Databricks Certified Data Engineer Professional Practice Test

DCDEP test Format | Course Contents | Course Outline | test Syllabus | test Objectives

Exam Code: DCDEP
Exam Name: Databricks Certified Data Engineer Professional
Type: Proctored certification
Total number of questions: 60
Time limit: 120 minutes
Question types: Multiple choice

Section 1: Databricks Tooling
- Explain how Delta Lake uses the transaction log and cloud object storage to guarantee atomicity and durability
- Describe how Delta Lake’s Optimistic Concurrency Control provides isolation- and which transactions might conflict
- Describe basic functionality of Delta clone.
- Apply common Delta Lake indexing optimizations including partitioning- zorder- bloom filters- and file sizes
- Implement Delta tables optimized for Databricks SQL service
- Contrast different strategies for partitioning data (e.g. identify proper partitioning columns to use)

Section 2: Data Processing (Batch processing- Incremental processing- and Optimization)
- Describe and distinguish partition hints: coalesce- repartition- repartition by range- and rebalance
- Contrast different strategies for partitioning data (e.g. identify proper partitioning columns to use)
- Articulate how to write Pyspark dataframes to disk while manually controlling the size of individual part-files.
- Articulate multiple strategies for updating 1+ records in a spark table (Type 1)
- Implement common design patterns unlocked by Structured Streaming and Delta Lake.
- Explore and tune state information using stream-static joins and Delta Lake
- Implement stream-static joins
- Implement necessary logic for deduplication using Spark Structured Streaming
- Enable CDF on Delta Lake tables and re-design data processing steps to process CDC output instead of incremental feed from normal Structured Streaming read
- Leverage CDF to easily propagate deletes
- Demonstrate how proper partitioning of data allows for simple archiving or deletion of data
- Articulate- how “smalls” (tiny files- scanning overhead- over partitioning- etc) induce performance problems into Spark queries

Section 3: Data Modeling
- Describe the objective of data transformations during promotion from bronze to silver
- Discuss how Change Data Feed (CDF) addresses past difficulties propagating updates and deletes within Lakehouse architecture
- Apply Delta Lake clone to learn how shallow and deep clone interact with source/target tables.
- Design a multiplex bronze table to avoid common pitfalls when trying to productionalize streaming workloads.
- Implement best practices when streaming data from multiplex bronze tables.
- Apply incremental processing- quality enforcement- and deduplication to process data from bronze to silver
- Make informed decisions about how to enforce data quality based on strengths and limitations of various approaches in Delta Lake
- Implement tables avoiding issues caused by lack of foreign key constraints
- Add constraints to Delta Lake tables to prevent bad data from being written
- Implement lookup tables and describe the trade-offs for normalized data models
- Diagram architectures and operations necessary to implement various Slowly Changing Dimension tables using Delta Lake with streaming and batch workloads.
- Implement SCD Type 0- 1- and 2 tables

Section 4: Security & Governance
- Create Dynamic views to perform data masking
- Use dynamic views to control access to rows and columns

Section 5: Monitoring & Logging
- Describe the elements in the Spark UI to aid in performance analysis- application debugging- and tuning of Spark applications.
- Inspect event timelines and metrics for stages and jobs performed on a cluster
- Draw conclusions from information presented in the Spark UI- Ganglia UI- and the Cluster UI to assess performance problems and debug failing applications.
- Design systems that control for cost and latency SLAs for production streaming jobs.
- Deploy and monitor streaming and batch jobs

Section 6: Testing & Deployment
- Adapt a notebook dependency pattern to use Python file dependencies
- Adapt Python code maintained as Wheels to direct imports using relative paths
- Repair and rerun failed jobs
- Create Jobs based on common use cases and patterns
- Create a multi-task job with multiple dependencies
- Design systems that control for cost and latency SLAs for production streaming jobs.
- Configure the Databricks CLI and execute basic commands to interact with the workspace and clusters.
