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Databricks Certified Data Engineer Associate Practice Test 20

Question 190

At Public transport authority, the streaming dedup and watermarks workflow handles fare validation events. The problem is that mobile fare_validation_events_east events arrive late and sometimes duplicate within an event-time window. Evidence: several event IDs reappear after an offline device reconnect. Constraint: the stream must remove duplicates without retaining infinite state. The first acceptance run passed. The current task is to detect future regressions and changes over time. Which monitoring approach will detect newly emerging defects?

  1. Retain every key forever in unbounded streaming state at Public transport authority
  2. Inject duplicate and late events and verify the defined retention tradeoff
  3. Deduplicate with stable event IDs and a bounded event-time watermark
  4. Monitor late-drop counts, state-store size and duplicate output for fare_validation_events_east

Explanation

Correct Answer

D:

Monitor late-drop counts, state-store size and duplicate output for fare_validation_events_east creates recurring visibility into the failure mode (mobile fare_validation_events_east events arrive late and sometimes duplicate within an event-time window). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while the stream must remove duplicates without retaining infinite state.

Incorrect Answers

A:

Unbounded state eventually destabilizes a long-running stream. The proposed action (Retain every key forever in unbounded streaming state at Public transport authority) does not meet the requirement that the stream must remove duplicates without retaining infinite state, nor does it constitute continuing operational detection.

B:

Inject duplicate and late events and verify the defined retention tradeoff is a one-time acceptance check. It does not supply continuing operational detection for fare_validation_events_east; a passing test cannot substitute for the specific task now required.

C:

Deduplicate with stable event IDs and a bounded event-time watermark is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the fare_validation_events_east scenario, the observed evidence is that several event IDs reappear after an offline device reconnect; the requirement remains: the stream must remove duplicates without retaining infinite state.

Question 191

Consider the consent_related_data_changes_delta workload at Research clinical trial group: joining consent_related_data_changes_delta fact records to a tiny reference table produces a large shuffle. Inspection found that Spark UI shows both inputs shuffled despite one lookup occupying a few megabytes. The governed outcome must ensure that join output must retain key equality and correct multiplicity. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. How should the team verify the original fault has been addressed?

  1. Compare join counts and stage shuffle bytes with and without the hint
  2. CrossJoin the entire fact and reference datasets then filter after collection at Research clinical trial group
  3. Review table sizes, statistics and shuffle metrics for consent_related_data_changes_delta
  4. Trial a broadcast hint with representative fact cardinality and verify output

Explanation

Correct Answer

A:

Compare join counts and stage shuffle bytes with and without the hint directly tests the behavior that should change after the correction. With the observed evidence (Spark UI shows both inputs shuffled despite one lookup occupying a few megabytes), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that join output must retain key equality and correct multiplicity.

Incorrect Answers

B:

A cartesian expansion wastes resources and risks mis-joins. The proposed action (CrossJoin the entire fact and reference datasets then filter after collection at Research clinical trial group) does not meet the requirement that join output must retain key equality and correct multiplicity, nor does it constitute the post-change acceptance test.

C:

Review table sizes, statistics and shuffle metrics for consent_related_data_changes_delta could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The consent_related_data_changes_delta workflow still requires that join output must retain key equality and correct multiplicity.

D:

Trial a broadcast hint with representative fact cardinality and verify output may introduce a correction, but the question does not ask for installation or migration. A rollout alone cannot replace the post-change acceptance test, especially given the evidence that Spark UI shows both inputs shuffled despite one lookup occupying a few megabytes.

Question 192

Consider the pipeline_flow_metrics_north workload at Public water district: pipeline_flow_metrics_north pipeline configuration exists only in one engineer's workspace UI. Inspection found that releasing to test requires manual reconstruction of tasks. The governed outcome must ensure that the same versioned workload definitions must deploy to multiple targets. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. Which staged rollout best preserves the existing workload?

  1. Package supported jobs and pipelines as Declarative Automation Bundle resources
  2. Compare deployed resource properties and run results to the approved bundle
  3. Recreate every task manually with different values in each environment at Public water district
  4. Deploy the versioned bundle to test then prod with approval and target-specific config

Explanation

Correct Answer

D:

Deploy the versioned bundle to test then prod with approval and target-specific config provides a bounded way to introduce the approved solution into pipeline_flow_metrics_north and detect an early mismatch. The existing signal is releasing to test requires manual reconstruction of tasks; a staged change protects the service requirement (the same versioned workload definitions must deploy to multiple targets) and makes rollback practical.

Incorrect Answers

A:

Package supported jobs and pipelines as Declarative Automation Bundle resources is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the pipeline_flow_metrics_north scenario, the observed evidence is that releasing to test requires manual reconstruction of tasks; the requirement remains: the same versioned workload definitions must deploy to multiple targets.

