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



Question : You have a website, which hosts various Books and books having attributes like title, author, publisher etc.
Which of the following component in ER diagram conceptually represent each book
: You have a website, which hosts various Books and books having attributes like title, author, publisher etc.
1. Relationship

2. Entity

 3. Access Mostly Uused Products by 50000+ Subscribers

4. It could be either Entity or Relationship


Correct Answer : Get Lastest Questions and Answer :
Explanation: In ER diagram , objects can be represented using Entity like each Book can be represented using Book
entity for each individual book.




Question : Weak Entity type cannot exist without strong entity type (Assume they have relationship exist)
: Weak Entity type cannot exist without strong entity type (Assume they have relationship exist)
1. True
2. False

Correct Answer : Get Lastest Questions and Answer :
Explanation: Yes, Weak entity type cannot exist without an identifying relationship to a strong entity type.
Example without Video entity Encoding entity cannot exist.





Question : Which all are the advantages of the conceptual data modeling?
: Which all are the advantages of the conceptual data modeling?
1. Conceptual Data Modeling helps in collaboration between both technical and non-technical team members

2. Conceptual Data Modeling provides abstraction from the problem details

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4. 1 and 3

5. 1,2 and 3

Correct Answer : Get Lastest Questions and Answer :
Explanation: Conceptual Data Modeling is good and help in
Collaboration between both technical and non-technical team members
Provides abstraction from the problem details
Better understanding of the domain



Related Questions

Question : You have been given below ER Diagram


What is the correct table design to satisfy below query?

Query: Find all books that is subscribed by a subscriber, subject and support writing year range, with most writing year first
then sorted by title.

 : You have been given below ER Diagram
1. A
2. B
3. Access Mostly Uused Products by 50000+ Subscribers
4. D


Question : You have been given below conceptual data model


And you have below Access pattern , which of the following is valid table design

where course_name=? and publish_date=?

 : You have been given below conceptual data model
1. A
2. B
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4. D


Question : As you know, in Cassandra tables, must have primary keys. For primary key, you can use either TimeUUID or UUID
only?
Which of the following you can say is a Timeuuid?

 : As you know, in Cassandra tables, must have primary keys. For primary key, you can use either TimeUUID or UUID
1. 52b11d6d-16e2-4ee2-b2a9-425861b86ab6

2. 1be43390-9fe4-11e3-8d05-425861b86ab6

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4. 1be43390-9fe4-31e3-8d05-425861b86ab6



Question : Which of the following is correct for TIMEUUID?



 : Which of the following is correct for TIMEUUID?
1. It is Sortable and can be used with time series data

2. Can be generated using now() function

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4. 1,2

5. 1,2 and 3



Question : Which of the following statement is true, with regards to Timestamp datatype in Cassandra?

A. Stores date and time
B. 64-bit integer
C. It represent Milliseconds since January 1 1970 at 00:00:00 GMT
D. Displayed in cqlsh as yyyy-mm-dd HH:mm:ssZ
E. As literal in cqlsh is '1979-07-24 08:30:15'

 : Which of the following statement is true, with regards to Timestamp datatype in Cassandra?
1. A,B,C
2. B,C,D
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4. A,D,E
5. A,B,C,D,E


Question : Does Cassandra capture microseconds with timestamp data type?
 : Does Cassandra capture microseconds with timestamp data type?
1. No
2. Yes