Multiple choice technology databases

Which one the following occurs when the extract phase of the ETL is going on

  1. Data is collected from multiple data sources

  2. Data is loaded into data warehouse

  3. Meta data is built

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The E (Extract) phase of ETL is where data is collected from multiple source systems - databases, files, APIs, logs, etc. The T (Transform) phase cleans and converts this data. The L (Load) phase writes it to the data warehouse, so options B and C are incorrect for the extract phase.

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