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Databricks Certified Data Engineer Associate Practice Test 99

Question 980

Consider the monthly_pension_movements_rural workload at Public pension trustee: the monthly_pension_movements_rural CSV feed has unrecognized optional columns and the ingest silently discards them. Inspection found that raw samples show new attributes that do not appear in the bronze output. The governed outcome must ensure that unknown values must remain auditable even before mapping is approved. 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. Roll out controlled schema rules and record each new rescued field
  2. Retain unexpected fields in a rescued-data column or quarantined bronze path
  3. Overwrite source files after dropping all unrecognized fields at Public pension trustee
  4. Compare incoming headers with inferred schema and rescued fields for monthly_pension_movements_rural

Explanation

Correct Answer

D:

Compare incoming headers with inferred schema and rescued fields for monthly_pension_movements_rural directly investigates the evidence (raw samples show new attributes that do not appear in the bronze output) and distinguishes possible causes of the monthly_pension_movements_rural CSV feed has unrecognized optional columns and the ingest silently discards them. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: unknown values must remain auditable even before mapping is approved.

Incorrect Answers

A:

Roll out controlled schema rules and record each new rescued field 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 raw samples show new attributes that do not appear in the bronze output. This matters here because consider the monthly_pension_movements_rural workload at Public pension trustee: the monthly_pension_movements_rural….

B:

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 required pre-change investigation at this stage. In the monthly_pension_movements_rural 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.

C:

Discarded raw fields cannot be reconstructed during audit. The proposed action (Overwrite source files after dropping all unrecognized fields at Public pension trustee) does not meet the requirement that unknown values must remain auditable even before mapping is approved, nor does it constitute the required pre-change investigation.

Question 981

Consider the subscriber_provisioning_logs_delta workload at Regional telecom operator: a subscriber_provisioning_logs_delta DataFrame operation unexpectedly produces billions of rows. Inspection found that the plan shows a cartesian product between two unrelated inputs. The governed outcome must ensure that records should match on explicit business keys without multiplying every pair. 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. Join on the correct equality keys rather than using a cross join
  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. Replace the accidental Cartesian step and run count parity tests

Explanation

Correct Answer

C:

Inspect join expressions, row estimates and missing join predicates for subscriber_provisioning_logs_delta directly investigates the evidence (the plan shows a cartesian product between two unrelated inputs) and distinguishes possible causes of a subscriber_provisioning_logs_delta DataFrame operation unexpectedly produces billions of rows. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: records should match on explicit business keys without multiplying every pair.

Incorrect Answers

A:

Join on the correct equality keys rather than using a cross join is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the subscriber_provisioning_logs_delta scenario, the observed evidence is that the plan shows a cartesian product between two unrelated inputs; the requirement remains: 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 required pre-change investigation.

D:

Replace the accidental Cartesian step and run count parity tests 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 plan shows a cartesian product between two unrelated inputs. This matters here because consider the subscriber_provisioning_logs_delta workload at Regional telecom operator: a….

Question 982

A data engineer at Multinational parts distributor is responsible for warehouse movement logs. The Delta transaction isolation issue is that two concurrent writers update warehouse_movement_logs_central and a reader sometimes sees inconsistent exported copies. The supporting evidence is that the write log shows independent files were replaced while an ETL job was reading them. The engineer must ensure that readers require consistent committed versions without pausing ingest. 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. Allow direct writers to replace arbitrary Parquet files while readers scan them at Multinational parts distributor
  2. Store warehouse_movement_logs_central as a Delta table and rely on atomic transaction-log commits
  3. Convert the staging copy and cut over readers only after commit and rollback tests
  4. Read warehouse_movement_logs_central during overlapping test writes and verify a consistent committed snapshot

Explanation

Correct Answer

C:

Convert the staging copy and cut over readers only after commit and rollback tests provides a bounded way to introduce the approved solution into warehouse_movement_logs_central and detect an early mismatch. The existing signal is the write log shows independent files were replaced while an ETL job was reading them; a staged change protects the service requirement (readers require consistent committed versions without pausing ingest) and makes rollback practical.

