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Databricks Certified Data Engineer Associate Practice Test 2

Question 10

Consider the admission_scan_events_central workload at Regional sporting venue: admission_scan_events_central final export shows success even though an optional upstream data audit failed. Inspection found that the team treats final task status as whole-pipeline correctness. The governed outcome must ensure that operational alerts must reflect required DAG path failures. 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. Monitor only the last task while ignoring failed required upstream nodes at Regional sporting venue
  2. Inspect task graph run states and required-versus-optional dependencies for admission_scan_events_central
  3. Set success criteria and notifications on required tasks and aggregate job outcome
  4. Monitor repeated task skips, failure rate and false-green executions for admission_scan_events_central

Explanation

Correct Answer

C:

Set success criteria and notifications on required tasks and aggregate job outcome is the intended durable approach for admission_scan_events_central: it addresses the verified problem (admission_scan_events_central final export shows success even though an optional upstream data audit failed) while preserving the required behavior (operational alerts must reflect required DAG path failures). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Last-task success does not prove full dag correctness. The proposed action (Monitor only the last task while ignoring failed required upstream nodes at Regional sporting venue) does not meet the requirement that operational alerts must reflect required DAG path failures, nor does it constitute the target approach.

B:

Inspect task graph run states and required-versus-optional dependencies for admission_scan_events_central could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The admission_scan_events_central workflow still requires that operational alerts must reflect required DAG path failures.

D:

Monitor repeated task skips, failure rate and false-green executions for admission_scan_events_central would help detect future recurrence, but metrics alone do not deliver the target approach. The admission_scan_events_central requirement is that operational alerts must reflect required DAG path failures.

Question 11

The ticket_transactions_south pipeline at Independent cinema group has this failure: ticket_transactions_south join hangs on one task while almost every task completes quickly. The team observed that Spark UI reveals one partition contains most rows for a hot customer key. Business requirement: optimization must preserve all correct joined rows. 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. Drop the most frequent business key to balance partitions at Independent cinema group
  2. Verify exact join output and reduced straggler duration
  3. Monitor max-to-median task times and hot-key growth for ticket_transactions_south
  4. Address skew with AQE skew handling or justified key-salting strategy

Explanation

Correct Answer

C:

Monitor max-to-median task times and hot-key growth for ticket_transactions_south creates recurring visibility into the failure mode (ticket_transactions_south join hangs on one task while almost every task completes quickly). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while optimization must preserve all correct joined rows.

Incorrect Answers

A:

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 continuing operational detection.

B:

Verify exact join output and reduced straggler duration is a one-time acceptance check. It does not supply continuing operational detection for ticket_transactions_south; a passing test cannot substitute for the specific task now required.

D:

Address skew with AQE skew handling or justified key-salting strategy is a plausible lasting design once chosen, but it does not perform continuing operational detection 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.

Question 12

The vessel_position_events_delta pipeline at Maritime safety agency has this failure: vessel_position_events_delta tracks successive device configurations and needs the most recent per device. The team observed that the raw table contains equal device_id rows with varying event timestamps. Business requirement: exactly one latest row per device must be selected using deterministic tie-breaks. 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. Call dropDuplicates(device_id) without an explicit ordering rule at Maritime safety agency
  2. Monitor tied-key anomalies and late configuration records for vessel_position_events_delta
  3. Inspect per-device timestamps and tie possibilities for vessel_position_events_delta
  4. Apply row_number over partitionBy(device_id) orderBy(timestamp desc, version desc)

Explanation

Correct Answer

D:

Apply row_number over partitionBy(device_id) orderBy(timestamp desc, version desc) is the intended durable approach for vessel_position_events_delta: it addresses the verified problem (vessel_position_events_delta tracks successive device configurations and needs the most recent per device) while preserving the required behavior (exactly one latest row per device must be selected using deterministic tie-breaks). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

An unordered dedup does not guarantee selection of the newest record. The proposed action (Call dropDuplicates(device_id) without an explicit ordering rule at Maritime safety agency) does not meet the requirement that exactly one latest row per device must be selected using deterministic tie-breaks, nor does it constitute the target approach.

