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Databricks Certified Data Engineer Associate Practice Test 94

Question 930

The fare_validation_events_rural pipeline at Public transport authority has this failure: fare_validation_events_rural gold report launches before silver validation finishes. The team observed that a task graph shows report and validation as parallel children of ingestion. Business requirement: downstream publishing must not start until all required upstream checks succeed. 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. Reconfigure the job task graph and test one run with a delayed validator
  2. Pause the validator and verify publish does not start early
  3. Schedule every task at the same clock time and hope upstream processing completes at Public transport authority
  4. Declare an explicit dependency from gold publishing to successful validation tasks

Explanation

Correct Answer

A:

Reconfigure the job task graph and test one run with a delayed validator provides a bounded way to introduce the approved solution into fare_validation_events_rural and detect an early mismatch. The existing signal is a task graph shows report and validation as parallel children of ingestion; a staged change protects the service requirement (downstream publishing must not start until all required upstream checks succeed) and makes rollback practical.

Incorrect Answers

B:

Pause the validator and verify publish does not start early is a one-time acceptance check. It does not supply the controlled implementation step for fare_validation_events_rural; a passing test cannot substitute for the specific task now required.

C:

Clock coincidence does not enforce dependency correctness. The proposed action (Schedule every task at the same clock time and hope upstream processing completes at Public transport authority) does not meet the requirement that downstream publishing must not start until all required upstream checks succeed, nor does it constitute the controlled implementation step.

D:

Declare an explicit dependency from gold publishing to successful validation tasks is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the fare_validation_events_rural scenario, the observed evidence is that a task graph shows report and validation as parallel children of ingestion; the requirement remains: downstream publishing must not start until all required upstream checks succeed.

Question 931

Consider the dispatch_and_delivery_status_highland workload at Food delivery franchise: dispatch_and_delivery_status_highland sort aggregation spills gigabytes of intermediates to disk. Inspection found that stage metrics show spilled bytes and GC pressure on executors. The governed outcome must ensure that the job should improve without losing aggregation accuracy. 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. Verify output and decreased spill plus completion time
  2. Disable logs and assume spilled data was never written at Food delivery franchise
  3. Right-size memory or repartition workload based on measured per-task pressure
  4. Trial an adjusted executor configuration on identical data volume

Explanation

Correct Answer

D:

Trial an adjusted executor configuration on identical data volume provides a bounded way to introduce the approved solution into dispatch_and_delivery_status_highland and detect an early mismatch. The existing signal is stage metrics show spilled bytes and GC pressure on executors; a staged change protects the service requirement (the job should improve without losing aggregation accuracy) and makes rollback practical.

Incorrect Answers

A:

Verify output and decreased spill plus completion time is a one-time acceptance check. It does not supply the controlled implementation step for dispatch_and_delivery_status_highland; a passing test cannot substitute for the specific task now required.

B:

Missing telemetry cannot correct memory pressure. The proposed action (Disable logs and assume spilled data was never written at Food delivery franchise) does not meet the requirement that the job should improve without losing aggregation accuracy, nor does it constitute the controlled implementation step.

C:

Right-size memory or repartition workload based on measured per-task pressure is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the dispatch_and_delivery_status_highland scenario, the observed evidence is that stage metrics show spilled bytes and GC pressure on executors; the requirement remains: the job should improve without losing aggregation accuracy.

Question 932

At E-commerce payments provider, the cluster startup failure workflow handles payment authorization records. The problem is that payment_authorization_records_east job fails before any Spark task begins. Evidence: cluster event log shows an unavailable instance type in the selected region. Constraint: the diagnostic must distinguish compute provisioning failure from ETL code defects. 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. Select a supported compute configuration or serverless option that meets the job constraints
  2. Rewrite successful SQL transformations without investigating provisioning at E-commerce payments provider
  3. Inspect cluster event log, quotas, network and cloud capacity for payment_authorization_records_east
  4. Monitor provisioning failures, retries and startup wait time for payment_authorization_records_east

Explanation

Correct Answer

A:

Select a supported compute configuration or serverless option that meets the job constraints is the intended durable approach for payment_authorization_records_east: it addresses the verified problem (payment_authorization_records_east job fails before any Spark task begins) while preserving the required behavior (the diagnostic must distinguish compute provisioning failure from ETL code defects). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Query changes cannot fix unavailable compute capacity. The proposed action (Rewrite successful SQL transformations without investigating provisioning at E-commerce payments provider) does not meet the requirement that the diagnostic must distinguish compute provisioning failure from ETL code defects, nor does it constitute the target approach.

