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Cassandra Alter Keyspace

Cassandra Alter Keyspace for beginners and professionals with topics on architecture, relational vs no sql database, data model, cql, cqlsh, keyspace operations, table operations, installation, collections etc.

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Cassandra Alter Keyspace

The "ALTER keyspace" command is used to alter the replication factor, strategy name and durable writes properties in created keyspace in Cassandra.

Syntax:

ALTER KEYSPACE <identifier> WITH <properties>

Or

ALTER KEYSPACE "KeySpace Name"
WITH replication = {'class': 'Strategy name', 'replication_factor' : 'No.Of  replicas'};

Or

Alter Keyspace KeyspaceName with replication={'class':'StrategyName', 
	'replication_factor': no of replications on different nodes} 
    	with DURABLE_WRITES=true/false

Main points while altering Keyspace in Cassandra

  • Keyspace Name: Keyspace name cannot be altered in Cassandra.
  • Strategy Name: Strategy name can be altered by using a new strategy name.
  • Replication Factor: Replication factor can be altered by using a new replication factor.
  • DURABLE_WRITES: DURABLE_WRITES value can be altered by specifying its value true/false. By default, it is true. If set to false, no updates will be written to the commit log and vice versa.

Example:

Let's take an example to demonstrate "Alter Keyspace". This will alter the keyspace strategy from 'SimpleStrategy' to 'NetworkTopologyStrategy' and replication factor from 3 to 1 for DataCenter1. 

ALTER KEYSPACE TheDeveloperBlog
WITH replication = {'class':'NetworkTopologyStrategy', 'replication_factor' : 1};
Next TopicCassandra drop keyspace




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