In this Apache Cassandra tutorial you will learn Cassandra from the basics to get a clear idea of why Cassandra is such a powerful NoSQL database system. Cassandra is a high performance, high availability and highly scalable distributed database that works well with structured, semi-structured and unstructured data. For structured data we have the RDBMS, so a database like Cassandra is mainly used for storing and manipulating unstructured data.
Apache Cassandra is a highly scalable, high-performance distributed database designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is a type of NoSQL database. Let us first understand what a NoSQL database does.
Learn Cassandra in 12 hrs from experts
This Cassandra tutorial can be beneficial to anybody who wants to learn NoSQL databases. Software developers, database administrators, architects, managers can take this Cassandra tutorial as a first step to learn Cassandra and excel in their careers.
There are no prerequisites to learn Cassandra from this Cassandra tutorial. If you have a basic knowledge of databases, then it is good.
Before we learn Cassandra, let us first understand the difference between a NoSQL database and a relational database through this table:
|Comparison criteria||NoSQL database||Relational database|
|Type of data handled||Mainly unstructured data||Only structured data|
|Volume of data||High Volume||Low Volume|
|Type of transactions handled||Simple||Complex|
|Single point of failure||No||Yes|
|Data arriving from||Many locations||A few locations|
Apache Cassandra is on open source powerful, distributed NoSQL database that does not have a single point of failure and is extremely scalable and highly available. Cassandra was originally developed at Facebook and later open sourced and is currently part of the Apache Software Foundation.
A NoSQL or Not Only SQL is a set of databases that provide a way to store and retrieve data that is not in the standard tabular format followed by relational databases. The NoSQL databases of which Cassandra is a very popular database share some common features and attributes. The NoSQL databases do not have any schema, they support easy replication of data, they have a simple API, they do not exhibit the ACID properties but are eventually consistent and finally last but not the least, they can handle huge volumes of data.
Some of the properties of a NoSQL database include:
In this section of the Cassandra tutorial we list some of the major points why Cassandra is such a widely used NoSQL database.
Here in this section of the Cassandra tutorial we will discuss some of the top features of Cassandra
Apache Cassandra is one of the most widely used NoSQL databases. Here we list some of the top applications of Cassandra.
Cassandra is a top NoSQL database and it is finding more and more users with each passing day. Since we are living in a world of big data, Cassandra is finding huge acceptance since it was built for big data. Also a lot of the organizations are moving from the traditional relational database systems to NoSQL databases and thus Cassandra is their natural choice. All this means that the job market for Cassandra is just heating up and the salaries for Cassandra professionals are among the best in the big data domain. All these are compelling reasons for you to learn Cassandra and excel in your career.
Welcome to big data SQL: No Sql Big data is among the most buzzing words in past few years. Actually Big data technologies are set of tools specially designed and architect to store, process and analyze big data (i.e. data in the order of 1000’s of GB). These tools are specially curved to handle variety of data (i.e. audio Read More
Cassandra architecture is based on the understanding that system and hardware failures occurs eventually. Before talking about Cassandra lets first talk about terminologies used in architecture design. Node: Is computer (server) where you store your data. It is the basic infrastructure component of Cassandra. Data center :A collection of related nodes. A data center can be Read More
Cassandra is available for download from the Web at http://cassandra.apache.org . The simplest way to get started is to download the prebuilt binary. please refer to steps below for linux: 1.) Download Cassandra in any directory mkdir -p /root/nosql cd /root/nosql #Please download latest version available wget http://www.us.apache.org/dist/cassandra/1.2.16/apache-cassandra-1.2.16-bin.tar.gz tar -xvzf apache-cassandra-1.2.16-bin.tar.gz mv apache-cassandra-1.2.16 /root/nosql/cassandra. 2.) Next, Read More
In relational data model we have outer most containers which is call as data base. Each Data base will correspond to a real application for example in an online library application data base name could be library . Data base contains table which could be mapped to real world entity example books in library corresponds to book Read More
CQL is simple api mean for accessing Cassandra.CQL adds an abstraction layer that hides implementation details of this structure and provides native syntaxes for collections and other common encodings. Common ways to access CQL are: • Start cqlsh, the Python-based command-line client, on the command line of a Cassandra node. • For developing applications, use one Read More
There are multiple client api available for Cassandra Training. However the preferred interface to Cassandra 1.2 and 2.0 is CQL. Earlier it used to be thrift. List of all available Cassandra clients can be found at https://wiki.apache.org/cassandra/ClientOptions#CQL Briefly we would talk about Java cql. Source code is self explanatory package com.intellipaad; import com.datastax.driver.core.BoundStatement; import com.datastax.driver.core.Cluster; import com.datastax.driver.core.PreparedStatement; Read More
There are multiple dimensions where Cassandra performance can be tuned. Some of them are described below: Write Operations: Commit log and data dirs (sstables) should be on different disks. Commit log uses sequential write however, if SSTables share the same drive with commit log , I/O contention between commit log & SSTables may deteriorate commit log Read More
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