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Databricks Certified Data Engineer Associate Practice Test 78

Question 770

At Renewable energy operator, the turbine sensor messages workflow depends on turbine_sensor_messages_coastal. Engineers report that turbine_sensor_messages_coastal job succeeds for a developer but fails under the production scheduler; the evidence is that audit logs show a personal identity has access that the service principal lacks. They require that production execution must use a durable least-privilege identity. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. Which pre-change diagnostic will resolve the uncertainty?

  1. Compare interactive and job run-as grants for turbine_sensor_messages_coastal inputs and targets
  2. Switch run-as after validating access to each dependency
  3. Configure a scoped service principal job identity with required UC privileges
  4. Share the developer's personal access token as a permanent production secret at Renewable energy operator

Explanation

Correct Answer

A:

Compare interactive and job run-as grants for turbine_sensor_messages_coastal inputs and targets directly investigates the evidence (audit logs show a personal identity has access that the service principal lacks) and distinguishes possible causes of turbine_sensor_messages_coastal job succeeds for a developer but fails under the production scheduler. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: production execution must use a durable least-privilege identity.

Incorrect Answers

B:

Switch run-as after validating access to each dependency 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 audit logs show a personal identity has access that the service principal lacks.

C:

Configure a scoped service principal job identity with required UC privileges is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the turbine_sensor_messages_coastal scenario, the observed evidence is that audit logs show a personal identity has access that the service principal lacks; the requirement remains: production execution must use a durable least-privilege identity.

D:

Personal tokens are not durable least-privilege job identities. The proposed action (Share the developer's personal access token as a permanent production secret at Renewable energy operator) does not meet the requirement that production execution must use a durable least-privilege identity, nor does it constitute the required pre-change investigation.

Question 771

At E-commerce payments provider, the Auto Loader checkpoint workflow handles payment authorization records. The problem is that a streaming file reader for payment_authorization_records_coastal reprocesses historical data after every job restart. Evidence: the streaming query creates a new checkpoint directory on each run. Constraint: a restart must resume discovered files instead of replaying all existing input. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. Which investigation is the strongest first step?

  1. Inspect checkpoint continuity, discovery progress and input file identifiers
  2. Delete checkpoint state as part of each successful load at E-commerce payments provider
  3. Deploy the stream with a durable checkpoint and restart the same logical query
  4. Configure cloudFiles with a stable checkpoint path for the payment_authorization_records_coastal stream

Explanation

Correct Answer

A:

Inspect checkpoint continuity, discovery progress and input file identifiers directly investigates the evidence (the streaming query creates a new checkpoint directory on each run) and distinguishes possible causes of a streaming file reader for payment_authorization_records_coastal reprocesses historical data after every job restart. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: a restart must resume discovered files instead of replaying all existing input.

Incorrect Answers

B:

Deleting checkpoint progress can cause full replay. The proposed action (Delete checkpoint state as part of each successful load at E-commerce payments provider) does not meet the requirement that a restart must resume discovered files instead of replaying all existing input, nor does it constitute the required pre-change investigation.

C:

Deploy the stream with a durable checkpoint and restart the same logical query 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 streaming query creates a new checkpoint directory on each run. Here, the relevant situation is: the Auto Loader checkpoint workflow handles payment authorization records. The problem is that a streaming file….

D:

Configure cloudFiles with a stable checkpoint path for the payment_authorization_records_coastal stream is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the payment_authorization_records_coastal scenario, the observed evidence is that the streaming query creates a new checkpoint directory on each run; the requirement remains: a restart must resume discovered files instead of replaying all existing input.

Question 772

The water_quality_readings_rural pipeline at Aquaculture farming group has this failure: the water_quality_readings_rural landing zone has millions of objects and directory discovery is becoming expensive. The team observed that ingestion latency rises as source listing grows while only a few files arrive. Business requirement: incremental detection must scale without repeatedly listing the whole prefix. 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. Enable managed file-event discovery on a pilot source and retain checkpoint state
  2. Measure file discovery delay and completeness as the prefix grows
  3. Compare arrival rates, discovery costs and event-notification prerequisites for water_quality_readings_rural
  4. Recursively list the entire object-store prefix every second at Aquaculture farming group

Explanation

Correct Answer

B:

Measure file discovery delay and completeness as the prefix grows directly tests the behavior that should change after the correction. With the observed evidence (ingestion latency rises as source listing grows while only a few files arrive), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that incremental detection must scale without repeatedly listing the whole prefix. This matters here because the water_quality_readings_rural pipeline at Aquaculture farming group has this failure: the….

Incorrect Answers

A:

Enable managed file-event discovery on a pilot source and retain checkpoint state 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 ingestion latency rises as source listing grows while only a few files arrive. This matters here because the water_quality_readings_rural pipeline at Aquaculture farming group has this failure: the….