B:

Compare deployed resource properties and run results to the approved bundle is a one-time acceptance check. It does not supply the controlled implementation step for pipeline_flow_metrics_north; a passing test cannot substitute for the specific task now required.

C:

Manual recreation invites hidden differences and unreproducible releases. The proposed action (Recreate every task manually with different values in each environment at Public water district) does not meet the requirement that the same versioned workload definitions must deploy to multiple targets, nor does it constitute the controlled implementation step.

Question 193

The warehouse_movement_logs_west pipeline at Multinational parts distributor has this failure: warehouse_movement_logs_west analysts require a simple always-current projection without a stored refresh process. The team observed that a team proposes a materialized view even though the logic is just a lightweight filter. Business requirement: data access should reflect up-to-date table rows without unnecessary materialization cost. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. What should be done next to deploy the approved solution?

  1. Insert a source row and confirm view results reflect it on subsequent query
  2. Migrate the projection and validate granted access with representative users
  3. Use a standard governed view for low-cost logical projection rather than scheduled materialization
  4. Physically copy the entire source table every time a user opens a dashboard at Multinational parts distributor

Explanation

Correct Answer

B:

Migrate the projection and validate granted access with representative users provides a bounded way to introduce the approved solution into warehouse_movement_logs_west and detect an early mismatch. The existing signal is a team proposes a materialized view even though the logic is just a lightweight filter; a staged change protects the service requirement (data access should reflect up-to-date table rows without unnecessary materialization cost) and makes rollback practical.

Incorrect Answers

A:

Insert a source row and confirm view results reflect it on subsequent query is a one-time acceptance check. It does not supply the controlled implementation step for warehouse_movement_logs_west; a passing test cannot substitute for the specific task now required.

C:

Use a standard governed view for low-cost logical projection rather than scheduled materialization is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the warehouse_movement_logs_west scenario, the observed evidence is that a team proposes a materialized view even though the logic is just a lightweight filter; the requirement remains: data access should reflect up-to-date table rows without unnecessary materialization cost.

D:

Unnecessary full copies increase cost and stale-data risk. The proposed action (Physically copy the entire source table every time a user opens a dashboard at Multinational parts distributor) does not meet the requirement that data access should reflect up-to-date table rows without unnecessary materialization cost, nor does it constitute the controlled implementation step.

Question 194

The collection_telemetry_highland pipeline at Municipal waste service has this failure: collection_telemetry_highland executive dashboard refreshes before its gold dataset is updated. The team observed that job run graph has no edge from aggregation to dashboard refresh. Business requirement: dashboards must represent the latest committed daily snapshot. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. What test most directly proves the requirement is satisfied?

  1. Trace data dependencies and dashboard refresh timestamps for collection_telemetry_highland
  2. Configure dashboard refresh after the aggregation task with failure handling
  3. Change source data and verify dashboard refresh occurs after processing
  4. Refresh the dashboard before materializing the gold data at Municipal waste service

Explanation

Correct Answer

C:

Change source data and verify dashboard refresh occurs after processing directly tests the behavior that should change following the correction. With the observed evidence (job run graph has no edge from aggregation to dashboard refresh), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that dashboards must represent the latest committed daily snapshot.

Incorrect Answers

A:

Trace data dependencies and dashboard refresh timestamps for collection_telemetry_highland could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The collection_telemetry_highland workflow still requires that dashboards must represent the latest committed daily snapshot.

B:

Configure dashboard refresh following the aggregation task with failure handling may introduce a correction, but the question does not ask for installation or migration. A rollout alone cannot replace the post-change acceptance test, especially given the evidence that job run graph has no edge from aggregation to dashboard refresh.

D:

The dashboard would show stale results. The proposed action (Refresh the dashboard before materializing the gold data at Municipal waste service) does not meet the requirement that dashboards must represent the latest committed daily snapshot, nor does it constitute the post-change acceptance test.

Question 195

The station_observation_files_rural pipeline at Public weather agency has this failure: station_observation_files_rural validation notebook computes the partition date but downstream tasks use yesterday by default. The team observed that logs show successful validation for one date and export for another. Business requirement: the exported partition must match the validated partition. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. What should the engineer inspect to establish the failure mechanism?

  1. Add explicit task-value references and test with nondefault date
  2. Hardcode yesterday in every downstream task at Public weather agency
  3. Inspect taskValues producer, dependency and dynamic reference in station_observation_files_rural
  4. Pass a validated task value to the dependent export task

Explanation

Correct Answer

C:

Inspect taskValues producer, dependency and dynamic reference in station_observation_files_rural directly investigates the evidence (logs show successful validation for one date and export for another) and distinguishes possible causes of station_observation_files_rural validation notebook computes the partition date but downstream tasks use yesterday by default. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: the exported partition must match the validated partition.

