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Databricks Certified Data Engineer Associate Practice Test 24

Question 230

At International language school, the array explode workflow handles class enrollment data. The problem is that class_enrollment_data_west has one row per order with an array of purchased items. Evidence: the silver table counts order-level rows as product-level units. Constraint: downstream inventory reporting needs one row per element with its parent key. 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. Split the serialized array text on commas without parsing JSON at International language school
  2. Pilot nested extraction and test orders with multiple items
  3. Apply explode or explode_outer deliberately while retaining the order ID
  4. Verify element row counts and parent IDs for one-item and multi-item orders

Explanation

Correct Answer

B:

Pilot nested extraction and test orders with multiple items provides a bounded way to introduce the approved solution into class_enrollment_data_west and detect an early mismatch. The existing signal is the silver table counts order-level rows as product-level units; a staged change protects the service requirement (downstream inventory reporting needs one row per element with its parent key) and makes rollback practical.

Incorrect Answers

A:

String splitting is not a typed nested-array transformation. The proposed action (Split the serialized array text on commas without parsing JSON at International language school) does not meet the requirement that downstream inventory reporting needs one row per element with its parent key, nor does it constitute the controlled implementation step.

C:

Apply explode or explode_outer deliberately while retaining the order ID is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the class_enrollment_data_west scenario, the observed evidence is that the silver table counts order-level rows as product-level units; the requirement remains: downstream inventory reporting needs one row per element with its parent key.

D:

Verify element row counts and parent IDs for one-item and multi-item orders is a one-time acceptance check. It does not supply the controlled implementation step for class_enrollment_data_west; a passing test cannot substitute for the specific task now required.

Question 231

At E-commerce payments provider, the time-based versus event trigger workflow handles payment authorization records. The problem is that payment_authorization_records_rural ledger export is legally due at 06:00 even when no new records arrive. Evidence: operators propose a file trigger that may not run on quiet days. Constraint: an empty but valid daily export must still be delivered. 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. Use a time-based schedule for mandatory daily reporting independent of arrivals
  2. Simulate a day without files and verify on-time report generation
  3. Use only file-arrival triggers for a mandatory daily report at E-commerce payments provider
  4. Deploy cron schedule with a no-new-data success path

Explanation

Correct Answer

D:

Deploy cron schedule with a no-new-data success path provides a bounded way to introduce the approved solution into payment_authorization_records_rural and detect an early mismatch. The existing signal is operators propose a file trigger that may not run on quiet days; a staged change protects the service requirement (an empty but valid daily export must still be delivered) and makes rollback practical.

Incorrect Answers

A:

Use a time-based schedule for mandatory daily reporting independent of arrivals is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the payment_authorization_records_rural scenario, the observed evidence is that operators propose a file trigger that may not run on quiet days; the requirement remains: an empty but valid daily export must still be delivered.

B:

Simulate a day without files and verify on-time report generation is a one-time acceptance check. It does not supply the controlled implementation step for payment_authorization_records_rural; a passing test cannot substitute for the specific task now required.

C:

Quiet source days would skip the required calendar delivery. The proposed action (Use only file-arrival triggers for a mandatory daily report at E-commerce payments provider) does not meet the requirement that an empty but valid daily export must still be delivered, nor does it constitute the controlled implementation step.

Question 232

At Online bicycle retailer, the SQL query task workflow handles product sales transactions. The problem is that product_sales_transactions_rural team schedules a SQL aggregation by opening a dashboard manually. Evidence: history shows a query can run on SQL warehouse but has no job task. Constraint: the query must run automatically before downstream export. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. Which test should pass before the new flow is accepted?

  1. Trigger the job and verify SQL query result is available before export
  2. Inspect SQL statement, warehouse privileges and desired task dependencies for product_sales_transactions_rural
  3. Ask analysts to click Run on the query each morning at Online bicycle retailer
  4. Create the scheduled SQL task and bind it to the downstream export

Explanation

Correct Answer

A:

Trigger the job and verify SQL query result is available before export directly tests the behavior that should change following the correction. With the observed evidence (history shows a query can run on SQL warehouse but has no job task), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that the query must run automatically before downstream export.

Incorrect Answers

B:

Inspect SQL statement, warehouse privileges and desired task dependencies for product_sales_transactions_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 product_sales_transactions_rural workflow still requires that the query must run automatically before downstream export.

C:

Manual invocation does not provide reliable orchestration. The proposed action (Ask analysts to click Run on the query each morning at Online bicycle retailer) does not meet the requirement that the query must run automatically before downstream export, nor does it constitute the post-change acceptance test.

D:

Create the scheduled SQL task and bind it to the downstream export 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 history shows a query can run on SQL warehouse but has no job task. Here, the relevant situation is: the SQL query task workflow handles product sales transactions. The problem is that product_sales_transactions_rural….

