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Databricks Certified Data Engineer Associate Practice Test 80

Question 790

At Public transport authority, the JDBC watermark extraction workflow handles fare validation events. The problem is that the fare_validation_events_rural SQL source is polled hourly but every run extracts its entire ten-year table. Evidence: source query logs show full scans despite an indexed updated_at column. Constraint: new and changed rows must load with a replay-safe high-water mark. The failure and requirements have been diagnosed; the team must select the lasting pipeline or governance approach. What governed target implementation should the engineer design?

  1. Verify update timestamp semantics, primary keys and late-arrival window for fare_validation_events_rural
  2. Advance the stored watermark before persisting the extracted batch at Public transport authority
  3. Monitor watermark gaps, source query cost and late records for fare_validation_events_rural
  4. Use bounded incremental JDBC reads with a persisted watermark and merge keys

Explanation

Correct Answer

D:

Use bounded incremental JDBC reads with a persisted watermark and merge keys is the intended durable approach for fare_validation_events_rural: it addresses the verified problem (the fare_validation_events_rural SQL source is polled hourly but every run extracts its entire ten-year table) while preserving the required behavior (new and changed rows must load with a replay-safe high-water mark). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Verify update timestamp semantics, primary keys and late-arrival window for fare_validation_events_rural could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The fare_validation_events_rural workflow still requires that new and changed rows must load with a replay-safe high-water mark.

B:

Premature watermark advancement can lose rows on failure. The proposed action (Advance the stored watermark before persisting the extracted batch at Public transport authority) does not meet the requirement that new and changed rows must load with a replay-safe high-water mark, nor does it constitute the target approach.

C:

Monitor watermark gaps, source query cost and late records for fare_validation_events_rural would help detect future recurrence, but metrics alone do not deliver the target approach. The fare_validation_events_rural requirement is that new and changed rows must load with a replay-safe high-water mark.

Question 791

A data engineer at Optical instrument maker is responsible for device calibration readings. The view versus materialized view issue is that device_calibration_readings_central analysts require a simple always-current projection without a stored refresh process. The supporting evidence is that a team proposes a materialized view even though the logic is just a lightweight filter. The engineer must ensure that data access should reflect up-to-date table rows without unnecessary materialization cost. The failure and requirements have been diagnosed; the team must select the lasting pipeline or governance approach. Which durable Databricks control best addresses the requirement?

  1. Physically copy the entire source table every time a user opens a dashboard at Optical instrument maker
  2. Monitor view permissions, dependency changes and query performance for device_calibration_readings_central
  3. Compare source volatility, query cost and freshness needs for device_calibration_readings_central
  4. Use a standard governed view for low-cost logical projection rather than scheduled materialization

Explanation

Correct Answer

D:

Use a standard governed view for low-cost logical projection rather than scheduled materialization is the intended durable approach for device_calibration_readings_central: it addresses the verified problem (device_calibration_readings_central analysts require a simple always-current projection without a stored refresh process) while preserving the required behavior (data access should reflect up-to-date table rows without unnecessary materialization cost). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

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 Optical instrument maker) does not meet the requirement that data access should reflect up-to-date table rows without unnecessary materialization cost, nor does it constitute the target approach.

B:

Monitor view permissions, dependency changes and query performance for device_calibration_readings_central would help detect future recurrence, but metrics alone do not deliver the target approach. The device_calibration_readings_central requirement is that data access should reflect up-to-date table rows without unnecessary materialization cost.

C:

Compare source volatility, query cost and freshness needs for device_calibration_readings_central could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The device_calibration_readings_central workflow still requires that data access should reflect up-to-date table rows without unnecessary materialization cost.

Question 792

Consider the pollution_measurements_urban workload at Air quality nonprofit: pollution_measurements_urban CI reports successful deployment even though its Lakeflow job has never executed. Inspection found that the build log only shows resource creation, no job-run evidence. The governed outcome must ensure that release must demonstrate a working data pipeline, not just valid YAML. 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. Check whether bundle validation, deployment and execution steps are separated for pollution_measurements_urban
  2. Add a post-deployment smoke test and acceptance assertions to the CI pipeline
  3. Monitor smoke-test failures and drift between tested and deployed revisions
  4. Accept a successful YAML validation as proof the ETL output is correct at Air quality nonprofit

Explanation

Correct Answer

B:

Add a post-deployment smoke test and acceptance assertions to the CI pipeline is the intended durable approach for pollution_measurements_urban: it addresses the verified problem (pollution_measurements_urban CI reports successful deployment even though its Lakeflow job has never executed) while preserving the required behavior (release must demonstrate a working data pipeline, not just valid YAML). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Check whether bundle validation, deployment and execution steps are separated for pollution_measurements_urban could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The pollution_measurements_urban workflow still requires that release must demonstrate a working data pipeline, not just valid YAML.