C:

Compare arrival rates, discovery costs and event-notification prerequisites for water_quality_readings_rural could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The water_quality_readings_rural workflow still requires that incremental detection must scale without repeatedly listing the whole prefix.

D:

Repeated full listings increase costs and discovery latency. The proposed action (Recursively list the entire object-store prefix every second at Aquaculture farming group) does not meet the requirement that incremental detection must scale without repeatedly listing the whole prefix, nor does it constitute the post-change acceptance test.

Question 773

The appointment_requests_south pipeline at Pet-care booking platform has this failure: appointment_requests_south team schedules a SQL aggregation by opening a dashboard manually. The team observed that history shows a query can run on SQL warehouse but has no job task. Business requirement: the query must run automatically before downstream export. 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. Trigger the job and verify SQL query result is available before export
  2. Ask analysts to click Run on the query each morning at Pet-care booking platform
  3. Create the scheduled SQL task and bind it to the downstream export
  4. Use a Lakeflow SQL query task configured with suitable warehouse and dependencies

Explanation

Correct Answer

C:

Create the scheduled SQL task and bind it to the downstream export provides a bounded way to introduce the approved solution into appointment_requests_south and detect an early mismatch. The existing signal is history shows a query can run on SQL warehouse but has no job task; a staged change protects the service requirement (the query must run automatically before downstream export) and makes rollback practical.

Incorrect Answers

A:

Trigger the job and verify SQL query result is available before export is a one-time acceptance check. It does not supply the controlled implementation step for appointment_requests_south; a passing test cannot substitute for the specific task now required.

B:

Manual invocation does not provide reliable orchestration. The proposed action (Ask analysts to click Run on the query each morning at Pet-care booking platform) does not meet the requirement that the query must run automatically before downstream export, nor does it constitute the controlled implementation step.

D:

Use a Lakeflow SQL query task configured with suitable warehouse and dependencies is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the appointment_requests_south scenario, the observed evidence is that history shows a query can run on SQL warehouse but has no job task; the requirement remains: the query must run automatically before downstream export.

Question 774

The treatment_billing_events_north pipeline at Veterinary clinic association has this failure: treatment_billing_events_north daily DataFrames have the same field names in different column orders. The team observed that union positional matching puts phone numbers into postal-code fields. Business requirement: combined data must align values by field name rather than column position. 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. Use unionByName with controlled missing-column behavior as needed
  2. Use positional union without checking source column order at Veterinary clinic association
  3. Validate schema compatibility and replace positional union in staging
  4. Compare samples with reordered columns to verify identity-preserving alignment

Explanation

Correct Answer

C:

Validate schema compatibility and replace positional union in staging provides a bounded way to introduce the approved solution into treatment_billing_events_north and detect an early mismatch. The existing signal is union positional matching puts phone numbers into postal-code fields; a staged change protects the service requirement (combined data must align values by field name rather than column position) and makes rollback practical.

Incorrect Answers

A:

Use unionByName with controlled missing-column behavior as needed is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the treatment_billing_events_north scenario, the observed evidence is that union positional matching puts phone numbers into postal-code fields; the requirement remains: combined data must align values by field name rather than column position.

B:

Position-based union can silently misalign values. The proposed action (Use positional union without checking source column order at Veterinary clinic association) does not meet the requirement that combined data must align values by field name rather than column position, nor does it constitute the controlled implementation step.

D:

Compare samples with reordered columns to verify identity-preserving alignment is a one-time acceptance check. It does not supply the controlled implementation step for treatment_billing_events_north; a passing test cannot substitute for the specific task now required.

Question 775

Consider the treatment_billing_events_west workload at Veterinary clinic association: treatment_billing_events_west contains duplicate message IDs after file retries. Inspection found that two rows share event_id but have different ingestion timestamps. The governed outcome must ensure that silver needs one deterministic event per business event identifier. 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. Use deterministic row_number or dropDuplicates on the correct business key and ordering rule
  2. Track duplicate-key rate and conflicting payloads for treatment_billing_events_west
  3. Verify duplicate business keys and ordering fields within treatment_billing_events_west
  4. DropDuplicates on every column when duplicates differ only by ingest timestamp at Veterinary clinic association

Explanation

Correct Answer

A:

Use deterministic row_number or dropDuplicates on the correct business key and ordering rule is the intended durable approach for treatment_billing_events_west: it addresses the verified problem (treatment_billing_events_west contains duplicate message IDs after file retries) while preserving the required behavior (silver needs one deterministic event per business event identifier). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Track duplicate-key rate and conflicting payloads for treatment_billing_events_west would help detect future recurrence, but metrics alone do not deliver the target approach. The treatment_billing_events_west requirement is that silver needs one deterministic event per business event identifier.