- Execute commands from the CLI to deploy and monitor Databricks jobs.
- Use REST API to clone a job- trigger a run- and export the run output

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Question: 524
Objective: Assess the impact of a MERGE operation on a Delta Lake table
A Delta Lake table prod.customers has columns customer_id, name, and last_updated. A
data engineer runs the following MERGE operation to update records from a source
DataFrame updates_df:
MERGE INTO prod.customers AS target
USING updates_df AS source
ON target.customer_id = source.customer_id
WHEN MATCHED THEN UPDATE SET
name = source.name,
last_updated = source.last_updated
WHEN NOT MATCHED THEN INSERT
(customer_id, name, last_updated)
VALUES
(source.customer_id, source.name, source.last_updated)
If updates_df contains a row with customer_id = 100, but prod.customers has multiple
rows with customer_id = 100, what happens?
A. The operation succeeds, updating all matching rows with the same values.
B. The operation fails due to duplicate customer_id values in the target.
C. The operation skips the row with customer_id = 100.
D. The operation inserts a new row for customer_id = 100.
E. The operation updates only the first matching row.
Answer: B
Explanation: Delta Lake�s MERGE operation requires that the ON condition matches at
most one row in the target table for each source row. If multiple rows in prod.customers
match customer_id = 100, the operation fails with an error indicating ambiguous matches.
Question: 525
A data engineer enables Change Data Feed (CDF) on a Delta table orders to propagate
changes to a target table orders_sync. The CDF is enabled at version 12, and the pipeline
processes updates and deletes. Which query correctly applies CDC changes?
A. spark.readStream.option("readChangeFeed", "true").option("startingVersion",
12).table("orders").writeStream.outputMode("append").table("orders_sync")
B. spark.readStream.option("readChangeFeed", "true").option("startingVersion",
12).table("orders").groupBy("order_id").agg(max("amount")).writeStream.outputMode("append").table("orders_sync")
C. spark.read.option("readChangeFeed",
"true").table("orders").writeStream.outputMode("update").table("orders_sync")
D. spark.readStream.option("readChangeFeed",
"true").table("orders").writeStream.outputMode("complete").table("orders_sync")
E. spark.readStream.option("readChangeFeed", "true").option("startingVersion",
12).table("orders").writeStream.foreachBatch(lambda batch, id: spark.sql("MERGE
INTO orders_sync USING batch ON orders_sync.order_id = batch.order_id WHEN
MATCHED AND batch._change_type = 'update' THEN UPDATE SET * WHEN
MATCHED AND batch._change_type = 'delete' THEN DELETE WHEN NOT
MATCHED AND batch._change_type = 'insert' THEN INSERT *"))
Answer: E
Explanation: CDF processing uses spark.readStream.option("readChangeFeed", "true")
with startingVersion set to 12. The foreachBatch method with a MERGE statement
applies inserts, updates, and deletes based on _change_type.
Question: 526
A data engineer is analyzing a Spark job that processes a 1TB Delta table using a cluster
with 8 worker nodes, each with 16 cores and 64GB memory. The job involves a complex
join operation followed by an aggregation. In the Spark UI, the SQL/DataFrame tab
shows a query plan with a SortMergeJoin operation taking 80% of the total execution
time. The Stages tab indicates one stage has 200 tasks, but 10 tasks are taking
significantly longer, with high GC Time and Shuffle Write metrics. Which optimization
should the engineer prioritize to reduce execution time?