C:

Monitor smoke-test failures and drift between tested and deployed revisions would help detect future recurrence, but metrics alone do not deliver the target approach. The pollution_measurements_urban requirement is that release must demonstrate a working data pipeline, not just valid YAML.

D:

Syntax validation cannot establish runtime data correctness. The proposed action (Accept a successful YAML validation as proof the ETL output is correct at Air quality nonprofit) does not meet the requirement that release must demonstrate a working data pipeline, not just valid YAML, nor does it constitute the target approach.

Question 793

A data engineer at Subscription video network is responsible for viewer activity data. The ingestion schema rescue issue is that the viewer_activity_data_south CSV feed has unrecognized optional columns and the ingest silently discards them. The supporting evidence is that raw samples show new attributes that do not appear in the bronze output. The engineer must ensure that unknown values must remain auditable even before mapping is approved. 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. Roll out controlled schema rules and record each new rescued field
  2. Verify unexpected columns are still recoverable without breaking known fields
  3. Overwrite source files after dropping all unrecognized fields at Subscription video network
  4. Retain unexpected fields in a rescued-data column or quarantined bronze path

Explanation

Correct Answer

A:

Roll out controlled schema rules and record each new rescued field provides a bounded way to introduce the approved solution into viewer_activity_data_south and detect an early mismatch. The existing signal is raw samples show new attributes that do not appear in the bronze output; a staged change protects the service requirement (unknown values must remain auditable even before mapping is approved) and makes rollback practical.

Incorrect Answers

B:

Verify unexpected columns are still recoverable without breaking known fields is a one-time acceptance check. It does not supply the controlled implementation step for viewer_activity_data_south; a passing test cannot substitute for the specific task now required.

C:

Discarded raw fields cannot be reconstructed during audit. The proposed action (Overwrite source files after dropping all unrecognized fields at Subscription video network) does not meet the requirement that unknown values must remain auditable even before mapping is approved, nor does it constitute the controlled implementation step.

D:

Retain unexpected fields in a rescued-data column or quarantined bronze path is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the viewer_activity_data_south scenario, the observed evidence is that raw samples show new attributes that do not appear in the bronze output; the requirement remains: unknown values must remain auditable even before mapping is approved.

Question 794

Consider the dispatch_and_delivery_status_rural workload at Food delivery franchise: a nightly load of dispatch_and_delivery_status_rural repeats files from yesterday and developers fear duplicate inserts. Inspection found that the same object-storage folder is scanned on each scheduled run. The governed outcome must ensure that only new source files should be appended without reprocessing prior paths. 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. Track new-file arrivals, load errors and unexpected source-file modifications for dispatch_and_delivery_status_rural
  2. Inspect file-level load history and path visibility for dispatch_and_delivery_status_rural
  3. Run unconditional INSERT SELECT over the complete folder on every retry at Food delivery franchise
  4. Use incremental idempotent COPY INTO against the governed Delta target

Explanation

Correct Answer

D:

Use incremental idempotent COPY INTO against the governed Delta target is the intended durable approach for dispatch_and_delivery_status_rural: it addresses the verified problem (a nightly load of dispatch_and_delivery_status_rural repeats files from yesterday and developers fear duplicate inserts) while preserving the required behavior (only new source files should be appended without reprocessing prior paths). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Track new-file arrivals, load errors and unexpected source-file modifications for dispatch_and_delivery_status_rural would help detect future recurrence, but metrics alone do not deliver the target approach. The dispatch_and_delivery_status_rural requirement is that only new source files should be appended without reprocessing prior paths.

B:

Inspect file-level load history and path visibility for dispatch_and_delivery_status_rural could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The dispatch_and_delivery_status_rural workflow still requires that only new source files should be appended without reprocessing prior paths.

C:

A blind append can duplicate previously processed records. The proposed action (Run unconditional INSERT SELECT over the complete folder on every retry at Food delivery franchise) does not meet the requirement that only new source files should be appended without reprocessing prior paths, nor does it constitute the target approach.

Question 795

A data engineer at Online bicycle retailer is responsible for product sales transactions. The table update trigger issue is that product_sales_transactions_east downstream transformation needs to run after its governed source table changes. The supporting evidence is that the source updates irregularly while cron polling starts empty jobs. The engineer must ensure that data freshness should follow actual table changes rather than wall-clock guesses. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. What evidence establishes that correct output is maintained?