Incorrect Answers

A:

Uncoordinated file replacement cannot provide delta transaction guarantees. The proposed action (Allow direct writers to replace arbitrary Parquet files while readers scan them at Multinational parts distributor) does not meet the requirement that readers require consistent committed versions without pausing ingest, nor does it constitute the controlled implementation step.

B:

Store warehouse_movement_logs_central as a Delta table and rely on atomic transaction-log commits is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the warehouse_movement_logs_central scenario, the observed evidence is that the write log shows independent files were replaced while an ETL job was reading them; the requirement remains: readers require consistent committed versions without pausing ingest.

D:

Read warehouse_movement_logs_central during overlapping test writes and verify a consistent committed snapshot is a one-time acceptance check. It does not supply the controlled implementation step for warehouse_movement_logs_central; a passing test cannot substitute for the specific task now required.

Question 983

A data engineer at Public water district is responsible for pipeline flow metrics. The bundle deployment resource promotion issue is that pipeline_flow_metrics_north pipeline configuration exists only in one engineer's workspace UI. The supporting evidence is that releasing to test requires manual reconstruction of tasks. The engineer must ensure that the same versioned workload definitions must deploy to multiple targets. 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. Monitor resource drift and unmanaged manually edited production jobs for pipeline_flow_metrics_north
  2. Inventory job, pipeline and permissions resources needed for pipeline_flow_metrics_north
  3. Package supported jobs and pipelines as Declarative Automation Bundle resources
  4. Recreate every task manually with different values in each environment at Public water district

Explanation

Correct Answer

C:

Package supported jobs and pipelines as Declarative Automation Bundle resources is the intended durable approach for pipeline_flow_metrics_north: it addresses the verified problem (pipeline_flow_metrics_north pipeline configuration exists only in one engineer's workspace UI) while preserving the required behavior (the same versioned workload definitions must deploy to multiple targets). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Monitor resource drift and unmanaged manually edited production jobs for pipeline_flow_metrics_north would help detect future recurrence, but metrics alone do not deliver the target approach. The pipeline_flow_metrics_north requirement is that the same versioned workload definitions must deploy to multiple targets.

B:

Inventory job, pipeline and permissions resources needed for pipeline_flow_metrics_north could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The pipeline_flow_metrics_north workflow still requires that the same versioned workload definitions must deploy to multiple targets.

D:

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

Question 984

Consider the pipeline_flow_metrics_metro workload at Public water district: pipeline_flow_metrics_metro DataFrame join change increases record count after merging. Inspection found that PR diff contains a new join clause but CI checks only linting. The governed outcome must ensure that joining behavior and key uniqueness must be tested before promotion. 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. Approve PRs solely on code formatting without data assertions at Public water district
  2. Add functional transformation tests with known join and dedup assertions
  3. Identify expected row cardinality and source fixture for pipeline_flow_metrics_metro
  4. Introduce fixture-based tests into the PR workflow and gate merge

Explanation

Correct Answer

C:

Identify expected row cardinality and source fixture for pipeline_flow_metrics_metro directly investigates the evidence (PR diff contains a new join clause but CI checks only linting) and distinguishes possible causes of pipeline_flow_metrics_metro DataFrame join change increases record count after merging. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: joining behavior and key uniqueness must be tested before promotion.

Incorrect Answers

A:

Well-formatted code can still produce incorrect data. The proposed action (Approve PRs solely on code formatting without data assertions at Public water district) does not meet the requirement that joining behavior and key uniqueness must be tested before promotion, nor does it constitute the required pre-change investigation.

B:

Add functional transformation tests with known join and dedup assertions is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the pipeline_flow_metrics_metro scenario, the observed evidence is that PR diff contains a new join clause but CI checks only linting; the requirement remains: joining behavior and key uniqueness must be tested before promotion.

