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Author Question: HDFS allows indexing which specifically allows applications real-time access to the data. ... (Read 66 times)

jrubin

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on: Jul 7, 2018
HDFS allows indexing which specifically allows applications real-time access to the data.
 
  Indicate whether the statement is true or false

Question 2

Discuss the ETL process.
 
  What will be an ideal response?


kishoreddi

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Reply #1 on: Jul 7, 2018
Answer to Question 1

FALSE

Answer to Question 2

The goal of the ETL process is data reconciliation. This data reconciliation occurs in two stages: when the data is initially loaded and when updates occur. There are five steps to the process of reconciliation (called the ETL process):
1. Mapping and metadata managementhere the data needed for the warehouse are mapped back to the data in the operational system.
2. Extractin this step, we capture any relevant data from the source system.
3. Cleansein this step, the data are cleansed so that things such as misspelled names, duplicate data, etc. are removed.
4. Load and Indexhere the cleansed data are loaded into the data warehouse and appropriate indexes are created.


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