CompTIA Data+ (DA0-002)Data MiningEasy
A data engineer is designing an ETL process for a new data warehouse. They have identified several source systems, each with its own schema and data types. Before loading the data into the target warehouse, the engineer needs to ensure that all incoming data conforms to a predefined set of rules and data formats to maintain data quality and consistency. Which of the following phases of the ETL process is primarily responsible for this activity?
- AExtraction
- BAcquisition
- CTransformation
- DLoading
Show answer & explanationAnswer & explanation
Correct answer: C. Transformation
The transformation phase in ETL is where data is cleaned, standardized, and converted into the format required for the target system. This ensures data quality and consistency before loading.
Why the other options are wrong
- A. Extraction is the process of retrieving data from source systems.
- B. Acquisition is a broader term encompassing the entire process of obtaining data, not a specific ETL phase.
- D. Loading is the process of writing the transformed data into the target data warehouse.
ETL Transformation
The phase in an ETL process where raw data is converted, cleansed, and aggregated into the desired format for analysis and storage.
- Occurs between extraction and loading.
- Ensures data quality and consistency.
- Involves data cleansing, standardization, and aggregation.
Memory trick: Every Tidy Loader ensures data is ready.