Incorrect Answers

A:

Add explicit task-value references and test with nondefault date may introduce a correction, but the question does not ask for installation or migration. A rollout alone cannot replace the required pre-change investigation, especially given the evidence that logs show successful validation for one date and export for another. This matters here because the station_observation_files_rural pipeline at Public weather agency has this failure:….

B:

Hardcoded dates can diverge from validated data. The proposed action (Hardcode yesterday in every downstream task at Public weather agency) does not meet the requirement that the exported partition must match the validated partition, nor does it constitute the required pre-change investigation.

D:

Pass a validated task value to the dependent export task is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the station_observation_files_rural scenario, the observed evidence is that logs show successful validation for one date and export for another; the requirement remains: the exported partition must match the validated partition.

Question 196

The point_of_sale_receipts_east pipeline at International coffee retailer has this failure: the point_of_sale_receipts_east producer is a managed enterprise database but engineers plan a custom nightly file scraper. The team observed that evaluation finds supported managed CDC connector and tight freshness targets. Business requirement: data must reach Unity Catalog with near-real-time change capture. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. What should be done next to deploy the approved solution?

  1. Select Lakeflow Connect managed CDC rather than custom file snapshots where supported
  2. Use monthly manual CSV downloads for a near-real-time feed at International coffee retailer
  3. Pilot managed CDC for a bounded table before removing the nightly export
  4. Update and delete source rows and validate resulting Delta state

Explanation

Correct Answer

C:

Pilot managed CDC for a bounded table before removing the nightly export provides a bounded way to introduce the approved solution into point_of_sale_receipts_east and detect an early mismatch. The existing signal is evaluation finds supported managed CDC connector and tight freshness targets; a staged change protects the service requirement (data must reach Unity Catalog with near-real-time change capture) and makes rollback practical.

Incorrect Answers

A:

Select Lakeflow Connect managed CDC rather than custom file snapshots where supported is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the point_of_sale_receipts_east scenario, the observed evidence is that evaluation finds supported managed CDC connector and tight freshness targets; the requirement remains: data must reach Unity Catalog with near-real-time change capture.

B:

Manual batch exports cannot meet continuous change freshness. The proposed action (Use monthly manual CSV downloads for a near-real-time feed at International coffee retailer) does not meet the requirement that data must reach Unity Catalog with near-real-time change capture, nor does it constitute the controlled implementation step.

D:

Update and delete source rows and validate resulting Delta state is a one-time acceptance check. It does not supply the controlled implementation step for point_of_sale_receipts_east; a passing test cannot substitute for the specific task now required.

Question 197

Consider the product_sales_transactions_east workload at Online bicycle retailer: product_sales_transactions_east downstream transformation needs to run after its governed source table changes. Inspection found that the source updates irregularly while cron polling starts empty jobs. The governed outcome must ensure that data freshness should follow actual table changes rather than wall-clock guesses. The first acceptance run passed. The current task is to detect future regressions and changes over time. Which continuing signal best reveals recurrence or drift?

  1. Configure a table-update trigger tied to the supported source table
  2. Modify source and confirm downstream task runs only after detectable update
  3. Monitor trigger delivery, lag and disabled-source conditions for product_sales_transactions_east
  4. Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer

Explanation

Correct Answer

C:

Monitor trigger delivery, lag and disabled-source conditions for product_sales_transactions_east creates recurring visibility into the failure mode (product_sales_transactions_east downstream transformation needs to run after its governed source table changes). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while data freshness should follow actual table changes rather than wall-clock guesses.

Incorrect Answers

A:

Configure a table-update trigger tied to the supported source table is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the product_sales_transactions_east scenario, the observed evidence is that the source updates irregularly while cron polling starts empty jobs; the requirement remains: data freshness should follow actual table changes rather than wall-clock guesses.

B:

Modify source and confirm downstream task runs only after detectable update is a one-time acceptance check. It does not supply continuing operational detection for product_sales_transactions_east; a passing test cannot substitute for the specific task now required.

D:

Coarse polling cannot consistently meet data-driven freshness. The proposed action (Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer) does not meet the requirement that data freshness should follow actual table changes rather than wall-clock guesses, nor does it constitute continuing operational detection.

Question 198

Consider the consent_related_data_changes_west workload at Research clinical trial group: consent_related_data_changes_west dataset is shared between clouds and network charges surprise the data provider. Inspection found that billing shows recipient reads create cross-cloud data transfer. The governed outcome must ensure that sharing must meet cost and policy expectations. The failure and requirements have been diagnosed; the team must select the lasting pipeline or governance approach. Which data-engineering approach resolves the documented weakness?

