Databricks Data Engineer Associate exam dumps

Databricks Data Engineer Associate practice question 330 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 330

Select 3

You are working on a Delta Lake table in Databricks. The table is used to store daily sales data, and you need to update it with new data. You are considering whether to use CREATE OR REPLACE TABLE or INSERT OVERWRITE. Which of the following statements accurately describe the differences between these two operations?

  1. A

    CREATE OR REPLACE TABLE will drop and recreate the table, removing all existing data and metadata.

  2. B

    Using INSERT OVERWRITE allows you to preserve the table schema while replacing data in specific partitions or the entire table.

  3. C

    CREATE OR REPLACE TABLE is more efficient than INSERT OVERWRITE for updating large tables because it avoids scanning existing data.

  4. D

    INSERT OVERWRITE cannot be used with Delta Lake tables.

  5. E

    CREATE OR REPLACE TABLE is typically used for creating a new table or resetting an existing table, whereas INSERT OVERWRITE is used to modify data within the existing table.

Show answer and explanation

Correct answers: A, B, E

Explanation

CREATE OR REPLACE TABLE and INSERT OVERWRITE have distinct purposes. CREATE OR REPLACE TABLE is destructive, as it deletes the existing table and metadata before recreating it. This is typically used when starting fresh. On the other hand, INSERT OVERWRITE is non-destructive to the table schema and allows for data replacement within the table (or specific partitions). Understanding these differences is essential for choosing the right operation for your use case.

  • A. Correct.

    Correct: CREATE OR REPLACE TABLE drops the existing table and recreates it, removing all current data and metadata.

  • B. Correct.

    Correct: INSERT OVERWRITE allows you to keep the table structure intact while replacing data, either in specific partitions or the entire table.

  • C. Incorrect.

    Incorrect: While CREATE OR REPLACE TABLE can be used to reset a table, it is not necessarily more efficient than INSERT OVERWRITE for updates. Efficiency depends on the specific use case and data size.

  • D. Incorrect.

    Incorrect: INSERT OVERWRITE is fully supported with Delta Lake tables, and it can be used for partitioned or non-partitioned tables.

  • E. Correct.

    Correct: CREATE OR REPLACE TABLE is used for creating or resetting a table, while INSERT OVERWRITE is used to replace the data without recreating the table.

Timed practice exam

Take a Databricks Data Engineer Associate practice test under exam conditions

45 questions in 90 minutes, drawn from this bank, with a score report and a per-question review when you finish.

Start timed exam

More Databricks Data Engineer Associate practice questions

  1. 331.You are working on a Databricks project where you need to update an existing table with the latest...
  2. 332.You are working on a Databricks project where you need to refresh a Delta table with new data from...
  3. 333.You are working with a Delta Lake table that stores customer data, and you receive a daily feed...
  4. 334.A retail company maintains a Delta Lake table to track inventory levels for all its products. The...
  5. 335.You are working with a Delta table in Databricks that stores user account information. A new...
Back to the Databricks Data Engineer Associate exam dumps