Databricks Data Engineer Associate exam dumps

Databricks Data Engineer Associate practice question 300 of 532

Databricks Certified Data Engineer Associate. Associate level, Databricks. Free question with the correct answer and a full explanation.

Databricks Data Engineer Associate Question 300

Select 3

A data engineer is working with Delta Tables in a Databricks workspace and needs to clean up old data files that are no longer needed after updates and deletions. They execute the VACUUM command on the Delta Table. Which of the following statements accurately describe how the VACUUM command commits deletes?

  1. A

    The VACUUM command permanently deletes files that are older than the retention threshold.

  2. B

    The VACUUM command can delete data files even if they are referenced by active Delta Table versions.

  3. C

    The retention threshold for VACUUM is set by default to 7 days.

  4. D

    Running the VACUUM command creates a new version of the Delta Table.

  5. E

    The VACUUM command only removes files that are no longer referenced by any Delta Table version.

Show answer and explanation

Correct answers: A, C, E

Explanation

The VACUUM command in Delta Lake is used to clean up old, unreferenced data files based on a retention threshold. It ensures that only files no longer referenced by any version of the Delta Table are permanently deleted. The default retention threshold is 7 days, which protects against accidental deletion of recent changes. VACUUM does not create a new Delta Table version, as its primary focus is on file cleanup and storage optimization.

  • A. Correct.

    Correct: The VACUUM command permanently deletes files that are older than the retention threshold, effectively committing deletes.

  • B. Incorrect.

    Incorrect: The VACUUM command does not delete data files that are still referenced by active Delta Table versions, ensuring data consistency.

  • C. Correct.

    Correct: By default, the retention threshold for VACUUM is set to 7 days to provide a safety buffer to prevent accidental data loss.

  • D. Incorrect.

    Incorrect: Running the VACUUM command does not create a new version of the Delta Table. It only cleans up older, unreferenced files.

  • E. Correct.

    Correct: The VACUUM command only removes data files that are no longer referenced by any version of the Delta Table, ensuring no active data is removed.

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More Databricks Data Engineer Associate practice questions

  1. 301.You are managing a Delta Lake table in Databricks, and you have recently deleted a large number of...
  2. 302.You are working on a Delta Lake table in Databricks that has undergone multiple delete operations....
  3. 303.When using Delta Lake's OPTIMIZE command, which type of files does it compact?
  4. 304.In a Databricks Delta table, which type of files are compacted by the OPTIMIZE command?
  5. 305.In Databricks, which kinds of files does the OPTIMIZE command compact when used on a Delta table?
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