CRUD operations in HBase in Hadoop - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does CRUD stand for in the context of HBase?

CRUD stands for Create, Read, Update, and Delete. These are the basic operations to manage data in HBase tables.

beginner

How do you create a new table in HBase?

You create a table in HBase using the HBase shell command: <br>create 'table_name', 'column_family'<br>This sets up a table with the specified column family.

beginner

Which HBase shell command is used to insert or update data in a table?

The put command is used to insert or update data. Example:<br>put 'table_name', 'row_key', 'column_family:qualifier', 'value'

beginner

How do you read data from an HBase table?

You use the get command to read data for a specific row:<br>get 'table_name', 'row_key'<br>Or use scan 'table_name' to read multiple rows.

beginner

What command deletes data or tables in HBase?

To delete a row or cell, use:<br>delete 'table_name', 'row_key', 'column_family:qualifier'<br>To delete a whole table:<br>disable 'table_name'<br>drop 'table_name'

Which command creates a new table in HBase?

A create 'table_name', 'column_family'

B put 'table_name', 'row_key', 'column_family:qualifier', 'value'

C get 'table_name', 'row_key'

D delete 'table_name', 'row_key', 'column_family:qualifier'

The 'create' command is used to make a new table with a column family.

What does the 'put' command do in HBase?

A Deletes data

B Creates a table

C Reads data

D Inserts or updates data

The 'put' command inserts new data or updates existing data in a table.

How do you read a single row from an HBase table?

A scan 'table_name'

B delete 'table_name', 'row_key'

C get 'table_name', 'row_key'

D put 'table_name', 'row_key', 'column_family:qualifier', 'value'

The 'get' command retrieves data for a specific row key.

Which commands are needed to delete a table in HBase?

A delete 'table_name'

B disable 'table_name' and drop 'table_name'

C put 'table_name', 'row_key', 'column_family:qualifier', 'value'

D get 'table_name', 'row_key'

You must first disable the table, then drop it to delete it.

What is the purpose of the 'delete' command in HBase?

A Remove data from a row or cell

B Insert data

C Create a new table

D Read data

The 'delete' command removes data from a specific row or cell.

Explain the steps and commands to perform CRUD operations in HBase.

Think about how you manage data in a spreadsheet: add, view, change, and remove.

Describe how you would delete a specific cell value and then remove the entire table in HBase.

Deleting a table is a two-step process after deleting data.