DataStax Cassandra Developer Certification Certification Questions and Answer (Dumps and Practice Questions)
Question : You have a query with the where clause and all the predicates use equality operator like =, != etc.
What is correct in this scenario, with regards to mapping rule?
1. search attributes, which are used in a query predicate, map to the prefix columns of a table primary key.
2. Such columns must include all partition key columns and, optionally, one or more clustering key columns.
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4. 1 and 2
5. 2 and 3
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Explanation: MR2 (Equality Search Attributes). Equality search attributes,
which are used in a query predicate, map to the prefix
columns of a table primary key. Such columns must include all
partition key columns and, optionally, one or more clustering
key columns. Violation of this rule may result in inability to
support query requirements.
Question : Which of the following is correct with regards to mapping rule Inequality Search Attributes
1. An inequality search attribute, which is used in a query predicate, maps to a table clustering key column.
2. In the primary key definition, a column that participates in inequality search must follow columns that
participate in equality search.
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4. 1 and 2
5. 1,2 and 3
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Explanation: MR3 (Inequality Search Attributes). An inequality search attribute, which is used in a query
predicate, maps to a table
clustering key column. In the primary key definition, a column
that participates in inequality search must follow columns that
participate in equality search. Violation of this rule may result
in inability to support query requirements.
Question : You have a query, where you have to order by the data by a particular column. In this case you have to use this
column with the clustering key?
1. True
2. False
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Explanation: MR4 (Ordering Attributes). Ordering attributes, which are
specified in a query, map to clustering key columns with
ascending or descending clustering order as prescribed by the
query. Violation of this rule may result in inability to support
query requirements.
Related Questions
Question : You have defined a table name HadoopExam with three columns Course_id, Course_title and course_description.
However, you want to introduce a new column to this table named Course_price. Which of the following will help you do this?
1. ALTER
2. REPLACE
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4. Not possible
Question : Which All are the Cassandra column type?
1. LIST<>
2. SET<>
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4. DICTIONARY<>
Question : Which of the following Collection type is supported by Cassandra table definition
1. list
2. list
4. 1 and 2
5. 1,2 and 3
Question : Which of the following collection types are not supported for creating index in Cassandra table definition
1. map
2. set
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4. 1,2 and 3
5. None of the above
Question : Which of the following is correct statement?
A. A frozen value serializes multiple components into a single value.
B. Non-frozen types allow updates to individual fields.
C. Apache Cassandra treats the value of a frozen type as a blob
D. You cannot use non-frozen collections for primary key columns.
1. A,B,C
2. B,C,D
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4. A,B,D
5. A,B,C,D
Question : NetworkTopologyStrategy is recommended for most deployments because it is much easier to expand to multiple data
centers when required by future expansion.
1. True
2. False