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Exam Certified Data Engineer Professional All Questions

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Exam Certified Data Engineer Professional topic 1 question 63 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 63
Topic #: 1
[All Certified Data Engineer Professional Questions]

A Databricks SQL dashboard has been configured to monitor the total number of records present in a collection of Delta Lake tables using the following query pattern:


SELECT COUNT (*) FROM table -

Which of the following describes how results are generated each time the dashboard is updated?

  • A. The total count of rows is calculated by scanning all data files
  • B. The total count of rows will be returned from cached results unless REFRESH is run
  • C. The total count of records is calculated from the Delta transaction logs
  • D. The total count of records is calculated from the parquet file metadata
  • E. The total count of records is calculated from the Hive metastore
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by sturcu at Oct. 24, 2023, 3:42 p.m.

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Ati1362
5 months ago
Selected Answer: C
Delta transaction log
upvoted 2 times
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sodere
11 months, 1 week ago
Selected Answer: C
Transaction log provides statistics about the delta table.
upvoted 4 times
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alexvno
11 months, 1 week ago
Selected Answer: C
C - transaction logs contains info about files rows count
upvoted 3 times
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aragorn_brego
1 year ago
Selected Answer: C
Delta Lake maintains a transaction log that records details about every change made to a table. When you execute a count operation on a Delta table, Delta Lake can use the information in the transaction log to calculate the total number of records without having to scan all the data files. This is because the transaction log includes information about the number of records in each file, allowing for an efficient aggregation of these counts to get the total number of records in the table.
upvoted 4 times
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Dileepvikram
1 year ago
The answer is C
upvoted 2 times
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PearApple
1 year ago
Selected Answer: C
The answer should be C
upvoted 2 times
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Syd
1 year ago
Answer C https://delta.io/blog/2023-04-19-faster-aggregations-metadata/#:~:text=You%20can%20get%20the%20number,a%20given%20Delta%20table%20version.
upvoted 3 times
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sturcu
1 year, 1 month ago
Selected Answer: C
total rows will be calculated from delta logs
upvoted 3 times
...

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