{"id":15046,"date":"2018-05-11T05:09:29","date_gmt":"2018-05-11T05:09:29","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=15046"},"modified":"2021-04-05T13:45:42","modified_gmt":"2021-04-05T08:15:42","slug":"cassandra-data-model","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/cassandra-data-model\/","title":{"rendered":"Cassandra Data Model | How Cassandra Stores Data"},"content":{"rendered":"<div class='__iawmlf-post-loop-links' style='display:none;' data-iawmlf-post-links='[{&quot;id&quot;:1914,&quot;href&quot;:&quot;http:\\\/\\\/cassandra.apache.org&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20210725052557\\\/http:\\\/\\\/cassandra.apache.org\\\/&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2025-12-10 08:13:30&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-13 21:02:59&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-16 22:40:09&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-21 09:37:11&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-26 12:16:50&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-29 18:03:35&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-03 15:18:30&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-07 19:10:53&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-11 05:40:10&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-14 16:16:42&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-17 20:58:21&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-22 13:32:11&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-25 13:38:32&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-29 13:35:59&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-01 23:23:53&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-05 07:02:58&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-08 15:02:49&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-12 11:23:22&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-17 09:37:29&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-22 06:36:03&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-25 14:12:52&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-28 22:39:30&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-04 13:09:40&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-09 01:26:10&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-12 22:16:19&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-17 10:58:32&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-21 03:00:05&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-25 03:59:29&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-29 05:19:54&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-03 03:15:28&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-08 01:52:27&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-11 04:13:23&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-15 03:31:18&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-18 09:11:57&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-21 12:26:09&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-25 00:02:08&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-28 09:41:34&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-03 14:39:42&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-12 05:46:00&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-15 07:21:42&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-18 15:30:40&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-21 18:51:09&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-25 07:17:54&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-28 14:01:44&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-31 15:35:15&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-06-04 05:55:00&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-06-07 12:14:11&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-06-10 23:17:23&quot;,&quot;http_code&quot;:206}],&quot;broken&quot;:false,&quot;last_checked&quot;:{&quot;date&quot;:&quot;2026-06-10 23:17:23&quot;,&quot;http_code&quot;:206},&quot;process&quot;:&quot;done&quot;}]'><\/div>\n<h2>1. Objective<\/h2>\n<p><span style=\"font-weight: 400\">In our last Cassandra article, we discussed <a href=\"https:\/\/data-flair.training\/blogs\/cassandra-architecture\/\"><strong>Apache Cassandra Architecture<\/strong><\/a>. In this <a href=\"https:\/\/data-flair.training\/blogs\/apache-cassandra-tutorial\/\"><strong>Cassandra tutorial<\/strong><\/a>, we will learn about the Cassandra Data Model. It is different from other DBMS. Data Model of Cassandra is basically the way a technology stores data. <\/span><\/p>\n<p><span style=\"font-weight: 400\">Moreover, this article will teach us how Cassandra stores data. Also, in this Cassandra data model tutorial,<strong>\u00a0<\/strong>we will see Cassandra Cluster and Cassandra Keyspace.<\/span><br \/>\nSo, let&#8217;s begin the Cassandra Data Model.<\/p>\n<div id=\"attachment_15164\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15164\" class=\"wp-image-15164 size-full\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01.jpg\" alt=\"Cassandra Data Model\" width=\"1200\" height=\"628\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01.jpg 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01-150x79.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01-300x157.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01-768x402.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Cassandra-Data-Model-01-01-1024x536.jpg 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><p id=\"caption-attachment-15164\" class=\"wp-caption-text\">Cassandra Data Model | How Cassandra Stores Data<\/p><\/div>\n<h2>2. Cluster in Cassandra Data Model<\/h2>\n<p><span style=\"font-weight: 400\">In Cassandra\u00a0Data model, Cassandra database stores data via<a href=\"https:\/\/data-flair.training\/blogs\/cassandra-cluster\/\"><strong> Cassandra Clusters<\/strong><\/a>. Clusters are basically the outermost container of the distributed Cassandra database. The database is distributed over several machines operating together. <\/span><\/p>\n<p><span style=\"font-weight: 400\">Every machine acts as a node and has their own replica in case of failures. These nodes are arranged in a ring format as a cluster. <\/span><\/p>\n<h2><span style=\"font-weight: 400\">3. What is Cassandra Keyspace?<\/span><\/h2>\n<p><span style=\"font-weight: 400\">In the Cassandra Data Model, Cassandra Keyspace is a container for data. It\u00a0contains many attributes. The basic attributes are:-<\/span><\/p>\n<h3>a.