A. Increase the number of worker nodes to 16 to distribute tasks more evenly
B. Set spark.sql.shuffle.partitions to 400 to increase parallelism
C. Enable Adaptive Query Execution (AQE) with spark.sql.adaptive.enabled=true
D. Increase spark.executor.memory to 128GB to reduce garbage collection
E. Use OPTIMIZE and ZORDER on the Delta table to Strengthen data skipping
Answer: C
Explanation: The high execution time of the SortMergeJoin and skewed tasks with high
GC Time and Shuffle Write suggest data skew and shuffle bottlenecks. Enabling
Adaptive Query Execution (AQE) with spark.sql.adaptive.enabled=true allows Spark to
dynamically adjust the number of partitions, optimize join strategies, and handle skew by
coalescing small partitions or splitting large ones. This is more effective than increasing
nodes (which increases costs without addressing skew), changing shuffle partitions
manually (which may not address skew dynamically), increasing memory (which may
not solve shuffle issues), or using OPTIMIZE and ZORDER (which improves data
skipping but not join performance directly).
Question: 527
A data engineer is deduplicating a streaming DataFrame orders with columns order_id,
customer_id, and event_time. Duplicates occur within a 10-minute window. The
deduplicated stream should be written to a Delta table orders_deduped in append mode.
Which code is correct?
A. orders.dropDuplicates("order_id").withWatermark("event_time", "10
minutes").writeStream.outputMode("append").table("orders_deduped")
B. orders.dropDuplicates("order_id",
"event_time").writeStream.outputMode("append").table("orders_deduped")
C. orders.withWatermark("event_time", "10
minutes").groupBy("order_id").agg(max("event_time")).writeStream.outputMode("complete").table("orders_deduped")
D. orders.withWatermark("event_time", "10
minutes").dropDuplicates("order_id").writeStream.outputMode("append").table("orders_deduped")
E. orders.withWatermark("event_time", "10
minutes").distinct().writeStream.outputMode("update").table("orders_deduped")
Answer: D
Explanation: Deduplication requires withWatermark("event_time", "10 minutes")
followed by dropDuplicates("order_id") to remove duplicates within the 10-minute
window. The append mode writes deduplicated records to the Delta table.
Question: 528
A data engineer is optimizing a Delta table logs with 1 billion rows, partitioned by
log_date. Queries filter by log_type and user_id. The engineer runs OPTIMIZE logs
ZORDER BY (log_type, user_id) but notices minimal performance improvement. What
is the most likely cause?
A. The table is too large for Z-ordering
B. The table is not vacuumed
C. log_type and user_id have low cardinality
D. Z-ordering is not supported on partitioned tables
Answer: C
Explanation: Z-ordering is less effective for low-cardinality columns like log_type and
user_id, as it cannot efficiently co-locate data. Table size doesn�t prevent Z-ordering.
Vacuuming removes old files but doesn�t affect Z-ordering. Z-ordering is supported on
partitioned tables.
Question: 529
A Delta Lake table logs_data with columns log_id, device_id, timestamp, and event is
partitioned by timestamp (year-month). Queries filter on event and timestamp ranges.
Performance is poor due to small files. Which command optimizes the table?
A. OPTIMIZE logs_data ZORDER BY (event, timestamp)
B. ALTER TABLE logs_data SET TBLPROPERTIES ('delta.targetFileSize' = '512MB')
C. REPARTITION logs_data BY (event)
D. OPTIMIZE logs_data PARTITION BY (event, timestamp)
E. VACUUM logs_data RETAIN 168 HOURS
Answer: A
Explanation: Running OPTIMIZE logs_data ZORDER BY (event, timestamp) compacts
small files and applies Z-order indexing on event and timestamp, optimizing data
skipping for queries.
Question: 530
A data engineer creates a deep clone of a Delta table, source_employees, to
target_employees_clone using CREATE TABLE target_employees_clone DEEP CLONE
source_employees. The source table has a check constraint salary > 0. The engineer
updates the target table with UPDATE target_employees_clone SET salary = -100
WHERE employee_id = 1. What happens?