D:

Introduce fixture-based tests into the PR workflow and gate merge 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 PR diff contains a new join clause but CI checks only linting.

Question 985

At Aquaculture farming group, the water-quality readings workflow depends on water_quality_readings_island. Engineers report that the water_quality_readings_island import stores files in personal workspace paths inaccessible to scheduled service principals; the evidence is that a job run fails to read a path that works under one engineer's user session. They require that source files must be reachable through governed identity and stable cloud storage. 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. Land files in a permitted external or managed Unity Catalog volume
  2. Embed a personal access token and home-directory file path in production code at Aquaculture farming group
  3. Migrate input to a governed volume and reconfigure the job's scoped path
  4. Run the same load under the production identity and verify access

Explanation

Correct Answer

C:

Migrate input to a governed volume and reconfigure the job's scoped path provides a bounded way to introduce the approved solution into water_quality_readings_island and detect an early mismatch. The existing signal is a job run fails to read a path that works under one engineer's user session; a staged change protects the service requirement (source files must be reachable through governed identity and stable cloud storage) and makes rollback practical.

Incorrect Answers

A:

Land files in a permitted external or managed Unity Catalog volume is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the water_quality_readings_island scenario, the observed evidence is that a job run fails to read a path that works under one engineer's user session; the requirement remains: source files must be reachable through governed identity and stable cloud storage.

B:

Personal paths and identities do not provide durable service access. The proposed action (Embed a personal access token and home-directory file path in production code at Aquaculture farming group) does not meet the requirement that source files must be reachable through governed identity and stable cloud storage, nor does it constitute the controlled implementation step.

D:

Run the same load under the production identity and verify access is a one-time acceptance check. It does not supply the controlled implementation step for water_quality_readings_island; a passing test cannot substitute for the specific task now required.

Question 986

At Consumer finance platform, the COPY INTO idempotent files workflow handles loan repayment events. The problem is that a nightly load of loan_repayment_events_south repeats files from yesterday and developers fear duplicate inserts. Evidence: the same object-storage folder is scanned on each scheduled run. Constraint: 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. What governed target implementation should the engineer design?

  1. Run unconditional INSERT SELECT over the complete folder on every retry at Consumer finance platform
  2. Inspect file-level load history and path visibility for loan_repayment_events_south
  3. Use incremental idempotent COPY INTO against the governed Delta target
  4. Track new-file arrivals, load errors and unexpected source-file modifications for loan_repayment_events_south

Explanation

Correct Answer

C:

Use incremental idempotent COPY INTO against the governed Delta target is the intended durable approach for loan_repayment_events_south: it addresses the verified problem (a nightly load of loan_repayment_events_south 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:

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 target approach.

B:

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

D:

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

Question 987

A data engineer at Independent cinema group is responsible for ticket transactions. The skewed join key issue is that ticket_transactions_south join hangs on one task while almost every task completes quickly. The supporting evidence is that Spark UI reveals one partition contains most rows for a hot customer key. The engineer must ensure that optimization must preserve all correct joined rows. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. What analysis is necessary before deciding on remediation?

  1. Test skew-aware join on representative hot and cold key samples
  2. Address skew with AQE skew handling or justified key-salting strategy
  3. Profile key frequencies and straggler task metrics for ticket_transactions_south
  4. Drop the most frequent business key to balance partitions at Independent cinema group

Explanation

Correct Answer

C:

Profile key frequencies and straggler task metrics for ticket_transactions_south directly investigates the evidence (Spark UI reveals one partition contains most rows for a hot customer key) and distinguishes possible causes of ticket_transactions_south join hangs on one task while almost every task completes quickly. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: optimization must preserve all correct joined rows.

Incorrect Answers

A:

Test skew-aware join on representative hot and cold key samples 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 Spark UI reveals one partition contains most rows for a hot customer key. This matters here because a data engineer at Independent cinema group is responsible for ticket transactions. The skewed join key issue is….

