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DA0-001 · Question #119
DA0-001 Question #119: Real Exam Question with Answer & Explanation
The correct answer is C: Transform.. In an ETL process, R programming skills are most relevant in the Transform phase where data is cleaned, manipulated, and prepared for the data warehouse.
Data Analysis
Question
Mario works with a group of R programmers tasked with copying data from an accounting system into a data warehouse. In what phase are the group's R skills most relevant?
Options
- AExtract.
- BLoad.
- CTransform.
- DPurge.
Explanation
In an ETL process, R programming skills are most relevant in the Transform phase where data is cleaned, manipulated, and prepared for the data warehouse.
Common mistakes.
- A. The Extract phase focuses on retrieving data from source systems, which typically involves connectors or scripts to pull raw data, not extensive R programming.
- B. The Load phase involves inserting the transformed data into the data warehouse, which often uses database-specific utilities or scripts for efficient bulk loading, rather than R's primary strengths.
- D. Purge is not a standard phase in the core ETL process; it refers to deleting old or unwanted data, which is a maintenance task rather than a core data integration step.
Concept tested. ETL process phases
Reference. https://en.wikipedia.org/wiki/Extract,_transform,_load
Topics
#ETL#Data Transformation#R Programming#Data Warehousing
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