C:

Inspect cluster event log, quotas, network and cloud capacity for payment_authorization_records_east could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The payment_authorization_records_east workflow still requires that the diagnostic must distinguish compute provisioning failure from ETL code defects.

D:

Monitor provisioning failures, retries and startup wait time for payment_authorization_records_east would help detect future recurrence, but metrics alone do not deliver the target approach. The payment_authorization_records_east requirement is that the diagnostic must distinguish compute provisioning failure from ETL code defects.

Question 933

Consider the pipeline_flow_metrics_north workload at Public water district: the pipeline_flow_metrics_north relational source emits inserts and updates but the lakehouse target retains multiple current versions. Inspection found that change records carry primary keys and update sequence numbers. The governed outcome must ensure that the destination must represent the latest source state without losing required history. 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. Apply multiple out-of-order changes and verify deterministic final state
  2. Monitor CDC lag, duplicate keys and discarded out-of-order updates for pipeline_flow_metrics_north
  3. Append every change as a new current row without keys at Public water district
  4. Use supported CDC apply logic with keys, ordering and defined delete handling

Explanation

Correct Answer

B:

Monitor CDC lag, duplicate keys and discarded out-of-order updates for pipeline_flow_metrics_north creates recurring visibility into the failure mode (the pipeline_flow_metrics_north relational source emits inserts and updates but the lakehouse target retains multiple current versions). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while the destination must represent the latest source state without losing required history.

Incorrect Answers

A:

Apply multiple out-of-order changes and verify deterministic final state is a one-time acceptance check. It does not supply continuing operational detection for pipeline_flow_metrics_north; a passing test cannot substitute for the specific task now required.

C:

An append-only current-state table does not resolve updates or deletes. The proposed action (Append every change as a new current row without keys at Public water district) does not meet the requirement that the destination must represent the latest source state without losing required history, nor does it constitute continuing operational detection.

D:

Use supported CDC apply logic with keys, ordering and defined delete handling is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the pipeline_flow_metrics_north scenario, the observed evidence is that change records carry primary keys and update sequence numbers; the requirement remains: the destination must represent the latest source state without losing required history.

Question 934

The loan_repayment_events_rural pipeline at Consumer finance platform has this failure: loan_repayment_events_rural sort aggregation spills gigabytes of intermediates to disk. The team observed that stage metrics show spilled bytes and GC pressure on executors. Business requirement: the job should improve without losing aggregation accuracy. 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. Compare per-task memory, partition sizes and spill metrics for loan_repayment_events_rural
  2. Disable logs and assume spilled data was never written at Consumer finance platform
  3. Trial an adjusted executor configuration on identical data volume
  4. Verify output and decreased spill plus completion time

Explanation

Correct Answer

D:

Verify output and decreased spill plus completion time directly tests the behavior that should change following the correction. With the observed evidence (stage metrics show spilled bytes and GC pressure on executors), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that the job should improve without losing aggregation accuracy.

Incorrect Answers

A:

Compare per-task memory, partition sizes and spill metrics for loan_repayment_events_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 loan_repayment_events_rural workflow still requires that the job should improve without losing aggregation accuracy.

B:

Missing telemetry cannot correct memory pressure. The proposed action (Disable logs and assume spilled data was never written at Consumer finance platform) does not meet the requirement that the job should improve without losing aggregation accuracy, nor does it constitute the post-change acceptance test.

C:

Trial an adjusted executor configuration on identical data volume 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 stage metrics show spilled bytes and GC pressure on executors. This matters here because the loan_repayment_events_rural pipeline at Consumer finance platform has this failure: loan_repayment_events_rural….

