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Databricks Certified Data Engineer Associate Practice Test 7

Question 60

At Manufacturing quality network, the factory defect records workflow depends on factory_defect_records_west. Engineers report that engineers refer to factory_defect_records_west by an ambiguous two-part name and access the wrong environment; the evidence is that the same schema and table names exist under development and production catalogs. They require that code must resolve a single governed production object. 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. Check current catalog, schema and resolved fully qualified table for factory_defect_records_west
  2. Resolve the intended table from the job identity and confirm prod/development isolation
  3. Depend on each user's default catalog to identify the production table at Manufacturing quality network
  4. Change the pipeline to explicit three-level names and test in a staging job

Explanation

Correct Answer

B:

Resolve the intended table from the job identity and confirm prod/development isolation directly tests the behavior that should change after the correction. With the observed evidence (the same schema and table names exist under development and production catalogs), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that code must resolve a single governed production object.

Incorrect Answers

A:

Check current catalog, schema and resolved fully qualified table for factory_defect_records_west could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The factory_defect_records_west workflow still requires that code must resolve a single governed production object.

C:

Implicit current-catalog resolution makes production writes ambiguous. The proposed action (Depend on each user's default catalog to identify the production table at Manufacturing quality network) does not meet the requirement that code must resolve a single governed production object, nor does it constitute the post-change acceptance test.

D:

Change the pipeline to explicit three-level names and test in a staging job 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 same schema and table names exist under development and production catalogs.

Question 61

Consider the factory_defect_records_central workload at Manufacturing quality network: factory_defect_records_central Delta table suffers frequent filter-pattern changes and costly partition rewrites. Inspection found that workload history alternates date and customer search predicates across teams. The governed outcome must ensure that layout optimization must adapt without a rigid proliferating partition tree. 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. Profile common filters, table size and clustering support for factory_defect_records_central
  2. Create thousands of tiny static partitions for every possible predicate at Manufacturing quality network
  3. Monitor clustering maintenance costs and changing query predicates for factory_defect_records_central
  4. Consider Liquid Clustering on appropriate columns with supported table features

Explanation

Correct Answer

D:

Consider Liquid Clustering on appropriate columns with supported table features is the intended durable approach for factory_defect_records_central: it addresses the verified problem (factory_defect_records_central Delta table suffers frequent filter-pattern changes and costly partition rewrites) while preserving the required behavior (layout optimization must adapt without a rigid proliferating partition tree). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

Profile common filters, table size and clustering support for factory_defect_records_central could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The factory_defect_records_central workflow still requires that layout optimization must adapt without a rigid proliferating partition tree.

B:

Overpartitioning drives metadata overhead and inflexible layout. The proposed action (Create thousands of tiny static partitions for every possible predicate at Manufacturing quality network) does not meet the requirement that layout optimization must adapt without a rigid proliferating partition tree, nor does it constitute the target approach.

C:

Monitor clustering maintenance costs and changing query predicates for factory_defect_records_central would help detect future recurrence, but metrics alone do not deliver the target approach. The factory_defect_records_central requirement is that layout optimization must adapt without a rigid proliferating partition tree.

Question 62

Consider the admission_scan_events_delta workload at Regional sporting venue: BI users query admission_scan_events_delta through engineering notebook compute with unpredictable startup and permissions. Inspection found that query history shows short read-only dashboards competing with development Spark sessions. The governed outcome must ensure that analysts need governed SQL concurrency and stable refresh latency. 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. Run representative concurrent queries and compare latency and spend
  2. Migrate one dashboard and verify warehouse permissions and query plans
  3. Serve the BI workload on an appropriately sized SQL warehouse with Unity Catalog access
  4. Grant BI users unrestricted notebook cluster administration at Regional sporting venue

Explanation

Correct Answer

B:

Migrate one dashboard and verify warehouse permissions and query plans provides a bounded way to introduce the approved solution into admission_scan_events_delta and detect an early mismatch. The existing signal is query history shows short read-only dashboards competing with development Spark sessions; a staged change protects the service requirement (analysts need governed SQL concurrency and stable refresh latency) and makes rollback practical.

