Cloudera HBase Certification Questions and Answers (Dumps and Practice Questions)

Question :

When you are designing a Column Families, so what makes you think for keeping the data in different column families

1. By Default each enity should be kept in different column family
2. Data that is not frequently accessed together should be kept in different Column Family
3. Data which used different compression methods
4. 1,2 and 3 are correct
5. Only 2 and 3 are correct




Correct Answer : 5


Explanation: Separate column families are useful for
Data that is not frequently accessed together
Data that uses different column family options e.g. compression





Question :

Select the correct option for HBase table

1. Physically stored on a per-column family basis.
2. Empty cells are not stored
3. Each cell has a timestamp
4. Multiple version of a cell can exist
5. All of the above



Correct Answer : 5

HBase tables are
Physically stored on a per-column family basis
Empty cells are not stored
Each cell has a timestamp
Multiple versions of a row can exist







Question :

When HBase is compared with RDBMS then which statement is true.

1. HBase automatically partitions data in regions
2. HBase does not support explicit joins
3. A lookup by row key implicitly joins data from column families if necessary
4. All of the above
Solution : 15


Correct Answer : 4

Comparison with RDBMS design

Scaling relation tables often means partitioning or sharding data
HBase automatically partitions data in regions
In relational databases, one might normalize tables and use joins to retrieve data
HBase does not support explicit joins
A lookup by row key implicitly joins data from column families if necessary

Related Questions

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Question : Please select the wrong statement regarding the Version delete

1. Deleting all the versions older than a certain timestamp can be
performed on a row, column family or a column
2. Delete version at a specific timestamp and can only be performed
on a column
3. For deletion if not timestamp is specified currentTimeMillis is
used
4. For deletion if not timestamp is specified all the versions will
be deleted


Question : Which command in HBase shell you will use to list all user
tables

1. all tables
2. list
3. describe "Column Family Name"
4. status



Question : Which of the following syntex is correct to create t table
undre fam1

1. create 't1', {NAME => 'fam1'}
2. create 't1', {NAME => 'fam1', VERSIONS => 1}
3. create 't1', 'fam1'
4. All of the above





Question : Only Column Families must be created at schema definition time

1. True
2. False



Question : Which of the following is the correct syntex for getting the

data from HBase table t1 and rowkey r1


1. get 't1', 'r1'
2. get 't1', 'r1', {COLUMN => 'fam1:c1'}
3. get 't1', 'r1', {COLUMN => 'fam1:c1', VERSIONS=> 2}
4. All of the above



Question : Which statement is wrong about HBase

1. Tables can have thousands of columns
2. It is not mendatory to have dat data in all the columns
3. It does not support transaction
4. All of the above
5. None of the above