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



Question : Relationship among Employee, Secretary and Engineer are covering?
: Relationship among Employee, Secretary and Engineer are covering?
1. True

2. False



Correct Answer : 2
Explanation: Covering constraint: Union of subtype entities is equal to set of supertype entities. An entity is an
element of at least one subtype.
Employee is either a secretary or a engineer (or even both) -- does not cover





Question : Which data growth is ok, for dataset in Cassandra?
: Which data growth is ok, for dataset in Cassandra?
1. Linear
2. Quadratic
3. Higher Order
4. Constant


Correct Answer : 4
Explanation: Yes, constant growth is always better.





Question : Class standing of freshmen, sophomore, Junior, Senior are covering or not
: Class standing of freshmen, sophomore, Junior, Senior are covering or not
1. True

2. False


Correct Answer : 1
Explanation: It is covering all union of all 4 are equal to Student set. And Jr can not be a Sr.



Related Questions

Question : Freshman, Sophomore, Junior, Senior are disjoint sets, and in this case covers, too.
 : Freshman, Sophomore, Junior, Senior are disjoint sets, and in this case covers, too.
1. True
2. False


Question : Employee is not disjoint


 : Employee is not disjoint
1. True
2. False



Question : Select all the features provided by Cassandra, from below list.
A. Cassandra is a partitioned row store database
B. Automatic data distribution: Cassandra provides automatic data distribution across all nodes that participate in a ring or
database cluster.
C. 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.
D. Cassandra supplies linear scalability

 : Select all the features provided by Cassandra, from below list.
1. A,B,C
2. B,C,D
3. A,C,D
4. A,B,C,D


Question : Select correct statement for Cassandra database, w.r.t. RDBMS
A. Cassandra is designed as a distributed database with peer-to-peer communication.
B. As a best practice, queries should involve at least two table.
C. Data should be de-normalized.
D. client-side joins can be used in applications, after data fetch from Cassandra.

 : Select correct statement for Cassandra database, w.r.t. RDBMS
1. A,B,C
2. B,C,D
3. A,C,D
4. A,B,C,D


Question : Select correct statement which applies for CQL.
A. CQL and SQL share the same abstract idea of a table constructed of columns and rows.
B. Cassandra emphasizes denormalization through CQL features like collections and clustering specified at the schema level
C. Cassandra does not support joins.
D. Cassandra does not support subqueries.

 : Select correct statement which applies for CQL.
1. A,B,C
2. B,C,D
3. A,C,D
4. A,B,C,D


Question : Which all are possible using cqlsh
A. you can create keyspaces
B. you can create tables
C. you can insert and query tables

 : Which all are possible using cqlsh
1. A,B
2. B,C
3. A,C
4. A,B,C