B:

Address skew with AQE skew handling or justified key-salting strategy is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the ticket_transactions_south scenario, the observed evidence is that Spark UI reveals one partition contains most rows for a hot customer key; the requirement remains: optimization must preserve all correct joined rows.

D:

Dropping a hot key loses legitimate data. The proposed action (Drop the most frequent business key to balance partitions at Independent cinema group) does not meet the requirement that optimization must preserve all correct joined rows, nor does it constitute the required pre-change investigation.

Question 988

A data engineer at Regional museum alliance is responsible for artifact metadata updates. The cross join explosion issue is that a artifact_metadata_updates_north DataFrame operation unexpectedly produces billions of rows. The supporting evidence is that the plan shows a cartesian product between two unrelated inputs. The engineer must ensure 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 durable Databricks control best addresses the requirement?

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

Explanation

Correct Answer

A:

Join on the correct equality keys rather than using a cross join is the intended durable approach for artifact_metadata_updates_north: it addresses the verified problem (a artifact_metadata_updates_north 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

B:

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

C:

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

D:

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

Question 989

At Consumer finance platform, the loan repayment events workflow depends on loan_repayment_events_rural. Engineers report that loan_repayment_events_rural sort aggregation spills gigabytes of intermediates to disk; the evidence is that stage metrics show spilled bytes and GC pressure on executors. They require that the job should improve without losing aggregation accuracy. 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. Disable logs and assume spilled data was never written at Consumer finance platform
  2. Right-size memory or repartition workload based on measured per-task pressure
  3. Compare per-task memory, partition sizes and spill metrics for loan_repayment_events_rural
  4. Monitor memory spill and long-GC trends for loan_repayment_events_rural

Explanation

Correct Answer

B:

Right-size memory or repartition workload based on measured per-task pressure is the intended durable approach for loan_repayment_events_rural: it addresses the verified problem (loan_repayment_events_rural sort aggregation spills gigabytes of intermediates to disk) while preserving the required behavior (the job should improve without losing aggregation accuracy). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

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 target approach.

C:

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 target approach now requested. The loan_repayment_events_rural workflow still requires that the job should improve without losing aggregation accuracy.

D:

Monitor memory spill and long-GC trends for loan_repayment_events_rural would help detect future recurrence, but metrics alone do not deliver the target approach. The loan_repayment_events_rural requirement is that the job should improve without losing aggregation accuracy.

Question 990

At University research consortium, the open versus Databricks Delta Sharing workflow handles experiment records. The problem is that experiment_records_north dataset is shared with a third party that does not run Databricks. Evidence: recipient cannot authenticate to a Databricks workspace but supports the open protocol. Constraint: the partner needs supported read-only interoperability. 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. Require every external organization to obtain provider workspace administrator access at University research consortium
  2. Choose open Delta Sharing recipient method for eligible non-Databricks consumers
  3. Issue recipient configuration using supported sharing workflow and test access
  4. Verify recipient client protocol and data-access obligations for experiment_records_north

Explanation

Correct Answer

D:

Verify recipient client protocol and data-access obligations for experiment_records_north directly investigates the evidence (recipient cannot authenticate to a Databricks workspace but supports the open protocol) and distinguishes possible causes of experiment_records_north dataset is shared with a third party that does not run Databricks. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: the partner needs supported read-only interoperability.

Incorrect Answers

A:

Workspace administration is not needed for open read-only sharing. The proposed action (Require every external organization to obtain provider workspace administrator access at University research consortium) does not meet the requirement that the partner needs supported read-only interoperability, nor does it constitute the required pre-change investigation.

B:

Choose open Delta Sharing recipient method for eligible non-Databricks consumers is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the experiment_records_north scenario, the observed evidence is that recipient cannot authenticate to a Databricks workspace but supports the open protocol; the requirement remains: the partner needs supported read-only interoperability.

C:

Issue recipient configuration using supported sharing workflow and test access 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 recipient cannot authenticate to a Databricks workspace but supports the open protocol.

Certified Data Engineer Associate Practice Tests