Exam Certified Data Engineer Professional topic 1 question 59 discussion

Actual exam question from Databricks's Certified Data Engineer Professional

Question #: 59
Topic #: 1

[All Certified Data Engineer Professional Questions]

A Delta Lake table was created with the below query:

Realizing that the original query had a typographical error, the below code was executed:
ALTER TABLE prod.sales_by_stor RENAME TO prod.sales_by_store
Which result will occur after running the second command?

A. The table reference in the metastore is updated and no data is changed.
B. The table name change is recorded in the Delta transaction log.
C. All related files and metadata are dropped and recreated in a single ACID transaction.
D. The table reference in the metastore is updated and all data files are moved.
E. A new Delta transaction log Is created for the renamed table.

Show Suggested Answer

Suggested Answer: A 🗳️

by adenis at Jan. 30, 2024, 12:26 p.m.

Comments

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hal2401me

Highly Voted 9 months, 2 weeks ago

Selected Answer: A

did a test. No data is changed. dir & filename not changed. the rename is not recorded in transition log neither.

upvoted 8 times

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KadELbied

Most Recent 1 month, 1 week ago

Selected Answer: A

suretly A

upvoted 1 times

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Tamele001

9 months, 2 weeks ago

B is the correct answer. When you alter a table name in Delta Lake, the change is logged in the transaction log that Delta Lake uses to maintain a versioned history of all changes to the table. This is how Delta Lake maintains ACID properties and ensures a consistent view of the data. The transaction log is key to supporting features like time travel, auditing, and rollbacks in Delta Lake. The metadata and the actual data remain intact, and the reference to the table in the metastore is updated to reflect the new name.

upvoted 2 times

arekm

5 months, 2 weeks ago

Transaction log captures operations on the data (including adding columns, renaming them). This operation is a change of the name of the external table - just a change in the metastore.

upvoted 1 times

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adenis

10 months, 3 weeks ago

Selected Answer: A

A is Correct

upvoted 4 times

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