Free Access Databricks.Databricks-Certified-Professional-Data-Engineer.v2024-03-27.q76 Practice Test (Page 12)

Question 51

A table is registered with the following code:

Bothusersandordersare Delta Lake tables. Which statement describes the results of queryingrecent_orders?

A.All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query began.

B.All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query finishes.

C.All logic will execute when the table is defined and store the result of joining tables to the DBFS; this stored data will be returned when the table is queried.

D.The versions of each source table will be stored in the table transaction log; query results will be saved to DBFS with each query.

E.Results will be computed and cached when the table is defined; these cached results will incrementally update as new records are inserted into source tables.

Question 52

A small company based in the United States has recently contracted a consulting firm in India to implement several new data engineering pipelines to power artificial intelligence applications. All the company's data is stored in regional cloud storage in the United States.
The workspace administrator at the company is uncertain about where the Databricks workspace used by the contractors should be deployed.
Assuming that all data governance considerations are accounted for, which statement accurately informs this decision?

A.Databricks runs HDFS on cloud volume storage; as such, cloud virtual machines must be deployed in the region where the data is stored.

B.Databricks workspaces do not rely on any regional infrastructure; as such, the decision should be made based upon what is most convenient for the workspace administrator.

C.Cross-region reads and writes can incur significant costs and latency; whenever possible, compute should be deployed in the same region the data is stored.

D.Databricks leverages user workstations as the driver during interactive development; as such, users should always use a workspace deployed in a region they are physically near.

E.Databricks notebooks send all executable code from the user's browser to virtual machines over the open internet; whenever possible, choosing a workspace region near the end users is the most secure.

Question 53

A CHECK constraint has been successfully added to the Delta table named activity_details using the following logic:

A batch job is attempting to insert new records to the table, including a record where latitude = 45.50 and longitude = 212.67.
Which statement describes the outcome of this batch insert?

A.The write will fail when the violating record is reached; any records previously processed will be recorded to the target table.

B.The write will fail completely because of the constraint violation and no records will be inserted into the target table.

C.The write will insert all records except those that violate the table constraints; the violating records will be recorded to a quarantine table.

D.The write will include all records in the target table; any violations will be indicated in the boolean column named valid_coordinates.

E.The write will insert all records except those that violate the table constraints; the violating records will be reported in a warning log.

Question 54

Which of the following is a correct statement on how the data is organized in the storage when when managing a DELTA table?

A.All of the data is broken down into one or many parquet files, log files are broken down into one or many JSON files, and each transaction creates a new data file(s) and log file.
(Correct)

B.All of the data and log are stored in a single parquet file

C.All of the data is broken down into one or many parquet files, but the log file is stored as a single json file, and every transaction creates a new data file(s) and log file gets appended.

D.All of the data is broken down into one or many parquet files, log file is removed once the transaction is committed.

E.All of the data is stored into one parquet file, log files are broken down into one or many json files.

Question 55

A table nameduser_ltvis being used to create a view that will be used by data analysts on various teams. Users in the workspace are configured into groups, which are used for setting up data access using ACLs.
Theuser_ltvtable has the following schema:
email STRING, age INT, ltv INT
The following view definition is executed:

An analyst who is not a member of the marketing group executes the following query:
SELECT * FROM email_ltv
Which statement describes the results returned by this query?

A.Three columns will be returned, but one column will be named "redacted" and contain only null values.

B.Only the email and itv columns will be returned; the email column will contain all null values.

C.The email and ltv columns will be returned with the values in user itv.

D.The email, age. and ltv columns will be returned with the values in user ltv.

E.Only the email and ltv columns will be returned; the email column will contain the string
"REDACTED" in each row.

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Question 51

Question 52

Question 53

Question 54

Question 55

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