Difference between Cassandra and RDBMS

Cassandra vs RDBMS

Cassandra RDBMS
Deals with unstructured data. Deals with structured data.
Flexible schema. Fixed schema.
Table can be understood as a list of “nested key-value pairs”, i.e., Row x Column Key x Column value) Table can be understood as an array of arrays, i.e., Row x Column.
Keyspace is the outermost container containing data of an application. Database is the outermost container containing data of an application.
Tables or column families are the entity of a keyspace. Tables are the entities of a database.
Row is a unit of replication. Row is an individual record.
Column is a unit of storage. Column represents the attributes of a relation.
Collections are used to represent relationships. There are concept of foreign keys, joins, etc.

 

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