Cassandra Concepts: Difference between revisions
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=Overview= | =Overview= | ||
Cassandra is a key-value database. | 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= | =CQL= | ||
Revision as of 20:49, 25 September 2019
Internal
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';
Schema
Keyspace
Keyspace Operations
Table
Row
Column
Partition Key
Has primary key, or lookup key semantics.