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NEW QUESTION 22
A data engineer is overwriting data in a table by deleting the table and recreating the table. Another data
engineer suggests that this is inefficient and the table should simply be overwritten instead.
Which of the following reasons to overwrite the table instead of deleting and recreating the table is incorrect?

A. Overwriting a table allows for concurrent queries to be completed while in progressB. Overwriting a table is an atomic operation and will not leave the table in an unfinished stateC. Overwriting a table maintains the old version of the table for Time TravelD. Overwriting a table results in a clean table history for logging and audit purposesE. Overwriting a table is efficient because no files need to be deleted

Answer: D

 

NEW QUESTION 23
A data engineer wants to create a relational object by pulling data from two tables. The relational object must
be used by other data engineers in other sessions. In order to save on storage costs, the data engineer wants to
avoid copying and storing physical data.
Which of the following relational objects should the data engineer create?

A. Temporary viewB. DatabaseC. Delta TableD. Spark SQL TableE. View

Answer: E

 

NEW QUESTION 24
A data engineering team needs to query a Delta table to extract rows that all meet the same condi-tion.
However, the team has noticed that the query is running slowly. The team has already tuned the size of the
data files. Upon investigating, the team has concluded that the rows meeting the condition are sparsely located
throughout each of the data files.
Based on the scenario, which of the following optimization techniques could speed up the query?

A. Data skippingB. Bin-packingC. Write as a Parquet fileD. Z-OrderingE. Tuning the file size

Answer: D

 

NEW QUESTION 25
A data engineer wants to horizontally combine two tables as a part of a query. They want to use a shared
column as a key column, and they only want the query result to contain rows whose value in the key column is
present in both tables.
Which of the following SQL commands can they use to accomplish this task?

A. UNIONB. INNER JOINC. LEFT JOIND. MERGEE. OUTER JOIN

Answer: B

 

NEW QUESTION 26
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