CCB-400 Online Practice Questions and Answers

The cells in a given row have versions that range from 1000 to 2000. You execute a delete specifying the value 3000 for the version. What is the outcome?

A. The delete fails with an error.

B. Only cells equal to the Specified version are deleted.

C. The entire row is deleted.

D. Nothing in the row is deleted.

Given that following is your entire dataset:

100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase How many sets of physical files will be read during a scan of the entire dataset immediately following a major compaction?

A. Two

B. One

C. Three

D. Four

Your client application needs to scan s region for the row key value 104.

Given a store that contains the following list of Row Key values:

100, 101, 102, 103, 104, 105, 106, 107

A bloom filter would return which of the following?

A. Confirmation that 104 may becontained in theset

B. Confirmation that 104 is contained in the set

C. Thehash of column family

D. The file offset of the value 104

Given the following dataset:

100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase How many store files will be contained in your region(s) immediately following a major compaction?

A. Four

B. Three

C. Two

D. One

Given the following HBase table schema:

Row Key, colFam_A:a, colFam_A:b, colFamB:2, colFam_B:10

A table scan will return the column data in which of the following sorted orders:

A. Row Key, colFam_A:a, colFam__A:b, colFam_B:10, colFam_B:2

B. Row Key, colFam_A:a, colFam__A:b,colFam_B:2, colFam_B:10

C. Row Key, colFam_A:a, colFam__B:2, colFam_A:b, colFam_B:10

D. Row Key, colFam_A:a, colFam__B:10, colFam_A:b, colFam_B:2

You have two tables in existing RDBMS. One contains information about the products you sell (name, size, color, etc.) The other contains images of the products in JPEG format. These tables are frequently joined in queries to your database.

You would like to move this data into HBase.

How would you design the schema?

A. Create two tables each with multiple column families

B. Create two tables each with a single column family

C. Createasingle table with two column families

D. Create a single table with one column family

Given that the following is your entire dataset:

100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase

How many regions will be read during a scan of the entire dataset?

A. Four

B. Two

C. One

D. Three

Given the following HBase dataset, which is labeled with row numbers. . .

Row # ROW KEY COLUMN+CELL 1 BB002 Column=Comments:C_Author, timestamp=001, value=Diana Mears 2 BB002 Column=Comments:C_Title, timestamp=001, value=Thanks 3 BB001 Column=INFO:Title, timestamp=005, value=HBsase+Hadoop 4 BB001 Column=INFO:Author,timestamp=005,value=Lars George 5 BB002 Column=Comments:C_Text, timestamp=001, value=Any tips on ... 6 BB001 Column=INFO:Text, timestamp=005, value=Some of the ...

Which of the following lists of row numbers is the correct order that HBase would store this data?

A. 1, 5, 2, 4, 3, 6

B. 4, 1, 2, 6, 3, 5

C. 4, 6, 3, 1, 5, 2

D. 3, 4, 6, 1, 2, 5

You want to do mostly full table scans on your data. In order to improve performance you increase your block size. Why does this improve your scan performance?

A. It does not. Increasing block size does not improve scan performance.

B. It does not. Increasing block size means that fewer blocks fit into your block cache. This requires HBase to read each block from disk rather than cache for each scan, thereby decreasing scan performance.

C. Increasing block size requires HBase to readfrom disk fewer times, thereby increasing scan performance.

D. Increasing block size means fewer block indexes that need to be read from disk, therebyincreasing scan performance.

Your client application connects to HBase for the first time and queries the .META. table. What information does the .META. table provide to your client application?

A. The location of a Region

B. The location ofan MMaster

C. The location of aZooKeeper

D. The location of a璕OOT璽able