j", we introduced a very popular method of using graphical database neo4j. In this article, we'll simply introduce another type of NoSQL database--cassandra. The reason for exposure to Cassandra is the same as that of contact neo4j: Our products need to be able to record large amounts of data that cannot be pr

way, and repetition is for less interaction;Disadvantages The aggregation structure is advantageous to some interactions, but hinders other interactions;For example, when the student ID is used to aggregate student information (including student name, class, age, and other information, or even English scores, all the information of the student can be queried in an interaction, but it is very difficult to query it by the Student name; ACID transactions that span multiple aggregates are n

Originally from: Http://www.infoq.com/cn/articles/MarkLogic-NoSQL-with-TransactionsThe Java platform is painstakingly working to provide the developer with the database persistence functionality for almost the entire life cycle. Have you tried the early JDBC specification, EJB, O/R mappings such as Hibernate, or the recent JPA specification, you are unlikely to have encountered a relational database on this path. Perhaps you already understand the dif

engaged in enterprise application development and integration. As early as 1980s, Fowler was an advocate who used object technology to build multi-layer enterprise applications. He wrote several classic books: Analysis Mode, UML essence, and refactoring. He changed the pattern of human software development. He was honored by developers as "Godfather" and never talked to the media about anything other than technology. Martin Fowler, a mysterious scientist, finally opened his mind for the first t

NoSQL (nosql=not only sql), meaning the SQL movement, is a new revolutionary movement of the database, which was first suggested in the early days that the trend is growing to 2009, which refers to the non-relational database , With the rise of Internet Web2.0 Web site, the traditional relational database in dealing with Web2.0 website, especially the super-large-scale and high-concurrency SNS type Web2.0 P

Article Source: http://article.yeeyan.org/view/271351/239915Although SQL database is a very useful tool, the monopoly is about to be broken after 15 years of a single show. This is only a matter of time: forced to use relational databases, but eventually found to be unable to adapt to the needs of the numerous.But the difference between NoSQL databases is far mor

command to open other databases, such as Select 1, if you want to switch back to the default database later, just select 0. in the area of data storage, Redis follows the mainstream idea of the existing NoSQL database, that is, key as the unique identifier of the data retrieval, we can simply understand it as the key of the index in the relational database, and value as the main object of the data storage.

The first part: Concept 1, why use NoSQLImpedance detuning: The difference between the relational model of a relational database and the data structure in memory.Integration Database : Multiple applications that are typically developed by different teams store their data in a common database.application Database : Its contents can only be accessed directly from the code base of one application, and this codebase is maintained by a team.Use NoSQL reaso

Reprinted from Http://www.codingkit.com/mongodb/nosql.htmlNoSQL (NoSQL = not-only sql), meaning "not just sql."On modern computing systems, a huge amount of data is generated every day on the network.A significant portion of this data is handled by the relational database management system (RDMBSS). The 1970 E.f.codd's paper "A Relational model of data for large shared data banks", which makes data modeling and application programming easier.The appli