Datastax Cassandra Administrator Certification Questions and Answer (Pratice Questions and Dumps)

Question-: Which of the following should be enabled for the Cassandra nodes to be performed better?
A. CPU Frequency Scaling
B. zone_reclaim_mode
C. swap
D. Clock Synchronization


Answer: D

Explanation: You should disable the following settings for each node on which Cassandra installed for better performance.

1. CPU frequency scaling
2. Zone_reclaim_mode
3. Access Mostly Uused Products by 50000+ Subscribers
Clock synchronization is certainly required for all the nodes in the cluster. Because data read/write, replication and repair depend on the timestamp of the data.

Admin only


Question-: When a new node joins the cluster, it first contacts the node which is
A. Nearest IP address
B. Nearest distance
C. Based on the Specified in the Cassandra.yaml file
D. Coordinator node

Answer: C

Explanation: There is a property in the Cassandra.yaml file which is called seed_provider. In which you list the seed nodes which are reached by the new joining as soon as new node is added to the cluster. And all the nodes in the cluster should use the same list of seed node.


Admin only



Question-: You have just joined a company called Acmeshell Inc. which has the free comment solution which anyone can embed in their website. And you are the administrator and decided to use Cassandra. As you have to decide the size of the cluster for next one year, which of the following data dimension you would be considering?

A. Throughput
B. Data model
C. Latency
D. Data Growth Rate
E. Java version to be used

Answer: A,C,D

Explanation: While deciding the cluster size you have to consider the following things
1. What throughput is needed, which is measured as GB/second
2. How fast you need data to be read and write in the cluster.
3. Access Mostly Uused Products by 50000+ Subscribers

Admin only

Related Questions

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Question-: Which of the following is you should define when setting up multiple datacenter cluster?
A. Use the NetworkTopologyStrategy
B. Use the SimpleStrategy
C. You should use the LOCAL_ONE or LOCAL_QUORUM consistency level to avoid latency during write operation.
D. You should use the EACH consistency level to avoid latency during write operation.
E. You should specify the Snitch.



Question-: You have Cassandra cluster setup using one datacenter having total nodes in it. You created keyspace using the following command.
ALTER KEYSPACE HE_KEPSPACE WITH replication={‘class’ : ‘NetworkTopologyStrategy’ , ‘DC1’ : 1 , ‘DC2’ : 2}

Which of the following statement is true?

A. This command would fail because there is only one datacenter and you have defined the two datacenters in the command.
B. This command would be successful and local datacenter would be created using the 3rd node in the cluster.
C. This command would fail as this would not be able to create 3 copy of the data.
D. This command would be successful, without any error.


Question-: If you are adding a new datacenter to your existing cluster then which of the following command you should use?
A. nodetool repair
B. nodetool rebuild
C. nodetool update
D. nodetool refresh


Question-: Which of the following statements are valid for COPY command in the CQL (Cassandra Qury Language).

A. This is a replacement for the DSBulk command.
B. When importing data using COPY command, it is fine to have each row different number of columns.
C. If the column data type is integer then empty value automatically inserted as zero.
D. You should import less than million records using this command.


Question-: Which of the following command you can use to dump the SSTable in JSON format?

A. SSDump
B. sstabledump
C. sstablejsondump
D. Importsstable


Question-: Which of the following command would help in loading the SSTable to Cassandra cluster?
A. CQL Copy command
B. sstabledump
C. DSBulk
D. sstableloader