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Databricks Databricks-Certified-Professional-Data-Engineer Exam Dumps Questions and Answers

Exam Code: Databricks-Certified-Professional-Data-Engineer
Certification: Databricks Certification
Vendor: Databricks
Last Update: Dec 4, 2024
Questions: 120 With Expert Explanation
10  Customers Passed Databricks Databricks-Certified-Professional-Data-Engineer
87%  Average Success In Real Exam
89%  Questions came word by word from this dump
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Databricks Certified Data Engineer Professional Exam Questions and Answers

Questions 1

A data engineer is configuring a pipeline that will potentially see late-arriving, duplicate records.

In addition to de-duplicating records within the batch, which of the following approaches allows the data engineer to deduplicate data against previously processed records as it is inserted into a Delta table?

Options:

A.

Set the configuration delta.deduplicate = true.

B.

VACUUM the Delta table after each batch completes.

C.

Perform an insert-only merge with a matching condition on a unique key.

D.

Perform a full outer join on a unique key and overwrite existing data.

E.

Rely on Delta Lake schema enforcement to prevent duplicate records.

Questions 2

The data governance team is reviewing user for deleting records for compliance with GDPR. The following logic has been implemented to propagate deleted requests from the user_lookup table to the user aggregate table.

Assuming that user_id is a unique identifying key and that all users have requested deletion have been removed from the user_lookup table, which statement describes whether successfully executing the above logic guarantees that the records to be deleted from the user_aggregates table are no longer accessible and why?

Options:

A.

No: files containing deleted records may still be accessible with time travel until a BACUM command is used to remove invalidated data files.

B.

Yes: Delta Lake ACID guarantees provide assurance that the DELETE command successed fully and permanently purged these records.

C.

No: the change data feed only tracks inserts and updates not deleted records.

D.

No: the Delta Lake DELETE command only provides ACID guarantees when combined with the MERGE INTO command

Questions 3

A data ingestion task requires a one-TB JSON dataset to be written out to Parquet with a target part-file size of 512 MB. Because Parquet is being used instead of Delta Lake, built-in file-sizing features such as Auto-Optimize & Auto-Compaction cannot be used.

Which strategy will yield the best performance without shuffling data?

Options:

A.

Set spark.sql.files.maxPartitionBytes to 512 MB, ingest the data, execute the narrow transformations, and then write to parquet.

B.

Set spark.sql.shuffle.partitions to 2,048 partitions (1TB*1024*1024/512), ingest the data, execute the narrow transformations, optimize the data by sorting it (which automatically repartitions the data), and then write to parquet.

C.

Set spark.sql.adaptive.advisoryPartitionSizeInBytes to 512 MB bytes, ingest the data, execute the narrow transformations, coalesce to 2,048 partitions (1TB*1024*1024/512), and then write to parquet.

D.

Ingest the data, execute the narrow transformations, repartition to 2,048 partitions (1TB* 1024*1024/512), and then write to parquet.

E.

Set spark.sql.shuffle.partitions to 512, ingest the data, execute the narrow transformations, and then write to parquet.

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