Cassandra Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is Apache Cassandra?
Apache Cassandra is a highly scalable and distributed NoSQL database system designed to handle large amounts of data across multiple commodity servers without a single point of failure.
Ques 2. What is a key space in Cassandra?
A key space in Cassandra is a namespace that defines data replication on nodes. It is the outermost container for data, similar to a database in the relational database world.
Ques 3. Explain the concept of a node in Cassandra.
A node in Cassandra is an individual server that stores data. Nodes work together to form a distributed and decentralized database system.
Ques 4. What is a column family in Cassandra?
In Cassandra, a column family is a container for rows. It is similar to a table in a relational database and consists of columns and rows.
Ques 5. What is a Cassandra data center?
A Cassandra data center is a logical grouping of nodes that are geographically close to each other. Data centers are used for replication and fault tolerance purposes.
Ques 6. How does Cassandra ensure fault tolerance?
Cassandra achieves fault tolerance through data replication. Each piece of data is replicated across multiple nodes in the cluster, ensuring that if a node fails, the data is still available on other nodes.
Ques 7. What is the purpose of the nodetool utility in Cassandra?
Nodetool is a command-line utility in Cassandra that provides various administrative tasks, such as monitoring the cluster, managing compaction, and performing other maintenance operations.
Ques 8. What is the CQL (Cassandra Query Language)?
CQL is a query language for interacting with Cassandra databases. It is similar to SQL but is specifically designed for NoSQL databases and includes support for creating, updating, and querying data in Cassandra.
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