Big Data Analytics Week 3 - MongoDB and Cassandra

Apache Cassandra is a NoSQL database that belongs to the following category. Select the right answer

• Document Database

• Wide column Database

• Graph Database

• Relational Database

Consider the following example cases. For which of them would Cassandra be most suitable? Select all that apply.

• Your project requires very high processing power that necessitates several nodes

• The proportion of write operations is significantly higher than read operations.

• The proportion of read operations is significantly higher than write operations.

• Your project requires processing power that can be achieved with a single node

Answer explanation

A primary feature of Apache Cassandra is that it is optimised for excellent throughput on writes.

Mongo DB is a ______. Select the correct answer.

• Document Database

• Wide Column Database

• Graph Database

• Relational Database

Which of the following has higher availability? MongoDB or Cassandra

• MongoDB

• Cassandra

Answer explanation

MongoDB comprises of primary and secondary nodes. In the event of failure, a secondary node is elected as master. Cassandra supports multiple master nodes. In the event of failure, master node is replaced with no downtime.

In terms of complex queries on dynamic data model, which one is better? MongoDB or Cassandra?

• MongoDB

• Cassandra