C:

Verify duplicate business keys and ordering fields within treatment_billing_events_west could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The treatment_billing_events_west workflow still requires that silver needs one deterministic event per business event identifier.

D:

All-column comparison misses business-key duplicates. The proposed action (DropDuplicates on every column when duplicates differ only by ingest timestamp at Veterinary clinic association) does not meet the requirement that silver needs one deterministic event per business event identifier, nor does it constitute the target approach.

Question 776

At Regional hospital network, the Auto Loader notification discovery workflow handles clinical appointment reports. The problem is that the clinical_appointment_reports_south landing zone has millions of objects and directory discovery is becoming expensive. Evidence: ingestion latency rises as source listing grows while only a few files arrive. Constraint: incremental detection must scale without repeatedly listing the whole prefix. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. Which investigation is the strongest first step?

  1. Select supported managed file events or notification mode when appropriate
  2. Compare arrival rates, discovery costs and event-notification prerequisites for clinical_appointment_reports_south
  3. Enable managed file-event discovery on a pilot source and retain checkpoint state
  4. Recursively list the entire object-store prefix every second at Regional hospital network

Explanation

Correct Answer

B:

Compare arrival rates, discovery costs and event-notification prerequisites for clinical_appointment_reports_south directly investigates the evidence (ingestion latency rises as source listing grows while only a few files arrive) and distinguishes possible causes of the clinical_appointment_reports_south landing zone has millions of objects and directory discovery is becoming expensive. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: incremental detection must scale without repeatedly listing the whole prefix.

Incorrect Answers

A:

Select supported managed file events or notification mode when appropriate is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the clinical_appointment_reports_south scenario, the observed evidence is that ingestion latency rises as source listing grows while only a few files arrive; the requirement remains: incremental detection must scale without repeatedly listing the whole prefix.

C:

Enable managed file-event discovery on a pilot source and retain checkpoint state 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 ingestion latency rises as source listing grows while only a few files arrive. Here, the relevant situation is: the Auto Loader notification discovery workflow handles clinical appointment reports. The problem is that the….

D:

Repeated full listings increase costs and discovery latency. The proposed action (Recursively list the entire object-store prefix every second at Regional hospital network) does not meet the requirement that incremental detection must scale without repeatedly listing the whole prefix, nor does it constitute the required pre-change investigation.

Question 777

At Independent cinema group, the ticket transactions workflow depends on ticket_transactions_highland. Engineers report that ticket_transactions_highland Spark Declarative Pipeline is managed separately and not part of the daily job; the evidence is that analytics runs before the pipeline produces its updated streaming table. They require that job orchestration must wait for pipeline update completion. 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. Inspect pipeline identity, job task settings and downstream dependencies for ticket_transactions_highland
  2. Assume the pipeline auto-refreshes before every dashboard query at Independent cinema group
  3. Attach the governed pipeline to the job and pilot the execution graph
  4. Trigger a full job and verify pipeline completion precedes analytics

Explanation

Correct Answer

D:

Trigger a full job and verify pipeline completion precedes analytics directly tests the behavior that should change following the correction. With the observed evidence (analytics runs before the pipeline produces its updated streaming table), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that job orchestration must wait for pipeline update completion.

Incorrect Answers

A:

Inspect pipeline identity, job task settings and downstream dependencies for ticket_transactions_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 ticket_transactions_highland workflow still requires that job orchestration must wait for pipeline update completion.

B:

Uncontrolled refresh timing does not guarantee dependency order. The proposed action (Assume the pipeline auto-refreshes before every dashboard query at Independent cinema group) does not meet the requirement that job orchestration must wait for pipeline update completion, nor does it constitute the post-change acceptance test.

C:

Attach the governed pipeline to the job and pilot the execution graph 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 analytics runs before the pipeline produces its updated streaming table. Here, the relevant situation is: the ticket transactions workflow depends on ticket_transactions_highland. Engineers report that….

Question 778

At Multinational parts distributor, the warehouse movement logs workflow depends on warehouse_movement_logs_metro. Engineers report that warehouse_movement_logs_metro bundle deployment fails after someone changes its job task reference; the evidence is that CLI output identifies invalid resource or variable configuration. They require that the error must be caught before production resources change. The target approach is approved. The current task is to introduce it safely with bounded scope and rollback. Which controlled implementation step is appropriate now?

