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Databricks Exam Databricks Certified Data Engineer Professional Topic 2 Question 36 Discussion

Actual exam question for Databricks's Databricks Certified Data Engineer Professional exam
Question #: 36
Topic #: 2
[All Databricks Certified Data Engineer Professional Questions]

A Delta Lake table representing metadata about content posts from users has the following schema:

user_id LONG, post_text STRING, post_id STRING, longitude FLOAT, latitude FLOAT, post_time TIMESTAMP, date DATE

This table is partitioned by the date column. A query is run with the following filter:

longitude < 20 & longitude > -20

Which statement describes how data will be filtered?

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Suggested Answer: D

This is the correct answer because it describes how data will be filtered when a query is run with the following filter: longitude < 20 & longitude > -20. The query is run on a Delta Lake table that has the following schema: user_id LONG, post_text STRING, post_id STRING, longitude FLOAT, latitude FLOAT, post_time TIMESTAMP, date DATE. This table is partitioned by the date column. When a query is run on a partitioned Delta Lake table, Delta Lake uses statistics in the Delta Log to identify data files that might include records in the filtered range. The statistics include information such as min and max values for each column in each data file. By using these statistics, Delta Lake can skip reading data files that do not match the filter condition, which can improve query performance and reduce I/O costs. Verified Reference: [Databricks Certified Data Engineer Professional], under ''Delta Lake'' section; Databricks Documentation, under ''Data skipping'' section.


Contribute your Thoughts:

Sarah
2 days ago
I think option D is the correct answer. The Delta Log contains statistics that can be used to identify the relevant data files for the filter.
upvoted 0 times
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Jaime
3 days ago
I think the answer is D.
upvoted 0 times
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