Premium

DataStax Cassandra Developer Certification Certification Questions and Answer (Dumps and Practice Questions)



Question : You have been given a Cassandra cluster (Ring) with nodes, and new KeySpace created by Admin named AcmeKeySpace
and you want to insert configuration data for your mobile application
named AcmeApp. And administrator had told you that default Replication Factor is 3 on this cluster for your AcmeKeySpace. Now
you have inserted 50 records in a table of your AcmeKeySpace.
Select correct statement which apply.


: You have been given a Cassandra cluster (Ring) with nodes, and new KeySpace created by Admin named AcmeKeySpace
1. After insert query, you have to execute another command named 'replicate-all', using cqlsh. So data can be
replicated on three nodes.

2. Before insert query, you have to execute another command named 'replicate-all', using cqlsh, for the
session. So data can be replicated on three nodes.

 3. Access Mostly Uused Products by 50000+ Subscribers

4. Either of 1 and 2


Correct Answer : Get Lastest Questions and Answer :
Explanation: Automatic data distribution: Cassandra provides automatic data distribution across all nodes that
participate in a ring or database cluster.
There is nothing programmatic that a developer or administrator needs to do or code to distribute data across a cluster
because data is
Transparently partitioned across all nodes in a cluster.

Built-in and customizable replication: Cassandra also provides built-in and customizable replication, which stores redundant
copies of data across nodes that participate in a Cassandra ring.
This means that if any node in a cluster goes down, one or more copies of that nodeas data is available on other machines in
the cluster.
Replication can be configured to work across one data center, many data centers, and multiple cloud availability zones.





Question : Which is true about replication factor having value more than


: Which is true about replication factor having value more than
1. Single node token range will be having more spread.

2. Overall storage capacity for different data will be reduced

 3. Access Mostly Uused Products by 50000+ Subscribers

4. 1 and 2
5. 1,2 and 3

Correct Answer : Get Lastest Questions and Answer :
Explanation: Replication factor means, you will be having more copy of your data in Cluster.

For example Replication factor =3, it means you will be having 3 copy of same data. And these three copy of data will be
stored across all the nodes in cluster. Hence, your overall capacity of storing different data will be reduced now.

Similarly more than one node will be storing same data, hence token range must be overlapped to store same data.





Question : You are working as a Database Architect for Arinika Inc. You have been given a project where expected data volume
is quite high, approximately 3TB in a month. For that you have to do data modeling, so which three layers come in your mind
while doing data modeling?



: You are working as a Database Architect for Arinika Inc. You have been given a project where expected data volume
1. Workflow, Logical, Physical

2. Conceptual, Logical, Physical

 3. Access Mostly Uused Products by 50000+ Subscribers

4. Physical, Logical, Conceptual


Correct Answer : Get Lastest Questions and Answer :
Explanation: You will first create Conceptual data model than logical data model and finally physical model.


Related Questions

Question : All the statements, you write in batch will be executed in order of defined
 : All the statements, you write in batch will be executed in order of defined
1. True
2. False


Question : You should use Cassandra client side join, if resources don't support the necessary data duplication
 : You should use Cassandra client side join, if resources don't support the necessary data duplication
1. True
2. False


Question : Which is true for Cassandra?
 : Which is true for Cassandra?
1. Cassandra supports join, but it needs to be avoided.

2. Cassandra does not support join at all

3. Access Mostly Uused Products by 50000+ Subscribers

4. If you have data in 3rd normal form then only you can apply joins in Cassandra



Question : . Ongoing repair operations in Cassandra ensure that all replicas of a row will eventually be _________


 : . Ongoing repair operations in Cassandra ensure that all replicas of a row will eventually be _________
1. Durable

2. Active

 3. Access Mostly Uused Products by 50000+ Subscribers

4. isolated



Question : As per the CAP theorem, Cassandra is a ________ database
 : As per the CAP theorem, Cassandra is a ________ database
1. CA

2. AP

 3. Access Mostly Uused Products by 50000+ Subscribers

4. CAP



Question : You can tune Cassandra's consistency level ____________
 : You can tune Cassandra's consistency level ____________
1. per-operation

2. set it globally for a cluster

 3. Access Mostly Uused Products by 50000+ Subscribers

4. 1 and 2

5. 1,2 and 3