A. The update fails because deep clones reference the source table�s constraints
B. The update succeeds because deep clones do not inherit check constraints
C. The update succeeds but logs a warning about the constraint violation
D. The update fails because the check constraint is copied to the target table
E. The update requires disabling the constraint on the target table first
Answer: D
Explanation: A deep clone copies both data and metadata, including check constraints
like salary > 0. The UPDATE operation on the target table (target_employees_clone)
violates this constraint, causing the operation to fail. Deep clones are independent, so
constraints are not referenced from the source but are enforced on the target. No warnings
are logged, and disabling constraints is not required unless explicitly done.
Question: 531
A dynamic view on the Delta table employee_data (emp_id, name, salary, dept) must
mask salary as NULL for non-hr members and restrict rows to dept = 'HR' for non-
manager members. The view must be optimized for a Unity Catalog-enabled workspace.
Which SQL statement is correct?
A. CREATE VIEW emp_view AS SELECT emp_id, WHEN is_member('hr') THEN
salary ELSE NULL END AS salary, name, dept FROM employee_data WHERE
is_member('manager') OR dept = 'HR';
B. CREATE VIEW emp_view AS SELECT emp_id, IF(is_member('hr'), NULL, salary)
AS salary, name, dept FROM employee_data WHERE dept = 'HR' OR
is_member('manager');
C. CREATE VIEW emp_view AS SELECT emp_id, MASK(salary, 'hr') AS salary,
name, dept FROM employee_data WHERE dept = 'HR' AND NOT
is_member('manager');
D. CREATE VIEW emp_view AS SELECT emp_id, COALESCE(is_member('hr'),
salary, NULL) AS salary, name, dept FROM employee_data WHERE dept = 'HR';
E. CREATE VIEW emp_view AS SELECT emp_id, CASE WHEN is_member('hr')
THEN salary ELSE NULL END AS salary, name, dept FROM employee_data WHERE
CASE WHEN is_member('manager') THEN TRUE ELSE dept = 'HR' END;
Answer: E
Explanation: The view must mask salary and restrict rows in a Unity Catalog-enabled
workspace. The first option uses CASE statements correctly. The second option reverses
the masking logic. The third option uses a non-existent MASK function. The fourth
option misuses COALESCE. The fifth option has a syntax error with WHEN.
Question: 532
A data engineer is deduplicating a streaming DataFrame events with columns event_id,
user_id, and timestamp. Duplicates occur within a 20-minute window. The deduplicated
stream should be written to a Delta table events_deduped in append mode. Which code is
correct?
A. events.dropDuplicates("event_id").withWatermark("timestamp", "20
minutes").writeStream.outputMode("append").table("events_deduped")
B. events.withWatermark("timestamp", "20
minutes").dropDuplicates("event_id").writeStream.outputMode("append").table("events_deduped")
C. events.withWatermark("timestamp", "20
minutes").groupBy("event_id").agg(max("timestamp")).writeStream.outputMode("complete").table("events_deduped")
D. events.dropDuplicates("event_id",
"timestamp").writeStream.outputMode("append").table("events_deduped")
E. events.withWatermark("timestamp", "20
minutes").distinct().writeStream.outputMode("update").table("events_deduped")
Answer: B
Explanation: Deduplication requires withWatermark("timestamp", "20 minutes")
followed by dropDuplicates("event_id") to remove duplicates within the 20-minute
window. The append mode writes deduplicated records to the Delta table.
Question: 533
A Databricks job failed in Task 5 due to a data quality issue in a Delta table. The task
uses a Python file importing a Wheel-based module quality_checks. The team refactors to
use /Repos/project/checks/quality_checks.py. How should the engineer repair the task
and refactor the import?
