Collection Data Type: SET

The following diagram illustrates the various categories of data types offered by Apache Cassandra.

Collections

In Apache Cassandra, collections are data types that allow storing multiple values within a single column (within a single cell). They provide a way to group related data in a single field, thereby simplifying table design, and providing efficient data retrieval and atomic operations. 

Collections are designed to store small amounts of data. For example, email addresses and phone numbers of a user etc. Before incorporating collection data types in the data model, the access patterns, data size, and potential growth of the collection should be considered to ensure optimal performance. Excessive or inappropriate use of collections can lead to inefficient query execution and data management challenges. 

Storing large amounts of data in a collection is an anti-pattern.

Cassandra does not allow a single element of a collection value to be accessed as collections are read in their entirety. The FROZEN keyword can be used to ...