\u00a0Replication Factor<\/h3>\n<p><span style=\"font-weight: 400\">It basically signifies the number of copies of a data. In other words, the number of nodes in a cluster that are copies of a data.<\/span><br \/>\n<strong><a href=\"https:\/\/data-flair.training\/blogs\/cassandra-books\/\">Apache Cassandra Books: Best Books To Learn Cassandra<\/a><\/strong><\/p>\n<h3>b.\u00a0Replica Placement Strategy<\/h3>\n<p><span style=\"font-weight: 400\">It replicates the data in a <a href=\"http:\/\/cassandra.apache.org\/\">Cassandra<\/a> Cluster. There are two types of strategies, namely: <\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400\">Simple Strategy (for single data center)<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Network Topology Strategy (for multiple data centers).<\/span><\/li>\n<\/ul>\n<h3>c. Cassandra Column Families<\/h3>\n<p><span style=\"font-weight: 400\">Column Family in Cassandra is a collection of rows, which contains ordered columns. They represent a structure of the stored data. These Cassandra Column families are contained in Keyspace. There is at least one Column family in each Keyspace.<\/span><\/p>\n<div id=\"attachment_15160\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15160\" class=\"wp-image-15160 size-full\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2.png\" alt=\"Cassandra Data Model\" width=\"1200\" height=\"628\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2.png 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2-150x79.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2-300x157.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2-768x402.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-2-1024x536.png 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><p id=\"caption-attachment-15160\" class=\"wp-caption-text\">Cassandra Data Model- Column Family in Cassandra<\/p><\/div>\n<p><span style=\"font-weight: 400\">The rows in each column are once again the collection of many columns. The columns are the basic unit of the data structure in Cassandra. Columns have three values stored in them. They are key or columns name, timestamp and value. <\/span><\/p>\n<p><span style=\"font-weight: 400\">Furthermore, the columns in these rows can be added or removed as the requirement of the user. Whereas the Cassandra column families are predefined and hence, cannot be changed. There is also a super column family and that super Column family is Table with a collection of many columns. <\/span><\/p>\n<p><span style=\"font-weight: 400\">It increases the efficiency of a program. It groups all the columns used regularly as binds them in a single space.<\/span><br \/>\n<strong><a href=\"https:\/\/data-flair.training\/blogs\/cassandra-documented-shell-commands\/\">Let&#8217;s revise Cassandra Documented Shell Commands<\/a><\/strong><\/p>\n<div id=\"attachment_15161\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15161\" class=\"wp-image-15161 size-full\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1.png\" alt=\"Cassandra Data Model\" width=\"1200\" height=\"535\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1.png 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1-150x67.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1-300x134.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1-768x342.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2018\/05\/Data-model-1-1024x457.png 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><p id=\"caption-attachment-15161\" class=\"wp-caption-text\">Cassandra Data Model-\u00a0 Rows in Cassandra Column Family<\/p><\/div>\n<p>Cassandra Column family has many attributes some of them are:<\/p>\n<h4>i. Keys cached<\/h4>\n<p><span style=\"font-weight: 400\">Number of locations to keep cached per SSTable.<\/span><\/p>\n<h4>ii. Rows cached<\/h4>\n<p><span style=\"font-weight: 400\"> A number of rows whose content will be cached in memory.<\/span><\/p>\n<h4>iii. Preload row cache<\/h4>\n<p><span style=\"font-weight: 400\">Gives you an option to pre-populate the row cache.<\/span><br \/>\n<a href=\"https:\/\/data-flair.training\/blogs\/cassandra-api\/\"><strong>Learn Apache Cassandra API<\/strong><\/a><br \/>\nSo, this was all about the Cassandra Data Model. Hope you like our explanation of how to store data in Cassandra.<\/p>\n<h2>4. Conclusion: Cassandra Data Model<\/h2>\n<p><span style=\"font-weight: 400\">Hence, we understood the data model of Cassandra. Moreover, we saw Cassandra Cluster and Cassandra Keyspace and its attributes. At last, we discussed the replication factor, the replica placement strategy, and Cassandra Column family in detail.<\/span><\/p>\n<p><span style=\"font-weight: 400\"> In our next article, we will go through the <a href=\"https:\/\/data-flair.training\/blogs\/cassandra-data-types\/\"><strong>Data types<\/strong> <strong>used in Cassandra<\/strong><\/a>. Furthermore, if you have any query, feel free to ask in the comment section.<\/span><br \/>\n<strong>See also &#8211;<\/strong><br \/>\n<strong><a href=\"https:\/\/data-flair.training\/blogs\/cassandra-curd-operation\/\">Cassandra Curd Operation<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Objective In our last Cassandra article, we discussed Apache Cassandra Architecture. In this Cassandra tutorial, we will learn about the Cassandra Data Model. It is different from other DBMS. Data Model of Cassandra&#46;&#46;&#46;<\/p>\n","protected":false},"author":7,"featured_media":15164,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[2315,2327,2333,2342,2343,2346,2362,2384,2396,3383,5855],"class_list":["post-15046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cassandra","tag-cassandra","tag-cassandra-cluster","tag-cassandra-column-family","tag-cassandra-data-model","tag-cassandra-data-model-tutorial","tag-cassandra-database","tag-cassandra-keyspace","tag-cassandra-replication","tag-cassandra-tutorial","tag-data-model-in-cassandra","tag-how-cassandra-stores-data"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cassandra Data Model | How Cassandra Stores Data - DataFlair<\/title>\n<meta name=\"description\" content=\"Cassandra data model, Cassandra database, how Cassandra stores data, Cassandra Clusters, Cassandra Keyspace, Cassandra replication,Cassandra column families\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/cassandra-data-model\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cassandra Data Model | How Cassandra Stores Data - 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