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Databricks Certified Data Engineer Professional Sample Questions:

1. A Structured Streaming job deployed to production has been experiencing delays during peak hours of the day. At present, during normal execution, each microbatch of data is processed in less than 3 seconds. During peak hours of the day, execution time for each microbatch becomes very inconsistent, sometimes exceeding 30 seconds. The streaming write is currently configured with a trigger interval of 10 seconds.
Holding all other variables constant and assuming records need to be processed in less than 10 seconds, which adjustment will meet the requirement?

A) Decrease the trigger interval to 5 seconds; triggering batches more frequently allows idle executors to begin processing the next batch while longer running tasks from previous batches finish.
B) Decrease the trigger interval to 5 seconds; triggering batches more frequently may prevent records from backing up and large batches from causing spill.
C) Use the trigger once option and configure a Databricks job to execute the query every 10 seconds; this ensures all backlogged records are processed with each batch.
D) The trigger interval cannot be modified without modifying the checkpoint directory; to maintain the current stream state, increase the number of shuffle partitions to maximize parallelism.
E) Increase the trigger interval to 30 seconds; setting the trigger interval near the maximum execution time observed for each batch is always best practice to ensure no records are dropped.

2. The data governance team has instituted a requirement that all tables containing Personal Identifiable Information (PH) must be clearly annotated. This includes adding column comments, table comments, and setting the custom table property "contains_pii" = true.
The following SQL DDL statement is executed to create a new table:
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Which command allows manual confirmation that these three requirements have been met?

A) SHOW TBLPROPERTIES dev.pii test
B) DESCRIBE EXTENDED dev.pii test
C) SHOW TABLES dev
D) DESCRIBE HISTORY dev.pii test
E) DESCRIBE DETAIL dev.pii test

3. A Delta Lake table representing metadata about content posts from users has the following schema:
user_id LONG, post_text STRING, post_id STRING, longitude FLOAT,
latitude FLOAT, post_time TIMESTAMP, date DATE
This table is partitioned by the date column. A query is run with the following filter:
longitude < 20 & longitude > -20
Which statement describes how data will be filtered?

A) No file skipping will occur because the optimizer does not know the relationship between the partition column and the longitude.
B) Statistics in the Delta Log will be used to identify partitions that might Include files in the filtered range.
C) Statistics in the Delta Log will be used to identify data files that might include records in the filtered range.
D) The Delta Engine will scan the parquet file footers to identify each row that meets the filter criteria.
E) The Delta Engine will use row-level statistics in the transaction log to identify the flies that meet the filter criteria.

4. Which statement characterizes the general programming model used by Spark Structured Streaming?

A) Structured Streaming is implemented as a messaging bus and is derived from Apache Kafka.
B) Structured Streaming leverages the parallel processing of GPUs to achieve highly parallel data throughput.
C) Structured Streaming models new data arriving in a data stream as new rows appended to an unbounded table.
D) Structured Streaming relies on a distributed network of nodes that hold incremental state values for cached stages.
E) Structured Streaming uses specialized hardware and I/O streams to achieve sub-second latency for data transfer.

5. A developer has successfully configured credential for Databricks Repos and cloned a remote Git repository. Hey don not have privileges to make changes to the main branch, which is the only branch currently visible in their workspace.
Use Response to pull changes from the remote Git repository commit and push changes to a branch that appeared as a changes were pulled.

A) Use repos to create a fork of the remote repository commit all changes and make a pull request on the source repository
B) Use repos to merge all difference and make a pull request back to the remote repository.
C) Use Repos to merge all differences and make a pull request back to the remote repository.
D) Use Repos to pull changes from the remote Git repository; commit and push changes to a branch that appeared as changes were pulled.
E) Use Repos to create a new branch commit all changes and push changes to the remote Git repertory.
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