B:

Monitor tied-key anomalies and late configuration records for vessel_position_events_delta would help detect future recurrence, but metrics alone do not deliver the target approach. The vessel_position_events_delta requirement is that exactly one latest row per device must be selected using deterministic tie-breaks.

C:

Inspect per-device timestamps and tie possibilities for vessel_position_events_delta could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The vessel_position_events_delta workflow still requires that exactly one latest row per device must be selected using deterministic tie-breaks.

Question 13

At Regional sporting venue, the admission scan events workflow depends on admission_scan_events_metro. Engineers report that a admission_scan_events_metro enterprise SaaS table requires recurring ingestion but the team maintains a brittle custom API crawler; the evidence is that API tokens expire and source field names change without ingestion alerts. They require that the source must arrive in governed Delta tables with manageable credential rotation. 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. Assess managed connector source support, permissions and refresh semantics for admission_scan_events_metro
  2. Copy API secrets into a widely shared notebook and paste full responses manually at Regional sporting venue
  3. Configure source credentials and destination catalog for a pilot sync
  4. Prefer a supported Lakeflow Connect managed connector with managed ingestion state

Explanation

Correct Answer

A:

Assess managed connector source support, permissions and refresh semantics for admission_scan_events_metro directly investigates the evidence (API tokens expire and source field names change without ingestion alerts) and distinguishes possible causes of a admission_scan_events_metro enterprise SaaS table requires recurring ingestion but the team maintains a brittle custom API crawler. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: the source must arrive in governed Delta tables with manageable credential rotation.

Incorrect Answers

B:

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 Regional sporting venue) does not meet the requirement that the source must arrive in governed Delta tables with manageable credential rotation, nor does it constitute the required pre-change investigation.

C:

Configure source credentials and destination catalog for a pilot sync 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 API tokens expire and source field names change without ingestion alerts.

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 required pre-change investigation at this stage. In the admission_scan_events_metro 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 14

A data engineer at Regional sporting venue is responsible for admission scan events. The Delta Sharing cross-org issue is that admission_scan_events_metro provider needs to offer a governed read-only subset to an external partner. The supporting evidence is that partner does not have workspace access but needs fresh authorized data. The engineer must ensure that sharing must not distribute uncontrolled file copies or edit privileges. 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. Inventory recipient type, share permissions and approved datasets for admission_scan_events_metro
  2. Use Delta Sharing with a configured provider share and appropriate recipient credentials
  3. Monitor share access, recipient lifecycle and unexpected additions for admission_scan_events_metro
  4. Email raw Delta storage credentials and allow partner writes at Regional sporting venue

Explanation

Correct Answer

B:

Use Delta Sharing with a configured provider share and appropriate recipient credentials is the intended durable approach for admission_scan_events_metro: it addresses the verified problem (admission_scan_events_metro provider needs to offer a governed read-only subset to an external partner) while preserving the required behavior (sharing must not distribute uncontrolled file copies or edit privileges). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Inventory recipient type, share permissions and approved datasets for admission_scan_events_metro could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The admission_scan_events_metro workflow still requires that sharing must not distribute uncontrolled file copies or edit privileges.

C:

Monitor share access, recipient lifecycle and unexpected additions for admission_scan_events_metro would help detect future recurrence, but metrics alone do not deliver the target approach. The admission_scan_events_metro requirement is that sharing must not distribute uncontrolled file copies or edit privileges.

D:

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

Question 15

Consider the subscriber_provisioning_logs_central workload at Regional telecom operator: subscriber_provisioning_logs_central source timestamps arrive as mixed strings and local offsets. Inspection found that a daily fact report groups the same instant into different dates. The governed outcome must ensure that event time must use a documented timezone and typed timestamp convention. 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. Parse timestamps to a common typed convention before time-window aggregation
  2. Compare events around midnight and daylight-saving transitions in the output
  3. Compare time strings lexicographically and ignore offsets at Regional telecom operator
  4. Run a pilot cast with invalid values quarantined and documented time policy

Explanation

Correct Answer

D:

Run a pilot cast with invalid values quarantined and documented time policy provides a bounded way to introduce the approved solution into subscriber_provisioning_logs_central and detect an early mismatch. The existing signal is a daily fact report groups the same instant into different dates; a staged change protects the service requirement (event time must use a documented timezone and typed timestamp convention) and makes rollback practical.

