Cassandra - Interview Questions and Answers for 'Cassandra' | Search Interview Question

Cassandra - Interview Questions and Answers for 'Cassandra' - 8 question(s) found - Order By Newest

Q1. What is Apache Cassandra ?

Ans. Apache Cassandra is a free and open source distributed NoSQL database management system designed to handle large amounts of data providing high availability with no single point of failure.

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Q2. Is Cassandra read optimized or Write optimized ?

Cassandra

Ans. Read optimized

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Q3. How Cassandra provides better Read performance than Oracle Indices ?

Database

Ans. Cassandra uses Hash Search which provides a look time of O(1) whereas Oracle Indices uses Binary Search that provide a lookup time of O(Log n).

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Q4. How different is the Search algorithm when we query Cassandra Tables and When we query Oracle Tables ?

Cassandra

Ans. Relational Database uses linear search if we don't query using indices. Performance for linear search is O(n). If indices have been used , relational database uses binary search. Performance for binary search is O(Log n).

Casandra uses hash search. Performance for Hash Search is O(1).

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Q5. Can we query Cassandra Tables without specifying the partition id in the where clause ?

Cassandra

Ans. No.

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Q6. What are the restrictions on querying Cassandra Tables ?

Cassandra

Ans. Cassandra Tables can only be queried using the partition key and then cluster keys, so all queries should have partition key for sure.

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Q7. Which of the following databases - Cassandra / Oracle - provides more flexibility about querying the database ?

Database

Ans. Oracle as it is not modeled for a particular query or set of queries.

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Q8. Why was Cassandra written in Java and not C++ ?

Cassandra

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