  1. Verify that source table and trigger are supported for product_sales_transactions_east
  2. Modify source and confirm downstream task runs only after detectable update
  3. Enable the data-driven trigger and run a controlled upstream update
  4. Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer

Explanation

Correct Answer

B:

Modify source and confirm downstream task runs only after detectable update directly tests the behavior that should change after the correction. With the observed evidence (the source updates irregularly while cron polling starts empty jobs), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that data freshness should follow actual table changes instead of wall-clock guesses.

Incorrect Answers

A:

Verify that source table and trigger are supported for product_sales_transactions_east could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The product_sales_transactions_east workflow still requires that data freshness should follow actual table changes rather than wall-clock guesses.

C:

Enable the data-driven trigger and run a controlled upstream update 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 the source updates irregularly while cron polling starts empty jobs. This matters here because a data engineer at Online bicycle retailer is responsible for product sales transactions. The table update trigger….

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 the post-change acceptance test.

Question 796

At Community energy cooperative, the smart meter readings workflow depends on smart_meter_readings_delta. Engineers report that smart_meter_readings_delta table exposes national IDs to analysts who need only transaction amounts; the evidence is that query review shows raw identifier values in common reports. They require that users without an approved role must see masked sensitive columns. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. Which post-change acceptance check is strongest?

  1. Attach the mask in staging with explicit tested identity rules
  2. Query the same column as privileged and unprivileged groups
  3. Rename identifier column to a harmless label while leaving values visible at Community energy cooperative
  4. Identify sensitive attributes, entitled roles and current query exposure for smart_meter_readings_delta

Explanation

Correct Answer

B:

Query the same column as privileged and unprivileged groups directly tests the behavior that should change following the correction. With the observed evidence (query review shows raw identifier values in common reports), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that users without an approved role must see masked sensitive columns.

Incorrect Answers

A:

Attach the mask in staging with explicit tested identity rules 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 query review shows raw identifier values in common reports. Here, the relevant situation is: the smart meter readings workflow depends on smart_meter_readings_delta. Engineers report that….

C:

Renaming a column does not protect its contents. The proposed action (Rename identifier column to a harmless label while leaving values visible at Community energy cooperative) does not meet the requirement that users without an approved role must see masked sensitive columns, nor does it constitute the post-change acceptance test.

D:

Identify sensitive attributes, entitled roles and current query exposure for smart_meter_readings_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 smart_meter_readings_delta workflow still requires that users without an approved role must see masked sensitive columns.

Question 797

Consider the vessel_position_events_central workload at Maritime safety agency: vessel_position_events_central gold consumers need fresh incremental data from an append-only event feed. Inspection found that the source produces new events continuously while downstream reports lag by hours. The governed outcome must ensure that materialized output must incorporate new events with recoverable processing state. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. Which evidence-gathering action should precede an architectural change?

  1. Truncate and fully rebuild the target after every incoming event at Maritime safety agency
  2. Measure source update shape, processing latency and offset semantics for vessel_position_events_central
  3. Build a governed streaming table for continuous or triggered incremental append processing
  4. Deploy a streaming table with tested recovery checkpoints and refresh configuration

Explanation

Correct Answer

B:

Measure source update shape, processing latency and offset semantics for vessel_position_events_central directly investigates the evidence (the source produces new events continuously while downstream reports lag by hours) and distinguishes possible causes of vessel_position_events_central gold consumers need fresh incremental data from an append-only event feed. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: materialized output must incorporate new events with recoverable processing state.

Incorrect Answers

A:

Full rebuilds are expensive and defeat incremental freshness goals. The proposed action (Truncate and fully rebuild the target after every incoming event at Maritime safety agency) does not meet the requirement that materialized output must incorporate new events with recoverable processing state, nor does it constitute the required pre-change investigation.

C:

Build a governed streaming table for continuous or triggered incremental append processing is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the vessel_position_events_central scenario, the observed evidence is that the source produces new events continuously while downstream reports lag by hours; the requirement remains: materialized output must incorporate new events with recoverable processing state.

D:

Deploy a streaming table with tested recovery checkpoints and refresh configuration 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 the source produces new events continuously while downstream reports lag by hours.

