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

Question : Which is the correct statemnet to inserting the data in table

t1 and row key r1 and column family fam1


1. put 't1', 'r1', 'fam1:c1', 'value'
2. put 't1', 'r1', 'fam1:c1', 'value', 1274302629663
3. 1 and 2 are correct

Correct Answer : 3

Syntex put 'tablename', 'rowkey', 'colfam:col',

'value' [,timestamp]
put 't1', 'r1', 'fam1:c1', 'value'
put 't1', 'r1', 'fam1:c1', 'value', 1274302629663






Question : Which is the wrong syntex for scan


1. scan 't1'
2. scan 't1', {COLUMNS => 'fam1:c1'}
3. scan 't1', {COLUMNS => 'fam1:'}
4. scan 't1', {STARTROW => 'r1', LIMIT => 10}
5. scan 't1', {COLUMNS => ':c1'}


Correct Answer : 5

Explanation :

Explanation: scan 'tablename' [,{options}] May include options for

COLUMNS, START or STOP ROW, TIMESTAMP or COLUMNS
scan 't1'
scan 't1', {COLUMNS => 'fam1:c1'}
scan 't1', {COLUMNS => 'fam1:'}
scan 't1', {STARTROW => 'r1', LIMIT => 10}






Question :

Which of the following is a wrong statement abount count

operation on HBase table

1. Syntex for count is count 'tablename' [, interval]
2. Counting the rows of a large table can be slow
3. The progress will be reported every interval
4. None of the 1,2 and 3
5. Only 1 and 2




Correct Answer : 4

Regarding count syntex
count 'tablename' [, interval]
valid query
count 't1'
count 't1', 5000

Counting the rows of a large table can be slow!
The progress will be reported every interval

Related Questions

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Question : Select the correct statement for Block Cache



1. Block is normally 64K
2. Default is 20% of RegionServer Heap
3. Access Mostly Uused Products by 50000+ Subscribers
4. Only 1 and 3 are correct
5. All 1,2 and 3 arec correct


Question : The __________ is required for crash recovery if the MemStore is lost

1. HLog
2. Store
3. Access Mostly Uused Products by 50000+ Subscribers


Question : When the MemStore gets to a certain size, it will flush to an immutable file (Store file)


1. true
2. false



Question : Which is correct for the Data Storage concept in Hbase


1. Data is written to the Regions MemStore
2. When the MemStore gets to a certain size, it will flush to an immutable file (Store file)
3. Access Mostly Uused Products by 50000+ Subscribers
4. All of the above



Question : In the minor compactation...


1. Combines some store files in a Single file
2. Runs after three store files have accumulated
3. Access Mostly Uused Products by 50000+ Subscribers
4. All 1,2 and 3 are correct
5. Only 1 and 2 are correct




Question : Major compaction ......


1. Reads all the Store files and writes to a single Store
2. Deleted rows and expired versions are removed
3. Access Mostly Uused Products by 50000+ Subscribers
4. None of the 1,2 and 3 are correct
5. All 1,2 and 3 are correct