Question 233

At Renewable energy operator, the job run-as identity workflow handles turbine sensor messages. The problem is that turbine_sensor_messages_coastal job succeeds for a developer but fails under the production scheduler. Evidence: audit logs show a personal identity has access that the service principal lacks. Constraint: production execution must use a durable least-privilege identity. 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. Share the developer's personal access token as a permanent production secret at Renewable energy operator
  2. Configure a scoped service principal job identity with required UC privileges
  3. Compare interactive and job run-as grants for turbine_sensor_messages_coastal inputs and targets
  4. Monitor permission failures and role creep for turbine_sensor_messages_coastal

Explanation

Correct Answer

B:

Configure a scoped service principal job identity with required UC privileges is the intended durable approach for turbine_sensor_messages_coastal: it addresses the verified problem (turbine_sensor_messages_coastal job succeeds for a developer but fails under the production scheduler) while preserving the required behavior (production execution must use a durable least-privilege identity). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

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 target approach.

C:

Compare interactive and job run-as grants for turbine_sensor_messages_coastal inputs and targets could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The turbine_sensor_messages_coastal workflow still requires that production execution must use a durable least-privilege identity.

D:

Monitor permission failures and role creep for turbine_sensor_messages_coastal would help detect future recurrence, but metrics alone do not deliver the target approach. The turbine_sensor_messages_coastal requirement is that production execution must use a durable least-privilege identity.

Question 234

At Coastal freight alliance, the bundle run after deploy workflow handles shipment manifests. The problem is that shipment_manifests_metro CI reports successful deployment even though its Lakeflow job has never executed. Evidence: the build log only shows resource creation, no job-run evidence. Constraint: release must demonstrate a working data pipeline, not just valid YAML. 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. Execute a scoped smoke run after bundle deployment and capture its ID
  2. Check whether bundle validation, deployment and execution steps are separated for shipment_manifests_metro
  3. Add a post-deployment smoke test and acceptance assertions to the CI pipeline
  4. Accept a successful YAML validation as proof the ETL output is correct at Coastal freight alliance

Explanation

Correct Answer

B:

Check whether bundle validation, deployment and execution steps are separated for shipment_manifests_metro directly investigates the evidence (the build log only shows resource creation, no job-run evidence) and distinguishes possible causes of shipment_manifests_metro CI reports successful deployment even though its Lakeflow job has never executed. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: release must demonstrate a working data pipeline, not just valid YAML.

Incorrect Answers

A:

Execute a scoped smoke run after bundle deployment and capture its ID 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 build log only shows resource creation, no job-run evidence.

C:

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 required pre-change investigation 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.

D:

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 required pre-change investigation.

Question 235

Consider the border_inspection_results_rural workload at Port customs authority: the border_inspection_results_rural telemetry producer emits events every few seconds but dashboards only need daily totals. Inspection found that profiling shows expensive continuous compute for an overnight business report. The governed outcome must ensure that ingestion frequency should reflect true freshness requirements and cost. 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. Choose scheduled incremental batch when a daily SLA does not warrant continuous processing
  2. Verify next-morning output and source-to-target reconciliation
  3. Switch one report to a scheduled ingest with measured completeness
  4. Force continuous high-cost processing solely because the source emits events frequently at Port customs authority

Explanation

Correct Answer

C:

Switch one report to a scheduled ingest with measured completeness provides a bounded way to introduce the approved solution into border_inspection_results_rural and detect an early mismatch. The existing signal is profiling shows expensive continuous compute for an overnight business report; a staged change protects the service requirement (ingestion frequency should reflect true freshness requirements and cost) and makes rollback practical.

Incorrect Answers

A:

Choose scheduled incremental batch when a daily SLA does not warrant continuous processing is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the border_inspection_results_rural scenario, the observed evidence is that profiling shows expensive continuous compute for an overnight business report; the requirement remains: ingestion frequency should reflect true freshness requirements and cost.

B:

Verify next-morning output and source-to-target reconciliation is a one-time acceptance check. It does not supply the controlled implementation step for border_inspection_results_rural; a passing test cannot substitute for the specific task now required.

D:

Source frequency alone does not justify a continuous target pipeline. The proposed action (Force continuous high-cost processing solely because the source emits events frequently at Port customs authority) does not meet the requirement that ingestion frequency should reflect true freshness requirements and cost, nor does it constitute the controlled implementation step.

Question 236

The pollution_measurements_urban pipeline at Air quality nonprofit has this failure: pollution_measurements_urban CI reports successful deployment even though its Lakeflow job has never executed. The team observed that the build log only shows resource creation, no job-run evidence. Business requirement: release must demonstrate a working data pipeline, not just valid YAML. The first acceptance run passed. The current task is to detect future regressions and changes over time. What should be tracked as an operational early warning?

  1. Monitor smoke-test failures and drift between tested and deployed revisions
  2. Add a post-deployment smoke test and acceptance assertions to the CI pipeline
  3. Accept a successful YAML validation as proof the ETL output is correct at Air quality nonprofit
  4. Verify outputs, run status and affected catalog resources after deployment

Explanation

Correct Answer

A:

Monitor smoke-test failures and drift between tested and deployed revisions creates recurring visibility into the failure mode (pollution_measurements_urban CI reports successful deployment even though its Lakeflow job has never executed). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while release must demonstrate a working data pipeline, not just valid YAML.

Incorrect Answers

B:

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 continuing operational detection at this stage. In the pollution_measurements_urban 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.