Question 935

The loan_repayment_events_south pipeline at Consumer finance platform has this failure: a nightly load of loan_repayment_events_south repeats files from yesterday and developers fear duplicate inserts. The team observed that the same object-storage folder is scanned on each scheduled run. Business requirement: only new source files should be appended without reprocessing prior paths. 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. Run unconditional INSERT SELECT over the complete folder on every retry at Consumer finance platform
  2. Use incremental idempotent COPY INTO against the governed Delta target
  3. Rerun the command with unchanged files and verify row counts do not double
  4. Schedule COPY INTO for loan_repayment_events_south and test a retry after successful ingestion

Explanation

Correct Answer

D:

Schedule COPY INTO for loan_repayment_events_south and test a retry after successful ingestion provides a bounded way to introduce the approved solution into loan_repayment_events_south and detect an early mismatch. The existing signal is the same object-storage folder is scanned on each scheduled run; a staged change protects the service requirement (only new source files should be appended without reprocessing prior paths) and makes rollback practical.

Incorrect Answers

A:

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

B:

Use incremental idempotent COPY INTO against the governed Delta target is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the loan_repayment_events_south scenario, the observed evidence is that the same object-storage folder is scanned on each scheduled run; the requirement remains: only new source files should be appended without reprocessing prior paths.

C:

Rerun the command with unchanged files and verify row counts do not double is a one-time acceptance check. It does not supply the controlled implementation step for loan_repayment_events_south; a passing test cannot substitute for the specific task now required.

Question 936

At Online bicycle retailer, the table update trigger workflow handles product sales transactions. The problem is that product_sales_transactions_east downstream transformation needs to run after its governed source table changes. Evidence: the source updates irregularly while cron polling starts empty jobs. Constraint: data freshness should follow actual table changes rather than wall-clock guesses. 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. Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer
  2. Verify that source table and trigger are supported for product_sales_transactions_east
  3. Monitor trigger delivery, lag and disabled-source conditions for product_sales_transactions_east
  4. Configure a table-update trigger tied to the supported source table

Explanation

Correct Answer

D:

Configure a table-update trigger tied to the supported source table is the intended durable approach for product_sales_transactions_east: it addresses the verified problem (product_sales_transactions_east downstream transformation needs to run after its governed source table changes) while preserving the required behavior (data freshness should follow actual table changes rather than wall-clock guesses). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

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 target approach.

B:

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 target approach now requested. The product_sales_transactions_east workflow still requires that data freshness should follow actual table changes rather than wall-clock guesses.

C:

Monitor trigger delivery, lag and disabled-source conditions for product_sales_transactions_east would help detect future recurrence, but metrics alone do not deliver the target approach. The product_sales_transactions_east requirement is that data freshness should follow actual table changes rather than wall-clock guesses.

Question 937

At Public pension trustee, the monthly pension movements workflow depends on monthly_pension_movements_island. Engineers report that monthly_pension_movements_island quality validation flags an empty input but the pipeline always publishes gold; the evidence is that the job DAG lacks an if/else decision based on validation outcome. They require that empty invalid batches must skip publication while still reporting status. 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. Identify the condition output and branch decisions required for monthly_pension_movements_island
  2. Test valid and invalid input and verify only the intended branch executes
  3. Always run publish regardless of validator outcome at Public pension trustee
  4. Deploy a condition and branch tasks using an output from the validator

Explanation

Correct Answer

B:

Test valid and invalid input and verify only the intended branch executes directly tests the behavior that should change following the correction. With the observed evidence (the job DAG lacks an if/else decision based on validation outcome), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that empty invalid batches must skip publication while still reporting status.

Incorrect Answers

A:

Identify the condition output and branch decisions required for monthly_pension_movements_island could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The monthly_pension_movements_island workflow still requires that empty invalid batches must skip publication while still reporting status.

C:

Unconditional publication violates the quality gate. The proposed action (Always run publish regardless of validator outcome at Public pension trustee) does not meet the requirement that empty invalid batches must skip publication while still reporting status, nor does it constitute the post-change acceptance test.

D:

Deploy a condition and branch tasks using an output from the validator 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 job DAG lacks an if/else decision based on validation outcome. Here, the relevant situation is: the monthly pension movements workflow depends on monthly_pension_movements_island. Engineers report that….

Question 938

At Port customs authority, the border inspection results workflow depends on border_inspection_results_island. Engineers report that nested arrays in border_inspection_results_island events are written as uninterpreted strings; the evidence is that sample JSON contains an array of line items under each order. They require that analytics requires one record per line item while retaining the parent ID. 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. Split raw JSON text on commas to infer nested objects at Port customs authority
  2. Parse nested JSON to typed structures and explode line arrays while preserving parent keys
  3. Land a raw bronze copy then curate line items into a governed silver table
  4. Inspect schema, array cardinality and nested field types for border_inspection_results_island

Explanation

Correct Answer

D:

Inspect schema, array cardinality and nested field types for border_inspection_results_island directly investigates the evidence (sample JSON contains an array of line items under each order) and distinguishes possible causes of nested arrays in border_inspection_results_island events are written as uninterpreted strings. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: analytics requires one record per line item while retaining the parent ID.