Question 798

Consider the citizen_service_applications_central workload at Local government portal: citizen_service_applications_central analysts need occasional queries of an external warehouse without full bulk ingestion. Inspection found that source data is large but analytics needs a small live subset. The governed outcome must ensure that governance should provide on-demand read access without an unnecessary copy. 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. Use Lakehouse Federation connection and foreign catalog for suitable source queries
  2. Query the external source through UC and compare returned authorized rows
  3. Copy the entire external database daily regardless of query demand at Local government portal
  4. Configure a scoped connection and grant access to a test foreign table

Explanation

Correct Answer

D:

Configure a scoped connection and grant access to a test foreign table provides a bounded way to introduce the approved solution into citizen_service_applications_central and detect an early mismatch. The existing signal is source data is large but analytics needs a small live subset; a staged change protects the service requirement (governance should provide on-demand read access without an unnecessary copy) and makes rollback practical.

Incorrect Answers

A:

Use Lakehouse Federation connection and foreign catalog for suitable source queries is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the citizen_service_applications_central scenario, the observed evidence is that source data is large but analytics needs a small live subset; the requirement remains: governance should provide on-demand read access without an unnecessary copy.

B:

Query the external source through UC and compare returned authorized rows is a one-time acceptance check. It does not supply the controlled implementation step for citizen_service_applications_central; a passing test cannot substitute for the specific task now required.

C:

Full-copy ingestion is not required for selective federated querying. The proposed action (Copy the entire external database daily regardless of query demand at Local government portal) does not meet the requirement that governance should provide on-demand read access without an unnecessary copy, nor does it constitute the controlled implementation step.

Question 799

At Coastal freight alliance, the shipment manifests workflow depends on shipment_manifests_urban. Engineers report that shipment_manifests_urban orders disappear from silver after a dimension join; the evidence is that audit shows some orders have a missing matching customer row. They require that all fact orders must remain visible even if a dimension lookup fails. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. Which post-change acceptance check is strongest?

  1. Introduce the corrected join with data-quality quarantine for missing attributes
  2. Compare fact input and output row counts and inspect unmatched dimension values
  3. Replace the fact join with inner join and discard nonmatches at Coastal freight alliance
  4. Count unmatched keys and examine join predicates for shipment_manifests_urban

Explanation

Correct Answer

B:

Compare fact input and output row counts and inspect unmatched dimension values directly tests the behavior that should change after the correction. With the observed evidence (audit shows some orders have a missing matching customer row), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that all fact orders must remain visible even if a dimension lookup fails.

Incorrect Answers

A:

Introduce the corrected join with data-quality quarantine for missing attributes 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 audit shows some orders have a missing matching customer row.

C:

An inner join suppresses facts when the right-side lookup is absent. The proposed action (Replace the fact join with inner join and discard nonmatches at Coastal freight alliance) does not meet the requirement that all fact orders must remain visible even if a dimension lookup fails, nor does it constitute the post-change acceptance test.

D:

Count unmatched keys and examine join predicates for shipment_manifests_urban could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The shipment_manifests_urban workflow still requires that all fact orders must remain visible even if a dimension lookup fails.

Question 800

At Regional telecom operator, the Unity Catalog lineage workflow handles subscriber provisioning logs. The problem is that subscriber_provisioning_logs_metro Gold dashboard shows wrong revenue and owners cannot trace the upstream dataset. Evidence: lineage view is missing a newly added silver transformation. Constraint: impact analysis needs upstream and downstream dependency visibility. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. Which change can be introduced with minimal production risk?

  1. Rely on file naming conventions as proof of full lineage at Regional telecom operator
  2. Instrument or update the supported job dependency record before release
  3. Use Unity Catalog lineage and supported pipeline metadata to trace data dependencies
  4. Compare inferred lineage to an actual source-to-gold test transformation

Explanation

Correct Answer

B:

Instrument or update the supported job dependency record before release provides a bounded way to introduce the approved solution into subscriber_provisioning_logs_metro and detect an early mismatch. The existing signal is lineage view is missing a newly added silver transformation; a staged change protects the service requirement (impact analysis needs upstream and downstream dependency visibility) and makes rollback practical.

Incorrect Answers

A:

Names alone cannot prove transformations and dependencies. The proposed action (Rely on file naming conventions as proof of full lineage at Regional telecom operator) does not meet the requirement that impact analysis needs upstream and downstream dependency visibility, nor does it constitute the controlled implementation step.

C:

Use Unity Catalog lineage and supported pipeline metadata to trace data dependencies is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the subscriber_provisioning_logs_metro scenario, the observed evidence is that lineage view is missing a newly added silver transformation; the requirement remains: impact analysis needs upstream and downstream dependency visibility.

D:

Compare inferred lineage to an actual source-to-gold test transformation is a one-time acceptance check. It does not supply the controlled implementation step for subscriber_provisioning_logs_metro; a passing test cannot substitute for the specific task now required.

Certified Data Engineer Associate Practice Tests