C:

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 continuing operational detection.

D:

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

Question 237

At Manufacturing quality network, the bundle deployment resource promotion workflow handles factory defect records. The problem is that factory_defect_records_delta pipeline configuration exists only in one engineer's workspace UI. Evidence: releasing to test requires manual reconstruction of tasks. Constraint: 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 change can be introduced with minimal production risk?

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

Explanation

Correct Answer

C:

Deploy the versioned bundle to test then prod with approval and target-specific config provides a bounded way to introduce the approved solution into factory_defect_records_delta 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:

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 factory_defect_records_delta; a passing test cannot substitute for the specific task now required.

B:

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

D:

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 factory_defect_records_delta 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.

Question 238

The treatment_billing_events_delta pipeline at Veterinary clinic association has this failure: treatment_billing_events_delta provider needs to offer a governed read-only subset to an external partner. The team observed that partner does not have workspace access but needs fresh authorized data. Business requirement: sharing must not distribute uncontrolled file copies or edit privileges. 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 Delta Sharing with a configured provider share and appropriate recipient credentials
  2. Query as the recipient and verify only intended datasets are visible
  3. Email raw Delta storage credentials and allow partner writes at Veterinary clinic association
  4. Add one approved dataset to the share and grant recipient access

Explanation

Correct Answer

D:

Add one approved dataset to the share and grant recipient access provides a bounded way to introduce the approved solution into treatment_billing_events_delta and detect an early mismatch. The existing signal is partner does not have workspace access but needs fresh authorized data; a staged change protects the service requirement (sharing must not distribute uncontrolled file copies or edit privileges) and makes rollback practical.

Incorrect Answers

A:

Use Delta Sharing with a configured provider share and appropriate recipient credentials is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the treatment_billing_events_delta scenario, the observed evidence is that partner does not have workspace access but needs fresh authorized data; the requirement remains: sharing must not distribute uncontrolled file copies or edit privileges.

B:

Query as the recipient and verify only intended datasets are visible is a one-time acceptance check. It does not supply the controlled implementation step for treatment_billing_events_delta; a passing test cannot substitute for the specific task now required.

C:

Sharing object-storage secrets bypasses governed read-only access. The proposed action (Email raw Delta storage credentials and allow partner writes at Veterinary clinic association) does not meet the requirement that sharing must not distribute uncontrolled file copies or edit privileges, nor does it constitute the controlled implementation step.

Question 239

At Local government portal, the inner versus left join workflow handles citizen service applications. The problem is that citizen_service_applications_metro orders disappear from silver after a dimension join. Evidence: audit shows some orders have a missing matching customer row. Constraint: all fact orders must remain visible even if a dimension lookup fails. 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. Use a left join from facts to customer dimension and flag unmatched rows
  2. Monitor dimension match rates and missing-key backfills for citizen_service_applications_metro
  3. Count unmatched keys and examine join predicates for citizen_service_applications_metro
  4. Replace the fact join with inner join and discard nonmatches at Local government portal

Explanation

Correct Answer

A:

Use a left join from facts to customer dimension and flag unmatched rows is the intended durable approach for citizen_service_applications_metro: it addresses the verified problem (citizen_service_applications_metro orders disappear from silver after a dimension join) while preserving the required behavior (all fact orders must remain visible even if a dimension lookup fails). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Monitor dimension match rates and missing-key backfills for citizen_service_applications_metro would help detect future recurrence, but metrics alone do not deliver the target approach. The citizen_service_applications_metro requirement is that all fact orders must remain visible even if a dimension lookup fails.

C:

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

D:

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 Local government portal) does not meet the requirement that all fact orders must remain visible even if a dimension lookup fails, nor does it constitute the target approach.

Question 240

A data engineer at Wholesale produce exchange is responsible for trade settlement files. The drift versus bundle source issue is that trade_settlement_files_delta production job UI was manually edited after bundle deployment. The supporting evidence is that resolved job settings differ from the versioned bundle manifest. The engineer must ensure that releases must remain traceable to approved Git changes. 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. Reapply the approved bundle after controlled review of production-only changes
  2. Compare actual resource definitions with deployed bundle target and source commit for trade_settlement_files_delta
  3. Update the source by copying random current production settings without review at Wholesale produce exchange
  4. Check resource properties and a smoke run against the approved manifest

Explanation

Correct Answer

D:

Check resource properties and a smoke run against the approved manifest directly tests the behavior that should change after the correction. With the observed evidence (resolved job settings differ from the versioned bundle manifest), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that releases must remain traceable to approved Git changes.

Incorrect Answers

A:

Reapply the approved bundle after controlled review of production-only changes 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 resolved job settings differ from the versioned bundle manifest.

B:

Compare actual resource definitions with deployed bundle target and source commit for trade_settlement_files_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 trade_settlement_files_delta workflow still requires that releases must remain traceable to approved Git changes.

C:

Unreviewed drift can be promoted into every environment. The proposed action (Update the source by copying random current production settings without review at Wholesale produce exchange) does not meet the requirement that releases must remain traceable to approved Git changes, nor does it constitute the post-change acceptance test.

Certified Data Engineer Associate Practice Tests