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Home 2016 April NoSQL: Create your first Cassandra Keyspace

NoSQL: Create your first Cassandra Keyspace

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What is a Cassandra Keyspace?

A Keyspace is an object which is the outermost container for the data, column families, indexes, user-defined types and others.
It is very similar to Schema or Database of the Relational Database System.

Like a Relational Database, Keyspace has a name and a set of attributes that define the behaviour of the Keyspace.

You can create multiple Keyspaces for your application, but I would suggest creating one Keyspace per application.

What are the Keyspace attributes?

Replication Factor:
A Replication Factor represents the number of replica node which act as a copy of the data.
Using this attribute, you can decide that how many replica nodes require achieving the No – Data loss.
The value 3 is a standard value to set Replication Factor and it ensures the three copies of the Node.

Placement Strategy:
Simple Strategy: When we are dealing with only one data centre, we can set Simple Strategy in which all nodes are placed in the clocked wise direction in the ring without considering the node location.

Network Topology Strategy: When we are dealing with multiple data centres, we can set Network Topology Strategy in which all nodes are placed in the clocked wise direction with the related location information.

Create Keyspace if not exists:

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CREATE KEYSPACE IF NOT EXISTS dbrnd WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 3};

Describe all keyspaces:

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DESCRIBE Keyspaces;

Use a Keyspace:

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USE dbrnd;
 
/* output
cqlsh> USE dbrnd;
cqlsh:dbrnd>
*/

Drop Keyspace:

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DROP Keyspace dbrnd;

Apr 30, 2016Anvesh Patel
NoSQL: Install Single Node Cassandra 3.5 on Ubuntu 14.04NoSQL: Cassandra Query Language (CQL) Data Types
Anvesh Patel
Anvesh Patel

Database Engineer

April 30, 2016 Cassandra, NoSQLAnvesh Patel, Cassandra, Column Store, database, database research and development, dbrnd, Document Store, Graph Store, Key Value Store, Keyspace, NoSQL, Not Only SQL, Replication Factor, Unstrucutred
About Me!

I'm Anvesh Patel, a Database Engineer certified by Oracle and IBM. I'm working as a Database Architect, Database Optimizer, Database Administrator, Database Developer. Providing the best articles and solutions for different problems in the best manner through my blogs is my passion. I have more than six years of experience with various RDBMS products like MSSQL Server, PostgreSQL, MySQL, Greenplum and currently learning and doing research on BIGData and NoSQL technology. -- Hyderabad, India.

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