Incorrect Answers

A:

String splitting is not valid nested json parsing. The proposed action (Split raw JSON text on commas to infer nested objects at Port customs authority) does not meet the requirement that analytics requires one record per line item while retaining the parent ID, nor does it constitute the required pre-change investigation.

B:

Parse nested JSON to typed structures and explode line arrays while preserving parent keys is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the border_inspection_results_island scenario, the observed evidence is that sample JSON contains an array of line items under each order; the requirement remains: analytics requires one record per line item while retaining the parent ID.

C:

Land a raw bronze copy then curate line items into a governed silver table 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 sample JSON contains an array of line items under each order.

Question 939

At Regional telecom operator, the subscriber provisioning logs workflow depends on subscriber_provisioning_logs_delta. Engineers report that a subscriber_provisioning_logs_delta DataFrame operation unexpectedly produces billions of rows; the evidence is that the plan shows a cartesian product between two unrelated inputs. They require that records should match on explicit business keys without multiplying every pair. The failure and requirements have been diagnosed; the team must select the lasting pipeline or governance approach. Which platform or PySpark choice best fits the stated semantics?

  1. Track unexpected row amplification and crossJoin operators for subscriber_provisioning_logs_delta
  2. Leave the cross join in place because adding workers makes it semantically correct at Regional telecom operator
  3. Inspect join expressions, row estimates and missing join predicates for subscriber_provisioning_logs_delta
  4. Join on the correct equality keys rather than using a cross join

Explanation

Correct Answer

D:

Join on the correct equality keys rather than using a cross join is the intended durable approach for subscriber_provisioning_logs_delta: it addresses the verified problem (a subscriber_provisioning_logs_delta DataFrame operation unexpectedly produces billions of rows) while preserving the required behavior (records should match on explicit business keys without multiplying every pair). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Track unexpected row amplification and crossJoin operators for subscriber_provisioning_logs_delta would help detect future recurrence, but metrics alone do not deliver the target approach. The subscriber_provisioning_logs_delta requirement is that records should match on explicit business keys without multiplying every pair.

B:

Scaling cannot repair invalid join semantics. The proposed action (Leave the cross join in place because adding workers makes it semantically correct at Regional telecom operator) does not meet the requirement that records should match on explicit business keys without multiplying every pair, nor does it constitute the target approach.

C:

Inspect join expressions, row estimates and missing join predicates for subscriber_provisioning_logs_delta could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The subscriber_provisioning_logs_delta workflow still requires that records should match on explicit business keys without multiplying every pair.

Question 940

At Wholesale produce exchange, the trade settlement files workflow depends on trade_settlement_files_urban. Engineers report that trade_settlement_files_urban Gold dashboard shows wrong revenue and owners cannot trace the upstream dataset; the evidence is that lineage view is missing a newly added silver transformation. They require that impact analysis needs upstream and downstream dependency visibility. 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. Compare inferred lineage to an actual source-to-gold test transformation
  2. Use Unity Catalog lineage and supported pipeline metadata to trace data dependencies
  3. Monitor missing lineage links and changed downstream consumers for trade_settlement_files_urban
  4. Rely on file naming conventions as proof of full lineage at Wholesale produce exchange

Explanation

Correct Answer

C:

Monitor missing lineage links and changed downstream consumers for trade_settlement_files_urban creates recurring visibility into the failure mode (trade_settlement_files_urban Gold dashboard shows wrong revenue and owners cannot trace the upstream dataset). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while impact analysis needs upstream and downstream dependency visibility.

Incorrect Answers

A:

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

B:

Use Unity Catalog lineage and supported pipeline metadata to trace data dependencies is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the trade_settlement_files_urban 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:

Names alone cannot prove transformations and dependencies. The proposed action (Rely on file naming conventions as proof of full lineage at Wholesale produce exchange) does not meet the requirement that impact analysis needs upstream and downstream dependency visibility, nor does it constitute continuing operational detection.

Certified Data Engineer Associate Practice Tests