What is NoSQL?

NoSQL, "not only SQL" means that  databases are not based on the classical architecture of relational databases. Originally developed to manage big data, the NoSQL database use has exploded in recent years.
But what really NoSQL?


       

Types of NoSQL

When speaking of NoSQL, we are including database systems that are not relational, but be aware that there are several types of databases "NoSQL".

The key / value based, used to store information in the form of a key / value pair where the value can be a string, integer, or a serialized object. A Redis database. This type of database offers very good performance by its simplicity and can even be used to store user sessions or the cache of your website for example.

Oriented databases columns, similar to relational databases because the data is saved as a line with columns, but is distinguished by the fact that the number of columns may vary from line to line. The best known solutions are HBase or Cassandra.

Oriented databases document represents the information into XML or JSON object. The advantage is to simply retrieve information structured hierarchically. The best known solutions are CouchDB, MongoDB and RavenDB.

Oriented databases graph, present the data in a node and relationships. This structure allows to simply recover complex relationships. A graph basic example is Neo4j.


Performances


We read often enough that non-relational databases are more "efficient" and "scalable".

The problem of relational databases is that they are difficult to distribute across multiple servers often forced to make "vertical scaling." It increases the power of the server hosting the database to obtain better performance and better reflect the charge. NoSQL databases support "horizontal scaling", a database can be distributed on a "pool" servers allowing to share performance. The advantage of this method is that it allows to adapt the architecture according to the load by distributing more or fewer servers as appropriate.









Comments

Post a Comment

Popular posts from this blog

Twitter API with PHP

Image
In order to use a communicante with a website ( in this case twitter) , we need to call it's  api But there too many standars to communicate with api ( OAuth1, OAuth2...) , hopefully they provides api documentation . In this tutoriel we are gonna use twitter api ( 1.1  ) as exemple to get ou last tweets , but first we have to create twitter application Creating twitter application give us  some random strings `consumer_secret`, `consumer_key`, `access_token` and  `access_token_secret` We will use these strings later in OAuth process. Don't panic no need to knowing all OAuth process using  php , Moreover, there are many php libraries and packages to do this for us , there is a very popular one ( twitter-api-php ) first we create an empty folder for our project then require the package : composer require  j7mbo/twitter-api-php copy and past random strings from your twitter application in to this array  variable :  $settings = array ( ' oau
Read more

Realtime Chat Application with CakePHP and Socket.IO #1

Image
In this blog we will build a Realtime Chat Application with CakePHP and Socket.IO Your are free to use another framework, the idea is just learning the basics and a few (Socket.IO) tips Database :  To store our data for this application we need 4 tables :  users :         contains user's informations such as username and password hash ,email ...  messages : contains messages between users, it also store the information of sender and destination  user companies : or teams table ,in order to organise groups i add this table to give the user the freedom  of organizing his contact it stores the company name with his owner .   companies_users : it contains the users and their respective  companies here the SQL file fo database structure     file in the next tutorial we'r gone started building the frontend using cakephp  
Read more

Let's build a mobile application with Ionic Framework #3

Image
Today We 're gonna start to write some code , first is make a main controller to our ionic application , of course by controller i mean angularjs controller . we start by add ng-controller to our body tag , but this is just a reference to controller we need also to create this controller (MainController) .  The idea is just use http call to get the data.json AngularJS comes with built in $ http service  to make (GET,UPDATE,POST,DELETE) in our case we are are doing get call app.controller('MainController',function ($scope,$http) {   // body...   $http.get("data.json")     .then(function(response) {         console.log(response)     }); }) we are just login data in the console. NB : the http call could make some time before it returns the  data in , our case we are working localy, but in real life we have to work with web services and  probably internet connection like mine lol, you guessed it, we need to use some techniq
Read more