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Databricks-Certified-Professional-Data-Engineer Dumps With Exact Questions and Answers

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

Question # 1

A Delta table of weather records is partitioned by date and has the below schema:

date DATE, device_id INT, temp FLOAT, latitude FLOAT, longitude FLOAT

To find all the records from within the Arctic Circle, you execute a query with the below filter:

latitude > 66.3

Which statement describes how the Delta engine identifies which files to load?

A.

All records are cached to an operational database and then the filter is applied

B.

The Parquet file footers are scanned for min and max statistics for the latitude column

C.

All records are cached to attached storage and then the filter is applied

D.

The Delta log is scanned for min and max statistics for the latitude column

E.

The Hive metastore is scanned for min and max statistics for the latitude column

Question # 2

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?

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.

Question # 3

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 finishes.

B.

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.

C.

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.

D.

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.

E.

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

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