Cassandra Concepts

Internal

• Cassandra

Overview

Cassandra is NoSQL a key-value database. It provides continuous availability with no single point of failure. The database uses a ring design and consistent hashing. In a ring design there is no master node, all nodes are identical and communicate with each other as peers. This architecture allows it to scale horizontally, by incrementally adding nodes with no reconfiguration. Provides good performance for large amounts of data.

CQL

Cassandra Query Language

SELECT "email" FROM "user_tweets" WHERE "username" = 'john';

Keyspace

Keyspace Operations

• List Keyspaces
• Describe a Keyspace

Partition Key

Has primary key, or lookup key semantics.