Incorrect Answers

A:

Run representative concurrent queries and compare latency and spend is a one-time acceptance check. It does not supply the controlled implementation step for admission_scan_events_delta; a passing test cannot substitute for the specific task now required.

C:

Serve the BI workload on an appropriately sized SQL warehouse with Unity Catalog access is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the admission_scan_events_delta scenario, the observed evidence is that query history shows short read-only dashboards competing with development Spark sessions; the requirement remains: analysts need governed SQL concurrency and stable refresh latency.

D:

Broad compute administration is not necessary to query governed bi data. The proposed action (Grant BI users unrestricted notebook cluster administration at Regional sporting venue) does not meet the requirement that analysts need governed SQL concurrency and stable refresh latency, nor does it constitute the controlled implementation step.

Question 63

At Veterinary clinic association, the treatment billing events workflow depends on treatment_billing_events_delta. Engineers report that a treatment_billing_events_delta 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 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. Update a source row and verify correct incremental destination behavior
  2. Prefer a supported Lakeflow Connect managed connector with managed ingestion state
  3. Copy API secrets into a widely shared notebook and paste full responses manually at Veterinary clinic association
  4. Configure source credentials and destination catalog for a pilot sync

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

Prefer a supported Lakeflow Connect managed connector with managed ingestion state is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the treatment_billing_events_delta 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.

C:

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

Question 64

The collection_telemetry_south pipeline at Municipal waste service has this failure: collection_telemetry_south aggregation spends more time in shuffle than in input scanning. The team observed that Spark UI shows large shuffle read/write and long exchange stages. Business requirement: the transformation must preserve results while reducing unnecessary data movement. 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. Increase driver memory alone and assume shuffle disappears at Municipal waste service
  2. Reduce avoidable shuffles through appropriate join strategy and pre-aggregation
  3. Compare result equivalence and shuffle bytes before and after tuning
  4. Pilot a plan change with fixed input and capture Spark UI metrics

Explanation

Correct Answer

D:

Pilot a plan change with fixed input and capture Spark UI metrics provides a bounded way to introduce the approved solution into collection_telemetry_south and detect an early mismatch. The existing signal is Spark UI shows large shuffle read/write and long exchange stages; a staged change protects the service requirement (the transformation must preserve results while reducing unnecessary data movement) and makes rollback practical.

Incorrect Answers

A:

Driver sizing does not remove distributed shuffle operations. The proposed action (Increase driver memory alone and assume shuffle disappears at Municipal waste service) does not meet the requirement that the transformation must preserve results while reducing unnecessary data movement, nor does it constitute the controlled implementation step.

B:

Reduce avoidable shuffles through appropriate join strategy and pre-aggregation is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the collection_telemetry_south scenario, the observed evidence is that Spark UI shows large shuffle read/write and long exchange stages; the requirement remains: the transformation must preserve results while reducing unnecessary data movement.

C:

Compare result equivalence and shuffle bytes before and after tuning is a one-time acceptance check. It does not supply the controlled implementation step for collection_telemetry_south; a passing test cannot substitute for the specific task now required.

Question 65

At Public water district, the pull request regression tests workflow handles pipeline flow metrics. The problem is that pipeline_flow_metrics_metro DataFrame join change increases record count after merging. Evidence: PR diff contains a new join clause but CI checks only linting. Constraint: joining behavior and key uniqueness must be tested before promotion. 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. Introduce fixture-based tests into the PR workflow and gate merge
  2. Run a duplicate-key fixture and verify output matches expected cardinality
  3. Add functional transformation tests with known join and dedup assertions
  4. Approve PRs solely on code formatting without data assertions at Public water district

Explanation

Correct Answer

A:

Introduce fixture-based tests into the PR workflow and gate merge provides a bounded way to introduce the approved solution into pipeline_flow_metrics_metro and detect an early mismatch. The existing signal is PR diff contains a new join clause but CI checks only linting; a staged change protects the service requirement (joining behavior and key uniqueness must be tested before promotion) and makes rollback practical.