A. Run OPTIMIZE, rerun the job, and import using import sys; sys.path.append("/Repos/
project/checks")
B. Use FSCK REPAIR TABLE, repair Task 5, and import using from
checks.quality_checks import *
C. Delete the Delta table, rerun Task 5, and import using from /Repos/project/checks/
quality_checks import *
D. Use the Jobs API to reset the job, and import using from ..checks.quality_checks
import *
E. Clone the job, increase cluster size, and import using from checks import
quality_checks
Answer: B
Explanation: Using FSCK REPAIR TABLE addresses data quality issues in the Delta
table, and repairing Task 5 via the UI targets the failure. The correct import is from
checks.quality_checks import *. Running OPTIMIZE doesn�t fix data quality. Deleting
the table causes data loss. Resetting or cloning the job is unnecessary. Double-dot or
incorrect package imports fail.
Question: 534
A data engineer is implementing a streaming pipeline that processes IoT data with
columns device_id, timestamp, and value. The pipeline must detect anomalies where
value exceeds 100 for more than 5 minutes. Which code block achieves this?
A. df = spark.readStream.table("iot_data") \
.withWatermark("timestamp", "5 minutes") \
.groupBy("device_id", window("timestamp", "5 minutes")) \
.agg(max("value").alias("max_value")) \
.filter("max_value > 100") \
.writeStream \
.outputMode("update") \
.start()
B. df = spark.readStream.table("iot_data") \
.withWatermark("timestamp", "5 minutes") \
.groupBy("device_id", window("timestamp", "5 minutes")) \
.agg(max("value").alias("max_value")) \
.filter("max_value > 100") \
.writeStream \
.outputMode("append") \
.start()
C. df = spark.readStream.table("iot_data") \
.groupBy("device_id", window("timestamp", "5 minutes")) \
.agg(max("value").alias("max_value")) \
.filter("max_value > 100") \
.writeStream \
.outputMode("complete") \
.start()
D. df = spark.readStream.table("iot_data") \
.withWatermark("timestamp", "5 minutes") \
.filter("value > 100") \
.groupBy("device_id", window("timestamp", "5 minutes")) \
.count() \
.writeStream \
.outputMode("append") \
.start()
Answer: A
Explanation: Detecting anomalies requires aggregating max(value) over a 5-minute
window and filtering for max_value > 100. The update mode outputs only updated
aggregates, suitable for anomaly detection. append mode is invalid for aggregations.
complete mode is inefficient for streaming.
Question: 535
Objective: Evaluate the behavior of a streaming query with watermarking
A streaming query processes a Delta table stream_logs with the following code:
spark.readStream
.format("delta")
.table("stream_logs")
.withWatermark("event_time", "10 minutes")
.groupBy(window("event_time", "5 minutes"))
.count()
If a late event arrives 15 minutes after its event_time, what happens?
A. The event is included in the current window and processed.
B. The event is buffered until the next trigger.
C. The event is processed in a new window.
D. The query fails due to late data.
E. The event is dropped due to the watermark.
Answer: E
Explanation: The withWatermark("event_time", "10 minutes") setting discards events
that arrive more than 10 minutes late. A 15-minute-late event is dropped and not included
in any window.
Question: 536
A streaming pipeline processes user activity into an SCD Type 2 Delta table with
columns user_id, activity, start_date, end_date, and is_current. The stream delivers
user_id, activity, and event_timestamp. Which code handles intra-batch duplicates and
late data?
A. MERGE INTO activity t USING (SELECT user_id, activity, event_timestamp FROM
source WHERE event_timestamp > (SELECT MAX(end_datA. FROM activity)) s ON
t.user_id = s.user_id AND t.is_current = true WHEN MATCHED AND t.activity !=
s.activity THEN UPDATE SET t.is_current = false, t.end_date = s.event_timestamp
WHEN NOT MATCHED THEN INSERT (user_id, activity, start_date, end_date,
is_current) VALUES (s.user_id, s.activity, s.event_timestamp, null, true)
B. MERGE INTO activity t USING source s ON t.user_id = s.user_id WHEN
MATCHED THEN UPDATE SET t.activity = s.activity, t.start_date = s.event_timestamp
WHEN NOT MATCHED THEN INSERT (user_id, activity, start_date, end_date,
is_current) VALUES (s.user_id, s.activity, s.event_timestamp, null, true)
C.