  1. Design an approved sharing pattern accounting for network egress and access controls
  2. Assume cross-cloud data transfer is always free because sharing is read-only at Research clinical trial group
  3. Monitor recipient consumption and cross-cloud egress spikes for consent_related_data_changes_west
  4. Measure recipient location, data volumes and provider/recipient charge terms for consent_related_data_changes_west

Explanation

Correct Answer

A:

Design an approved sharing pattern accounting for network egress and access controls is the intended durable approach for consent_related_data_changes_west: it addresses the verified problem (consent_related_data_changes_west dataset is shared between clouds and network charges surprise the data provider) while preserving the required behavior (sharing must meet cost and policy expectations). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Read-only sharing can still incur network charges. The proposed action (Assume cross-cloud data transfer is always free because sharing is read-only at Research clinical trial group) does not meet the requirement that sharing must meet cost and policy expectations, nor does it constitute the target approach.

C:

Monitor recipient consumption and cross-cloud egress spikes for consent_related_data_changes_west would help detect future recurrence, but metrics alone do not deliver the target approach. The consent_related_data_changes_west requirement is that sharing must meet cost and policy expectations.

D:

Measure recipient location, data volumes and provider/recipient charge terms for consent_related_data_changes_west could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The consent_related_data_changes_west workflow still requires that sharing must meet cost and policy expectations.

Question 199

A data engineer at Coastal freight alliance is responsible for shipment manifests. The bundle run after deploy issue is that shipment_manifests_metro CI reports successful deployment even though its Lakeflow job has never executed. The supporting evidence is that the build log only shows resource creation, no job-run evidence. The engineer must ensure that release must demonstrate a working data pipeline, not just valid YAML. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. What is the safest migration or deployment sequence?

  1. Add a post-deployment smoke test and acceptance assertions to the CI pipeline
  2. Accept a successful YAML validation as proof the ETL output is correct at Coastal freight alliance
  3. Verify outputs, run status and affected catalog resources after deployment
  4. Execute a scoped smoke run after bundle deployment and capture its ID

Explanation

Correct Answer

D:

Execute a scoped smoke run after bundle deployment and capture its ID provides a bounded way to introduce the approved solution into shipment_manifests_metro and detect an early mismatch. The existing signal is the build log only shows resource creation, no job-run evidence; a staged change protects the service requirement (release must demonstrate a working data pipeline, not just valid YAML) and makes rollback practical.

Incorrect Answers

A:

Add a post-deployment smoke test and acceptance assertions to the CI pipeline is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the shipment_manifests_metro scenario, the observed evidence is that the build log only shows resource creation, no job-run evidence; the requirement remains: release must demonstrate a working data pipeline, not just valid YAML.

B:

Syntax validation cannot establish runtime data correctness. The proposed action (Accept a successful YAML validation as proof the ETL output is correct at Coastal freight alliance) does not meet the requirement that release must demonstrate a working data pipeline, not just valid YAML, nor does it constitute the controlled implementation step.

C:

Verify outputs, run status and affected catalog resources after deployment is a one-time acceptance check. It does not supply the controlled implementation step for shipment_manifests_metro; a passing test cannot substitute for the specific task now required.

Question 200

At Media postproduction team, the render-job telemetry workflow depends on render_job_telemetry_west. Engineers report that developers edit render_job_telemetry_west production notebooks directly and bypass code review; the evidence is that workspace Git history shows changes without a pull request. They require that releases need traceable approval and a recoverable commit. The first acceptance run passed. The current task is to detect future regressions and changes over time. Which ongoing alert or metric is most relevant?

  1. Develop in a feature branch with a reviewed pull request before merging
  2. Copy arbitrary notebook cells into production without a commit at Media postproduction team
  3. Monitor direct main-branch pushes and unreviewed notebook changes for render_job_telemetry_west
  4. Verify deployed code hash matches the approved merged commit

Explanation

Correct Answer

C:

Monitor direct main-branch pushes and unreviewed notebook changes for render_job_telemetry_west creates recurring visibility into the failure mode (developers edit render_job_telemetry_west production notebooks directly and bypass code review). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while releases need traceable approval and a recoverable commit.

Incorrect Answers

A:

Develop in a feature branch with a reviewed pull request before merging is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the render_job_telemetry_west scenario, the observed evidence is that workspace Git history shows changes without a pull request; the requirement remains: releases need traceable approval and a recoverable commit.

B:

Untracked copies cannot reliably reproduce the approved source. The proposed action (Copy arbitrary notebook cells into production without a commit at Media postproduction team) does not meet the requirement that releases need traceable approval and a recoverable commit, nor does it constitute continuing operational detection.

D:

Verify deployed code hash matches the approved merged commit is a one-time acceptance check. It does not supply continuing operational detection for render_job_telemetry_west; a passing test cannot substitute for the specific task now required.

Certified Data Engineer Associate Practice Tests