DataStax Cassandra Developer Certification Certification Questions and Answer (Dumps and Practice Questions)
Question : cassandra database is not good for, which of the following datatypes?
1. large amounts of structured
2. large amounts of semi-structured
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4. large amounts of XML data
5. None of the above
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Explanation: Apache Cassandra is a massively scalable open source NoSQL database.
Cassandra is perfect for managing large amounts of structured, semi-structured, and unstructured data across multiple data
centers and the cloud.
Question : Select correct statement, which applies for Cassandra NoSQL database.
A. Cassandra delivers continuous availability
B. Cassandra delivers linear scalability
C. Cassandra has operational simplicity across many commodity servers
D. Cassandra can have single point of failure.
1. A,B,C
2. B,C,D
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4. A,B,C,D
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Explanation: Apache Cassandra is a massively scalable open source NoSQL database. Cassandra is perfect for
managing large amounts of structured, semi-structured, and unstructured data across multiple data centers and the cloud.
Cassandra delivers continuous availability, linear scalability, and operational simplicity across many commodity servers with
no single point of failure, along with a powerful dynamic data model designed for maximum flexibility and fast response times.
Question : You have been given a Cassandra cluster (Ring) with nodes, and you want to create new KeySpace and insert data
for your mobile application named AcmeApp.
1. You have to connect primary node in Ring and needs to create Database connection with it.
2. You can connect any two nodes (Defined by Admin) in Ring and needs to create Database connection any of
these two nodes.
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4. You can connect any nodes in Ring but at a time you can use only one node from ring for your database
operations.
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Explanation: Cassandra is a partitioned row store database: Cassandra's architecture allows any authorized
user to connect to any node in any data center and access data using the CQL language.
For ease of use, CQL uses a similar syntax to SQL. The most basic way to interact with Cassandra is using the CQL shell,
cqlsh.
Using cqlsh, you can create keyspaces and tables, insert and query tables, plus much more. If you prefer a graphical tool,
you can use DataStax DevCenter.
For production, DataStax supplies a number drivers so that CQL statements can be passed from client to cluster and back.
Related Questions
Question : Entities and relationships, equality search attributes, inequality search attributes, ordering attributes, key
attributes. Is the correct order of mapping rule?
1. True
2. False
Question : Static columns are stored only once per partition?
1. True
2. False
Question : Which is true with regards to Cassandra partition size
1. One of the measure of partition size are the number of values in a partition
2. One of the measure of partition size is partition size on disk
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4. 1 and 2
5. 1,2 and 3
Question : . If you have data duplicated across the various tables in Cassandra. Consistency is the Cassandra's
responsibility. So you update the record in one table, it will be propagated across all the tables in same Keyspace to
maintain the consistency?
1. True
2. False
Question : Which of the following will help in maintaining the consistency in Cassandra nodes
1. stored procedures
2. transactions
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4. logged batch
Question : . Which of the following is correct with regards to batch in Cassandra?
1. Batches are written to a log on a coordinator node.
2. Replicas will take over if the coordinator node fails mid-batch.
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4. 1 and 3
5. 1,2,3