introduction to nosql databases

original data set to improve query efficiency. Shortcomings are also more obvious, updating the reviewer data will be more troublesome.(4) Data coupling?: SQL does not allow the deletion of external data that has already been used, such as "Bear three" in the reviewer table has been assigned to the borrower bear big, then in the reviewer table will not be allowed to delete the bear three this data to ensure data integrity, and NoSQL there is no such

has been greatly weakened.Therefore, the relational database is less suitable in these more and more application scenarios, and the non-relational database to solve this kind of problem arises . NoSQL is a generalized definition of non-relational data storage. It breaks the unification of long-term relational database and acid theory . NoSQL data storage does not require a fixed table structure (for exampl

Label:About NoSQL1.1 System-to-data requirementsNosql[nosql main use Big data processing] all called "Not only SQL", for non-relational database [non-relational database is a relational database all features are not, the primary foreign key, constraints are not, SQL statements are not. ]。 The main features of this type of database are:Non-relational, distributed, open-source, horizontally scalable. The most typical application for

This article focuses on some of the things that are nosql, and the difference between the three databases of NoSQL, Memchache, MongoDB, and the ones that are more popular in the series. Here is the reading directory of this article, a NoSQL introduction1.Nosql IntroductionTh

can also be detected based on patterns between relationships (fraud in transaction).non-applicable occasionsThe graph database may not be applicable in some cases. This is the case when updating an entity in all or a subset. For example, in a "Data analysis solution" (analytics solution), all entities have to be updated as soon as one attribute is changed. The effect of the graph database is not ideal, because the simple operation can change a property in all nodes at once. Even if the data mod

. and the document database is more efficient than the key-value database query. such as: CouchDB, MongoDb. Domestic also has the document type database SEQUOIADB, already open source. Typical scenario: Web applications (similar to Key-value, value is structured, but the database is able to understand the content of value) Data model: Key-value corresponding key-value pairs, value is structured data Advantages and Disadvantages: The data structure requirements are not strict, the table structure

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 availabl

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.

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

Naresh Kumar is a software engineer and passionate blogger who has a great interest in programming and new things, and is happy to share technical research with other developers and programmers. Recently, Naresh wrote about 12 well-known free, open source NoSQL databases, and analyzed the characteristics of these databases.Now that NoSQL

dealing with web2.0 website, especially the super large-scale and high-concurrency SNS type web2.0 pure Dynamic Web site has become inadequate, exposing a lot of insurmountable problems, and non-relational database because of its own characteristics have been very rapid development. NoSQL databases are created to address the challenges of large-scale data collection multiple data types, especially big data

Tags: high extensible col body Interactive size and case login popular1. What is NoSQL?2. Why do I need NoSQL?The Internet has undergone 1.0 and 2.0 development;Web1.0 is the early Sina, Yahoo, etc. can only browse, can not interact;The traditional relational database is unable to cope with the dynamic website of web2.0, exposing a lot of problems that are difficult to overcome.2.1 High concurrency and read

Tags: default start GRE minimum NAL Web distribution will also be the caseNosqlWhat is NoSQLNon-relational databases are NoSQL, relational databases represent MySQLFor the relational database, it is necessary to store the data in the library, table, row, field, query the time according to the conditions of a line to match, when the equivalent is very large time a

Tags: mode aof tool occupies mic good data backup ICA database serverNoSQL IntroductionThe full name of NoSQL is not-only Sql, a concept that has been raised early in the morning, compared to fire in the 09. NoSQL refers to a non-relational database, and we often use relational databases. Like our usual mysql,sqlserver, these

advantage. Both sequential and random write performance is much faster than btree. 4) Leveldb for K-V storage structure, byte storage. One of the NoSQL databases, which does not support transactions, can only query data by key, and supports bulk read and write operations. 5) Leveldb key and value data size can not be too large, at the KB level, if the storage of large key or value, will have a greater impa

Background to the rise of NoSQL:1) The Rise of web2.0 (high interactivity), the traditional relational database in order to ensure the " universality " of the design has brought a complex function, high performance costs, and expensive problems.2) Avoid unnecessary complexity3) Higher throughput and high concurrency4) Ability to scale horizontally on commercial hardware5) NoSQL implementation of large table

Introduction to NoSQL (iii)Redis Data Type-string String is the simplest type, the same type as memcached, a key corresponding to a value, its supported operation is similar to the operation of memcached, it is more rich in functionality. Sets the object that can be stored in binary. Example[[emailprotected] redis-4.0.8]# redis-cli 127.0.0.1:6379> set mykey "Successful"OK127.0.0.1:6379> get mykey"S