spark.readStream.table("source").writeStream.format("delta").option("checkpointLocation",
"/checkpoints/activity").outputMode("append").table("activity")
D.
spark.readStream.table("source").groupBy("user_id").agg(max("activity").alias("activity"),
max("event_timestamp").alias("start_date")).writeStream.format("delta").option("checkpointLocation",
"/checkpoints/activity").outputMode("complete").table("activity")
E. spark.readStream.table("source").withWatermark("event_timestamp", "30
minutes").dropDuplicates("user_id",
"event_timestamp").writeStream.format("delta").option("checkpointLocation",
"/checkpoints/activity").outputMode("append").table("activity")
Answer: A
Explanation: SCD Type 2 requires maintaining historical records, and streaming pipelines
must handle intra-batch duplicates and late data. The MERGE operation filters source
records to include only those with event_timestamp greater than the maximum end_date,
ensuring late data is processed correctly. It matches on user_id and is_current, updating
the current record to inactive and setting end_date if the activity differs, then inserts new
records. Watermarking with dropDuplicates alone risks losing history, append mode
without MERGE does not handle updates, and complete mode is inefficient. A simple
MERGE without timestamp filtering mishandles late data.
Question: 537
A data engineer is tasked with securing a Delta table sensitive_data containing personally
identifiable information (PII). The table must be accessible only to users in the
data_analysts group with SELECT privileges, and all operations must be logged. Which
combination of SQL commands achieves this?
A. GRANT SELECT ON TABLE sensitive_data TO data_analysts;
SET TBLPROPERTIES ('delta.enableChangeDataFeed' = 'true');
B. GRANT SELECT ON TABLE sensitive_data TO data_analysts;
ALTER TABLE sensitive_data SET TBLPROPERTIES ('delta.enableAuditLog' = 'true');
C. GRANT READ ON TABLE sensitive_data TO data_analysts;
ALTER TABLE sensitive_data ENABLE AUDIT LOG;
D. GRANT SELECT ON TABLE sensitive_data TO data_analysts;
ALTER TABLE sensitive_data SET TBLPROPERTIES ('audit_log' = 'true');
Answer: B
Explanation: GRANT SELECT assigns read-only access to the data_analysts group.
Enabling audit logging requires setting the Delta table property delta.enableAuditLog to
true using ALTER TABLE ... SET TBLPROPERTIES.
Question: 538
A Delta Lake table transactions has columns tx_id, account_id, and amount. The team
wants to ensure amount is not null and greater than 0. Which command enforces this?
A. ALTER TABLE transactions ADD CONSTRAINT positive_amount CHECK (amount
> 0 AND amount IS NOT NULL)
B. ALTER TABLE transactions MODIFY amount NOT NULL, ADD CONSTRAINT
positive_amount CHECK (amount > 0)
C. ALTER TABLE transactions SET amount NOT NULL, CONSTRAINT
positive_amount CHECK (amount > 0)
D. CREATE CONSTRAINT positive_amount ON transactions CHECK (amount > 0
AND amount IS NOT NULL)
E. ALTER TABLE transactions MODIFY amount CHECK (amount > 0) NOT NULL
Answer: B
Explanation: The correct syntax is ALTER TABLE transactions MODIFY amount NOT
NULL, ADD CONSTRAINT positive_amount CHECK (amount > 0), applying both
constraints separately.
Question: 539
A data engineering team is automating cluster management using the Databricks CLI.
They need to create a cluster with 4 workers, a specific runtime (13.3.x-scala2.12), and
auto-termination after 60 minutes. The command must use a profile named
AUTO_PROFILE. Which command correctly creates this cluster?