Incorrect Answers

A:

Parse timestamps to a common typed convention before time-window aggregation is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the subscriber_provisioning_logs_central scenario, the observed evidence is that a daily fact report groups the same instant into different dates; the requirement remains: event time must use a documented timezone and typed timestamp convention.

B:

Compare events around midnight and daylight-saving transitions in the output is a one-time acceptance check. It does not supply the controlled implementation step for subscriber_provisioning_logs_central; a passing test cannot substitute for the specific task now required.

C:

String ordering and timezone ambiguity are not robust event-time modeling. The proposed action (Compare time strings lexicographically and ignore offsets at Regional telecom operator) does not meet the requirement that event time must use a documented timezone and typed timestamp convention, nor does it constitute the controlled implementation step.

Question 16

A data engineer at Pet-care booking platform is responsible for appointment requests. The DAG task dependency issue is that appointment_requests_highland gold report launches before silver validation finishes. The supporting evidence is that a task graph shows report and validation as parallel children of ingestion. The engineer must ensure that downstream publishing must not start until all required upstream checks succeed. 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. Schedule every task at the same clock time and hope upstream processing completes at Pet-care booking platform
  2. Reconfigure the job task graph and test one run with a delayed validator
  3. Declare an explicit dependency from gold publishing to successful validation tasks
  4. Read job DAG edges and task-run timestamps for appointment_requests_highland

Explanation

Correct Answer

D:

Read job DAG edges and task-run timestamps for appointment_requests_highland directly investigates the evidence (a task graph shows report and validation as parallel children of ingestion) and distinguishes possible causes of appointment_requests_highland gold report launches before silver validation finishes. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: downstream publishing must not start until all required upstream checks succeed.

Incorrect Answers

A:

Clock coincidence does not enforce dependency correctness. The proposed action (Schedule every task at the same clock time and hope upstream processing completes at Pet-care booking platform) does not meet the requirement that downstream publishing must not start until all required upstream checks succeed, nor does it constitute the required pre-change investigation.

B:

Reconfigure the job task graph and test one run with a delayed validator 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 a task graph shows report and validation as parallel children of ingestion.

C:

Declare an explicit dependency from gold publishing to successful validation tasks is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the appointment_requests_highland 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 17

At Regional museum alliance, the artifact metadata updates workflow depends on artifact_metadata_updates_north. Engineers report that a artifact_metadata_updates_north 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 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. Replace the accidental Cartesian step and run count parity tests
  2. Leave the cross join in place because adding workers makes it semantically correct at Regional museum alliance
  3. Verify every output row matches the intended keys with bounded cardinality
  4. Inspect join expressions, row estimates and missing join predicates for artifact_metadata_updates_north

Explanation

Correct Answer

C:

Verify every output row matches the intended keys with bounded cardinality directly tests the behavior that should change after the correction. With the observed evidence (the plan shows a cartesian product between two unrelated inputs), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that records should match on explicit business keys without multiplying every pair.

Incorrect Answers

A:

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 post-change acceptance test, especially given the evidence that the plan shows a cartesian product between two unrelated inputs.

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 museum alliance) does not meet the requirement that records should match on explicit business keys without multiplying every pair, nor does it constitute the post-change acceptance test.

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 post-change acceptance test now requested. The artifact_metadata_updates_north workflow still requires that records should match on explicit business keys without multiplying every pair.

Question 18

At Airport facilities operator, the share cost and egress workflow handles maintenance work orders. The problem is that maintenance_work_orders_central dataset is shared between clouds and network charges surprise the data provider. Evidence: billing shows recipient reads create cross-cloud data transfer. Constraint: sharing must meet cost and policy expectations. 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. Monitor recipient consumption and cross-cloud egress spikes for maintenance_work_orders_central
  2. Measure recipient location, data volumes and provider/recipient charge terms for maintenance_work_orders_central
  3. Assume cross-cloud data transfer is always free because sharing is read-only at Airport facilities operator
  4. Design an approved sharing pattern accounting for network egress and access controls

Explanation

Correct Answer

D:

Design an approved sharing pattern accounting for network egress and access controls is the intended durable approach for maintenance_work_orders_central: it addresses the verified problem (maintenance_work_orders_central dataset is shared between clouds and network charges surprise the data provider) while preserving the required behavior (sharing must meet cost and policy expectations). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Monitor recipient consumption and cross-cloud egress spikes for maintenance_work_orders_central would help detect future recurrence, but metrics alone do not deliver the target approach. The maintenance_work_orders_central requirement is that sharing must meet cost and policy expectations.

