Thursday, 29 October 2015

Cassandra interview questions: Difference between Cassandra's schema and RDBMS schema?

The following table lists down the points that differentiate the schema of Cassandra from that of an RDBMS.

S.NRDBMSCassandra
1RDBMS deals with structured data.Cassandra deals with unstructured data.
2It has a fixed schema.Cassandra has a flexible schema.
3In RDBMS, a table is an array of arrays. (ROW x COLUMN)In Cassandra, a table is a list of “nested key-value pairs”. (ROW x COLUMN key x COLUMN value)
4Database is the outermost container that contains data corresponding to an application.Keyspace is the outermost container that contains data corresponding to an application.
5Tables are the entities of a database.Tables or column families are the entity of a keyspace.
6Row is an individual record in RDBMS.Row is a unit of replication in Cassandra.
7Column represents the attributes of a relation.Column is a unit of storage in Cassandra.
8RDBMS supports the concepts of foreign keys, joins.Relationships are represented using collections.
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