A. databricks clusters create --profile AUTO_PROFILE --name auto-cluster --workers 4
--runtime 13.3.x-scala2.12 --auto-terminate 60
B. databricks clusters create --json '{"cluster_name": "auto-cluster", "num_workers": 4,
"spark_version": "13.3.x-scala2.12", "autotermination_minutes": 60}' --profile
AUTO_PROFILE
C. databricks clusters start --json '{"cluster_name": "auto-cluster", "num_workers": 4,
"spark_version": "13.3.x-scala2.12", "autotermination_minutes": 60}' --profile
AUTO_PROFILE
D. databricks clusters create --profile AUTO_PROFILE --cluster-name auto-cluster --
num-workers 4 --version 13.3.x-scala2.12 --terminate-after 60
E. databricks clusters configure --profile AUTO_PROFILE --cluster auto-cluster --
workers 4 --spark-version 13.3.x-scala2.12 --auto-termination 60
Answer: B
Explanation: The databricks clusters create command requires a JSON specification for
cluster configuration when using the --json flag. The correct command is databricks
clusters create --json '{"cluster_name": "auto-cluster", "num_workers": 4,
"spark_version": "13.3.x-scala2.12", "autotermination_minutes": 60}' --profile
AUTO_PROFILE. This specifies the cluster name, number of workers, Spark runtime
version, and auto-termination period. Other options are incorrect: B and D use invalid
flags (--workers, --runtime, --name, --version, --terminate-after); C uses start instead of
create, which is for existing clusters; E uses an invalid configure command.
Question: 540
A data engineer needs to import a notebook from a local file (/local/notebook.py) to a
workspace path (/Users/user/new_notebook) using the CLI with profile
IMPORT_PROFILE. Which command achieves this?
A. databricks workspace copy /local/notebook.py /Users/user/new_notebook --profile
IMPORT_PROFILE
B. databricks notebook import /local/notebook.py /Users/user/new_notebook --profile
IMPORT_PROFILE
C. databricks workspace upload /local/notebook.py /Users/user/new_notebook --profile
IMPORT_PROFILE
D. databricks workspace import /local/notebook.py /Users/user/new_notebook --profile
IMPORT_PROFILE
E. databricks notebook push /local/notebook.py /Users/user/new_notebook --profile
IMPORT_PROFILE
Answer: D
Explanation: The databricks workspace import command imports a local file to a
workspace path. The correct command is databricks workspace import /local/notebook.py
/Users/user/new_notebook --profile IMPORT_PROFILE. Other options are incorrect: B,
D, and E use invalid commands (notebook import, workspace copy, notebook push); C
uses an invalid workspace upload command.
Question: 541
A streaming pipeline propagates deletes from a Delta table orders to orders_history using
CDF. The pipeline fails due to high latency during peak hours. Which configuration
improves performance?
A. Run OPTIMIZE orders ZORDER BY order_id daily
B. Use spark.readStream.option("maxFilesPerTrigger", 1000).table("orders")
C. Increase spark.sql.shuffle.partitions to 1000
D. Set spark.databricks.delta.optimize.maxFileSize = 512MB
E. Disable CDF and use a batch MERGE INTO operation
Answer: B
Explanation: High latency in a CDF streaming pipeline during peak hours can result from
processing too many files. Setting spark.readStream.option("maxFilesPerTrigger", 1000)
limits the number of files processed per micro-batch, controlling latency. OPTIMIZE
helps batch performance but not streaming, maxFileSize requires OPTIMIZE, increasing
shuffle partitions increases overhead, and disabling CDF defeats the purpose.
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I recently came across killexams.com, and I must say it is by far the best IT test practice platform I have ever used. I had no issues passing my DCDEP test with remarkable ease. The questions were not only accurate, but they were also structured in a way that mirrored how DCDEP conducts the real exam, making it effortless to retain the answers in my memory. Although not all the questions were 100% identical, most of them were highly similar, making it easy to sort them out. This platform is exceptionally useful, especially for dedicated IT professionals like myself.
Martha nods [2026-4-25]


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Lee [2026-6-20]

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