{"id":415,"date":"2021-07-13T04:54:18","date_gmt":"2021-07-13T04:54:18","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=415"},"modified":"2021-09-13T11:40:37","modified_gmt":"2021-09-13T11:40:37","slug":"what-is-cassandra-data-modelling","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/cassandra\/what-is-cassandra-data-modelling\/","title":{"rendered":"What is Cassandra data modelling ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"cassandra-data-modelling\" class=\"color-purple\" style=\"text-align: justify;\">Cassandra data modelling:<\/h2>\n<\/div>\n<\/div>\n<div class=\"row\">\n<div class=\"col-sm-12\">\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Cassandra database is distrubuted over multiple machines that perform together.<\/li>\n<li>The outermost container is known as the Cluster. For failure handling, every node have a replica, and in case of a failure, the replica takes charge.<\/li>\n<li>Cassandra order the nodes in a cluster, in a ring format, and assigns data to them.<\/li>\n<li>The data model of Cassandra is significantly various from normally what can we see in an Relational Database Management System.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/cassandra\/nosql-database1.gif\" alt=\"nosql database\" width=\"619\" height=\"351\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"cluster\" class=\"color-purple\">Cluster:<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>The Group of independent servers (usually in close proximity to one another) interconnected via network to work as one centralized data processing resource.<\/li>\n<li>Clusters are working for multiple complex instructions by distributing workload across all connected servers.<\/li>\n<li>Clustering develops the system\u2019s accessibility to users, its\u00a0<b>aggregate performance<\/b>, and\u00a0<b>overall tolerance to faults\u00a0<\/b>and\u00a0<b>component failures<\/b>.<\/li>\n<li>A failed server is automatically shut down and its users are switched immediately to the other servers.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"text-center row\" style=\"text-align: justify;\"><\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"key-space\" class=\"color-purple\">Key space:<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Key space is the edge container for data in Cassandra.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<p>The basic attributes of a Key space in Cassandra are,<\/p>\n<ul>\n<li>Replication factor<\/li>\n<li>Replica placement strategy<\/li>\n<li>Column families<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"replication-factor\" class=\"color-purple\">Replication factor :<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>It represent the cluster contain the number of machines that will collect duplicate of the same data.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"replica-placement-strategy\" class=\"color-purple\">Replica placement strategy :<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>It is nothing but the strategy to point replicas in the ring.<\/li>\n<li>We have strategies such as simple strategy (rack-aware strategy), old network topology strategy (rack-aware strategy), and network topology strategy (datacentre-shared strategy).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"column-families\" class=\"color-purple\">Column families :<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Key space is a edge for a order of one or more column groups.<\/li>\n<li>A column groups, in turn, is a edge of a order of rows. Each row have a ordered columns.<\/li>\n<li>Column families define the structure of your data.<\/li>\n<li>Each keyspace contain at least one and often many column families.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\">\n<div class=\"hddn\" style=\"text-align: justify;\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/cassandra\/what-is-cassandra-data-modelling 1.png\" alt=\"what is cassandra data modelling\" width=\"960\" height=\"564\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : The Group of independent servers (usually in close proximity to one another) interconnected via network to work as one centralized data processing resource&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2642],"tags":[195,201,2674,2661,2692,1119,203,2705,2720,2717,2645,2662,2737,2735,2733,2744,2734,2738,2747,2746,2741,2745,2660,2703,2643,2659,2658,2644,2740,2736,2739,2748,199,214,363,209,283,2732,2676,2709,205,485,196,212,712,2663,2742,207,711,204,282,208,206,2677,200,2118,197,280,364,2743,216,285],"class_list":["post-415","post","type-post","status-publish","format-standard","hentry","category-cassandra","tag-accenture-interview-questions-and-answers","tag-allstate-solutions-pvt-ltd-interview-questions-and-answers","tag-apache-cassandra-data-model","tag-apache-cassandra-interview-questions","tag-apache-cassandra-tutorial","tag-att-interview-questions-and-answers","tag-capgemini-interview-questions-and-answers","tag-cassandra-certification-passing-score","tag-cassandra-certification-preparation","tag-cassandra-certification-questions","tag-cassandra-certification-sample-questions","tag-cassandra-clare-interview","tag-cassandra-data-model","tag-cassandra-data-model-time-series","tag-cassandra-data-model-tutorial","tag-cassandra-data-modeling-best-practices","tag-cassandra-data-modeling-example","tag-cassandra-data-modeling-tool","tag-cassandra-data-modelling-best-practices","tag-cassandra-data-models","tag-cassandra-database-certification","tag-cassandra-database-model","tag-cassandra-dba-interview-questions","tag-cassandra-developer-practice-test","tag-cassandra-frequently-asked-questions","tag-cassandra-interview-questions","tag-cassandra-interview-questions-and-answers","tag-cassandra-multiple-choice-questions","tag-cassandra-real-world-examplen","tag-cassandra-sample-database","tag-cassandra-sample-dataset","tag-cassandra-storage-model","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-cgi-group-inc-interview-questions-and-answers","tag-ciena-corporation-interview-questions-and-answers","tag-collabera-technologies-interview-questions-and-answers","tag-conduent-interview-questions-and-answers","tag-cql-interview-questions","tag-cvent-interview-questions-and-answers","tag-datastax-cassandra-certification-questions","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-ernst-young-interview-questions-and-answers","tag-ibm-interview-questions-and-answers","tag-indecomm-global-services-interview-questions-and-answers","tag-indiabulls-technology-solutions-ltd-interview-questions-and-answers","tag-interview-questions-on-cassandra","tag-learn-cassandra","tag-mphasis-interview-questions-and-answers","tag-nagarro-software-pvt-ltd-interview-questions-and-answers","tag-oracle-corporation-interview-questions-and-answers","tag-persistent-systems-interview-questions-and-answers","tag-prokarma-softech-pvt-ltd-interview-questions-and-answers","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-synechron-technologies-pvt-ltd-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-tecnotree-interview-questions-and-answers","tag-unitedhealth-group-interview-questions-and-answers","tag-virtusa-consulting-services-pvt-ltd-interview-questions-and-answers","tag-wells-fargo-interview-questions-and-answers","tag-what-is-cassandra-data-modelling","tag-wipro-interview-questions-and-answers","tag-xoriant-solutions-pvt-ltd-interview-questions-and-answers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Cassandra data modelling ? 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