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



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


Correct Answer : Get Lastest Questions and Answer :
Explanation: now()
In the coordinator node, generates a new unique timeuuid in milliseconds when the statement is executed. The timestamp portion
of the timeuuid conforms to the UTC (Universal Time) standard. This method is useful for inserting values. The value returned
by now() is guaranteed to be unique.

UUID and TIMEUUID are stored the same way in Cassandra, and they only really represent two different sorting implementations.





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

Correct Answer : Get Lastest Questions and Answer :
Explanation: Values for the timestamp type are encoded as 64-bit signed integers representing a number of
milliseconds since the standard base time known as the epoch: January 1 1970 at 00:00:00 GMT. Enter a timestamp type as an
integer for CQL input, or as a string literal in any of the following ISO 8601 formats:

yyyy-mm-dd HH:mm
yyyy-mm-dd HH:mm:ss
yyyy-mm-dd HH:mmZ
yyyy-mm-dd HH:mm:ssZ
yyyy-mm-dd'T'HH:mm
yyyy-mm-dd'T'HH:mmZ
yyyy-mm-dd'T'HH:mm:ss
yyyy-mm-dd'T'HH:mm:ssZ
yyyy-mm-dd'T'HH:mm:ss.ffffffZ
yyyy-mm-dd
yyyy-mm-ddZ





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

Correct Answer : Get Lastest Questions and Answer :
Explanation: Microseconds no, milliseconds yes.


Related 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

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4. It could be either Entity or Relationship



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


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


Question : . You must define Constraint types in a conceptual data model?
 : . You must define Constraint types in a conceptual data model?
1. True
2. False


Question : In conceptual data modeling Attribute types can be

A. key
B. composite
C. multi-valued
D. A and C
E. A,B and C

 : In conceptual data modeling Attribute types can be
1. key

2. composite

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4. 1 and 3

5. 1,2 and 3



Question : In Cassandra, you will design tables based on Query ?
 : In Cassandra, you will design tables based on Query ?
1. True
2. False