Adaface Sample Cassandra Questions

Rinsha works at a private equity fund, where they have subscribed to feeds from several companies that track startups. The feeds are delivered in multiple formats such as CSV files,  access to their RDBMS or NOSQL (Cassandra) database or daily incremental data. What should Rinsha use in Cassandra to load/ migrate data from one Cassandra cluster to another?

You're a system architect troubleshooting read inconsistencies on a globally distributed Cassandra cluster. A developer informs you that sometimes when reading data, outdated information is retrieved. You decide to dive deeper into the read path.
            
            The application reads data using the following CQL:

Given the known facts:
            
            1. The cluster spans three data centers.
            2. The replication factor is set as 3 for each data center.
            3. The read must return only after fetching data from 2 nodes in each data center.
            4. You want to utilize the read repair mechanism to address the inconsistencies.
            
            Which consistency level should replace the '?' in the `SELECT` statement to ensure the above requirements?

The startup Ro is working at has a Cassandra cluster (Ring) with 7 nodes, and the admin set up a new KeySpace named CoralKeySpace. Ro wants to insert configuration data for their mobile application named CoralApp. The admin has told Ro that the default Replication Factor is 3 on this cluster for CoralKeySpace. Ro inserted 40 records in a table of CoralKeySpace. Which of the following apply?

A: Before the insert query, Ro needs to execute a replicate-all command using cqlsh for the session, so that the data can be replicated on 3 nodes. 
            B: After the insert query, Ro needs to execute a replicate-all command using cqlsh, so that the data can be replicated on 3 nodes. 
            C: Ro does not need to do anything, replication is taken care of by Cassandra.