  1. Add validation to CI and fail the job on errors
  2. Include `databricks bundle validate -t prod` before deployment
  3. Always run bundle deploy despite failing validation at Multinational parts distributor
  4. Submit a deliberately invalid bundle and confirm promotion is blocked

Explanation

Correct Answer

A:

Add validation to CI and fail the job on errors provides a bounded way to introduce the approved solution into warehouse_movement_logs_metro and detect an early mismatch. The existing signal is CLI output identifies invalid resource or variable configuration; a staged change protects the service requirement (the error must be caught before production resources change) and makes rollback practical.

Incorrect Answers

B:

Include `databricks bundle validate -t prod` before deployment is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the warehouse_movement_logs_metro scenario, the observed evidence is that CLI output identifies invalid resource or variable configuration; the requirement remains: the error must be caught before production resources change.

C:

Deploying invalid configuration bypasses the preflight gate. The proposed action (Always run bundle deploy despite failing validation at Multinational parts distributor) does not meet the requirement that the error must be caught before production resources change, nor does it constitute the controlled implementation step.

D:

Submit a deliberately invalid bundle and confirm promotion is blocked is a one-time acceptance check. It does not supply the controlled implementation step for warehouse_movement_logs_metro; a passing test cannot substitute for the specific task now required.

Question 779

Consider the smart_meter_readings_urban workload at Community energy cooperative: a smart_meter_readings_urban enterprise SaaS table requires recurring ingestion but the team maintains a brittle custom API crawler. Inspection found that API tokens expire and source field names change without ingestion alerts. The governed outcome must ensure that the source must arrive in governed Delta tables with manageable credential rotation. 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. Update a source row and verify correct incremental destination behavior
  2. Configure source credentials and destination catalog for a pilot sync
  3. Copy API secrets into a widely shared notebook and paste full responses manually at Community energy cooperative
  4. Prefer a supported Lakeflow Connect managed connector with managed ingestion state

Explanation

Correct Answer

B:

Configure source credentials and destination catalog for a pilot sync provides a bounded way to introduce the approved solution into smart_meter_readings_urban and detect an early mismatch. The existing signal is API tokens expire and source field names change without ingestion alerts; a staged change protects the service requirement (the source must arrive in governed Delta tables with manageable credential rotation) and makes rollback practical.

Incorrect Answers

A:

Update a source row and verify correct incremental destination behavior is a one-time acceptance check. It does not supply the controlled implementation step for smart_meter_readings_urban; a passing test cannot substitute for the specific task now required.

C:

Shared secrets and manual copies do not provide reliable governed ingestion. The proposed action (Copy API secrets into a widely shared notebook and paste full responses manually at Community energy cooperative) does not meet the requirement that the source must arrive in governed Delta tables with manageable credential rotation, nor does it constitute the controlled implementation step.

D:

Prefer a supported Lakeflow Connect managed connector with managed ingestion state is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the smart_meter_readings_urban scenario, the observed evidence is that API tokens expire and source field names change without ingestion alerts; the requirement remains: the source must arrive in governed Delta tables with manageable credential rotation.

Question 780

The inventory_adjustments_island pipeline at Retail pharmacy network has this failure: inventory_adjustments_island high-frequency triggers create overlapping job runs that overwrite the same gold partition. The team observed that run history shows two active instances of an identical pipeline. Business requirement: concurrent processing must respect destination write semantics. The failure and requirements have been diagnosed; the team must select the lasting pipeline or governance approach. What lasting solution should be selected for the verified conditions?

  1. Monitor queued and skipped runs with destination conflicts for inventory_adjustments_island
  2. Raise maximum concurrent runs without coordinating shared output writes at Retail pharmacy network
  3. Set maximum concurrent runs or isolation controls appropriate to the shared target
  4. Inspect overlap, idempotency and safe concurrency limit for inventory_adjustments_island

Explanation

Correct Answer

C:

Set maximum concurrent runs or isolation controls appropriate to the shared target is the intended durable approach for inventory_adjustments_island: it addresses the verified problem (inventory_adjustments_island high-frequency triggers create overlapping job runs that overwrite the same gold partition) while preserving the required behavior (concurrent processing must respect destination write semantics). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Monitor queued and skipped runs with destination conflicts for inventory_adjustments_island would help detect future recurrence, but metrics alone do not deliver the target approach. The inventory_adjustments_island requirement is that concurrent processing must respect destination write semantics.

B:

Overlapping unsafe writers can corrupt business results or cause failures. The proposed action (Raise maximum concurrent runs without coordinating shared output writes at Retail pharmacy network) does not meet the requirement that concurrent processing must respect destination write semantics, nor does it constitute the target approach.

D:

Inspect overlap, idempotency and safe concurrency limit for inventory_adjustments_island could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The inventory_adjustments_island workflow still requires that concurrent processing must respect destination write semantics.

Certified Data Engineer Associate Practice Tests