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

Question : While querying the data from Cassandra table, you must be aware about the table partition keys. Which of the
below is correct with regards to partition key?

1. Cassandra will take keys and then find the hash value of that the key to determine which node the
partition resides on

2. Partition keys dynamically generate primary indexes on table

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4. Partition keys add secondary index to Cassandra table


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Explanation:




Question : In Cassandra table, number of columns can vary in different rows?

1. True
2. False

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Explanation: In Cassandra a table can have number of rows. Each row is referenced by a primary key also called row
key. There are number of columns in a row but the number of columns can vary in different rows.
For example one row in a table can have three columns whereas the other row in the same table can have ten columns.





Question : In Cassandra both column names and values have binary types

1. True
2. False

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Explanation: In Cassandra a table can have number of rows. Each row is referenced by a primary key also called row
key. There are number of columns in a row but the number of columns can vary in different rows.
For example one row in a table can have three columns whereas the other row in the same table can have ten columns. It is also
important to note that in Cassandra both column names and values have binary types. Which means column names can have binary
values such as string, timestamp or an integer etc. This is different from SQL databases where each row in an SQL table has
fixed number of columns and column names can only be text.

Related Questions

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Question : Entities and relationships, equality search attributes, inequality search attributes, ordering attributes, key
attributes. Is the correct order of mapping rule?

1. True
2. False


Question : Static columns are stored only once per partition?

1. True
2. False


Question : Which is true with regards to Cassandra partition size

1. One of the measure of partition size are the number of values in a partition

2. One of the measure of partition size is partition size on disk

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4. 1 and 2

5. 1,2 and 3


Question : . If you have data duplicated across the various tables in Cassandra. Consistency is the Cassandra's
responsibility. So you update the record in one table, it will be propagated across all the tables in same Keyspace to
maintain the consistency?

1. True
2. False


Question : Which of the following will help in maintaining the consistency in Cassandra nodes

1. stored procedures

2. transactions

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4. logged batch



Question : . Which of the following is correct with regards to batch in Cassandra?

1. Batches are written to a log on a coordinator node.

2. Replicas will take over if the coordinator node fails mid-batch.

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4. 1 and 3

5. 1,2,3