B:

Measure recipient location, data volumes and provider/recipient charge terms for maintenance_work_orders_central could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The maintenance_work_orders_central workflow still requires that sharing must meet cost and policy expectations.

C:

Read-only sharing can still incur network charges. The proposed action (Assume cross-cloud data transfer is always free because sharing is read-only at Airport facilities operator) does not meet the requirement that sharing must meet cost and policy expectations, nor does it constitute the target approach.

Question 19

The borrower_circulation_events_south pipeline at City library association has this failure: the borrower_circulation_events_south SQL source is polled hourly but every run extracts its entire ten-year table. The team observed that source query logs show full scans despite an indexed updated_at column. Business requirement: new and changed rows must load with a replay-safe high-water mark. The team has not selected a remedy. It first needs evidence that distinguishes the actual dependency or data fault. What should the engineer inspect to establish the failure mechanism?

  1. Use bounded incremental JDBC reads with a persisted watermark and merge keys
  2. Verify update timestamp semantics, primary keys and late-arrival window for borrower_circulation_events_south
  3. Run an initial backfill, then advance a tested watermark only after successful commit
  4. Advance the stored watermark before persisting the extracted batch at City library association

Explanation

Correct Answer

B:

Verify update timestamp semantics, primary keys and late-arrival window for borrower_circulation_events_south directly investigates the evidence (source query logs show full scans despite an indexed updated_at column) and distinguishes possible causes of the borrower_circulation_events_south SQL source is polled hourly but every run extracts its entire ten-year table. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: new and changed rows must load with a replay-safe high-water mark.

Incorrect Answers

A:

Use bounded incremental JDBC reads with a persisted watermark and merge keys is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the borrower_circulation_events_south scenario, the observed evidence is that source query logs show full scans despite an indexed updated_at column; the requirement remains: new and changed rows must load with a replay-safe high-water mark.

C:

Run an initial backfill, then advance a tested watermark only after successful commit 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 source query logs show full scans despite an indexed updated_at column.

D:

Premature watermark advancement can lose rows on failure. The proposed action (Advance the stored watermark before persisting the extracted batch at City library association) does not meet the requirement that new and changed rows must load with a replay-safe high-water mark, nor does it constitute the required pre-change investigation.

Question 20

At Online bicycle retailer, the library dependency conflict workflow handles product sales transactions. The problem is that product_sales_transactions_island job fails after a Python library upgrade despite unchanged notebook code. Evidence: driver logs show incompatible package versions imported at startup. Constraint: dependency versions must be reproducible across production runs. 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. Compare installed libraries, runtime version and import trace for product_sales_transactions_island
  2. Install random latest packages on shared production compute at Online bicycle retailer
  3. Pin compatible library versions with supported compute/runtime environment
  4. Rebuild a test environment with locked dependencies and execute a smoke run

Explanation

Correct Answer

A:

Compare installed libraries, runtime version and import trace for product_sales_transactions_island directly investigates the evidence (driver logs show incompatible package versions imported at startup) and distinguishes possible causes of product_sales_transactions_island job fails after a Python library upgrade despite unchanged notebook code. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: dependency versions must be reproducible across production runs.

Incorrect Answers

B:

Uncontrolled upgrades can introduce new incompatibilities. The proposed action (Install random latest packages on shared production compute at Online bicycle retailer) does not meet the requirement that dependency versions must be reproducible across production runs, nor does it constitute the required pre-change investigation.

C:

Pin compatible library versions with supported compute/runtime environment is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the product_sales_transactions_island scenario, the observed evidence is that driver logs show incompatible package versions imported at startup; the requirement remains: dependency versions must be reproducible across production runs.

D:

Rebuild a test environment with locked dependencies and execute a smoke run 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 driver logs show incompatible package versions imported at startup.

Certified Data Engineer Associate Practice Tests