{"id":20285,"date":"2013-05-10T12:55:27","date_gmt":"2013-05-10T07:25:27","guid":{"rendered":"http:\/\/vskills.in\/certification\/tutorial\/?p=20285"},"modified":"2024-04-12T14:16:39","modified_gmt":"2024-04-12T08:46:39","slug":"keyspaces-api-definitions","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/keyspaces-api-definitions\/","title":{"rendered":"Keyspaces API definitions"},"content":{"rendered":"<p><a class=\"vsc\" href=\"http:\/\/www.vskills.in\/certification\/Certified-Cassandra-Professional\"><span class=\"vsc-cn\" style=\"text-align: center;\"><span style=\"color: red;\">Certify and Increase Opportunity.<\/span><br \/>\n<span style=\"color: green;\">Be <\/span><br \/>\nGovt. Certified Apache Cassandra Professional<br \/>\n<\/span><\/a><\/p>\n<h3><strong>Keyspaces API definitions<\/strong><\/h3>\n<p>The keyspace is the container for your application data, similar to a schema in a relational database. Keyspaces are used to group column families together. Typically, a cluster has one keyspace per application.<\/p>\n<p>Replication is controlled on a per-keyspace basis, so data that has different replication requirements should reside in different keyspaces. Keyspaces are not designed to be used as a significant map layer within the data model, only as a way to control data replication for a set of column families.<br \/>\nDefining Keyspaces.<\/p>\n<p>Data Definition Language (DDL) commands for defining and altering keyspaces are provided in the various client interfaces, such as Cassandra CLI and CQL. For example, to define a keyspace in CQL:<\/p>\n<p>CREATE KEYSPACE keyspace_name WITH<br \/>\nstrategy_class = &#8216;SimpleStrategy&#8217;<br \/>\nAND strategy_options:replication_factor=&#8217;2&#8242;;<\/p>\n<p>Or in Cassandra CLI:<\/p>\n<p>CREATE KEYSPACE keyspace_name WITH<br \/>\nplacement_strategy = &#8216;SimpleStrategy&#8217;<br \/>\nAND strategy_options = {replication_factor:2};<\/p>\n<h2>Creating a Keyspace<\/h2>\n<p>You can use the Cassandra CLI commands described in this section to create a keyspace. In this example, we create a keyspace called <tt>demo<\/tt>, with a replication factor of 1 and using the <tt>SimpleStrategy<\/tt> replica placement strategy.<\/p>\n<p>Note the single quotes around the string value of <tt>placement_strategy<\/tt>:<\/p>\n<div>\n<div>\n<pre>[default@unknown] CREATE KEYSPACE demo\nwith placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy'\nand strategy_options = {replication_factor:1};<\/pre>\n<\/div>\n<\/div>\n<p>You can verify the creation of a keyspace with the <tt>SHOW KEYSPACES<\/tt> command. The new keyspace is listed along with the <tt>system<\/tt> keyspace and any other existing keyspaces.<\/p>\n<div class=\"apply\">\n<h3>Apply for Apache Cassandra Certification Now!!<\/h3>\n<p><a href=\"http:\/\/www.vskills.in\/certification\/Certified-Cassandra-Professional\">http:\/\/www.vskills.in\/certification\/Certified-Apache-Cassandra-Professional<\/a><\/p>\n<h4>Go To Tutorial- <a href=\"https:\/\/www.vskills.in\/certification\/tutorial\/apache-cassandra-professional\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Certified Apache Cassandra Professional Tutorial<\/strong><\/a><\/h4>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Certify and Increase Opportunity. Be Govt. Certified Apache Cassandra Professional Keyspaces API definitions The keyspace is the container for your application data, similar to a schema in a relational database. Keyspaces are used to group column families together. Typically, a cluster has one keyspace per application. Replication is controlled on a per-keyspace basis, so data&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[63],"tags":[],"class_list":["post-20285","page","type-page","status-publish","hentry","category-apache-cassandra"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Keyspaces API definitions - Tutorial<\/title>\n<meta name=\"description\" content=\"Keyspaces API definitions. 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