Incorrect Answers

B:

Run a duplicate-key fixture and verify output matches expected cardinality is a one-time acceptance check. It does not supply the controlled implementation step for pipeline_flow_metrics_metro; a passing test cannot substitute for the specific task now required.

C:

Add functional transformation tests with known join and dedup assertions is a plausible lasting design once chosen, but it does not perform the controlled implementation step 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:

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 controlled implementation step.

Question 66

A data engineer at Municipal waste service is responsible for collection telemetry. The Spark shuffle volume issue is that collection_telemetry_south aggregation spends more time in shuffle than in input scanning. The supporting evidence is that Spark UI shows large shuffle read/write and long exchange stages. The engineer must ensure that the transformation must preserve results while reducing unnecessary data movement. 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. Compare result equivalence and shuffle bytes before and after tuning
  2. Pilot a plan change with fixed input and capture Spark UI metrics
  3. Inspect physical plan exchanges, join keys and partition sizes for collection_telemetry_south
  4. Increase driver memory alone and assume shuffle disappears at Municipal waste service

Explanation

Correct Answer

A:

Compare result equivalence and shuffle bytes before and after tuning directly tests the behavior that should change following the correction. With the observed evidence (Spark UI shows large shuffle read/write and long exchange stages), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that the transformation must preserve results while reducing unnecessary data movement.

Incorrect Answers

B:

Pilot a plan change with fixed input and capture Spark UI metrics 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 Spark UI shows large shuffle read/write and long exchange stages. This matters here because a data engineer at Municipal waste service is responsible for collection telemetry. The Spark shuffle volume issue….

C:

Inspect physical plan exchanges, join keys and partition sizes for collection_telemetry_south could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The collection_telemetry_south workflow still requires that the transformation must preserve results while reducing unnecessary data movement.

D:

Driver sizing does not remove distributed shuffle operations. The proposed action (Increase driver memory alone and assume shuffle disappears at Municipal waste service) does not meet the requirement that the transformation must preserve results while reducing unnecessary data movement, nor does it constitute the post-change acceptance test.

Question 67

At Online bicycle retailer, the product sales transactions workflow depends on product_sales_transactions_island. Engineers report that product_sales_transactions_island job fails after a Python library upgrade despite unchanged notebook code; the evidence is that driver logs show incompatible package versions imported at startup. They require that dependency versions must be reproducible across production runs. 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. Monitor library drift and import failures for product_sales_transactions_island
  2. Verify the failing import and transformation work in clean compute
  3. Install random latest packages on shared production compute at Online bicycle retailer
  4. Pin compatible library versions with supported compute/runtime environment

Explanation

Correct Answer

A:

Monitor library drift and import failures for product_sales_transactions_island creates recurring visibility into the failure mode (product_sales_transactions_island job fails after a Python library upgrade despite unchanged notebook code). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while dependency versions must be reproducible across production runs.

Incorrect Answers

B:

Verify the failing import and transformation work in clean compute is a one-time acceptance check. It does not supply continuing operational detection for product_sales_transactions_island; a passing test cannot substitute for the specific task now required.

C:

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 continuing operational detection.

D:

Pin compatible library versions with supported compute/runtime environment is a plausible lasting design once chosen, but it does not perform continuing operational detection 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.

Question 68

Consider the shipment_manifests_north workload at Coastal freight alliance: shipment_manifests_north analysts need occasional queries of an external warehouse without full bulk ingestion. Inspection found that source data is large but analytics needs a small live subset. The governed outcome must ensure that governance should provide on-demand read access without an unnecessary copy. 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. Assess external connector support, latency and predicate pushdown for shipment_manifests_north
  2. Configure a scoped connection and grant access to a test foreign table
  3. Copy the entire external database daily regardless of query demand at Coastal freight alliance
  4. Use Lakehouse Federation connection and foreign catalog for suitable source queries

Explanation

Correct Answer

A:

Assess external connector support, latency and predicate pushdown for shipment_manifests_north directly investigates the evidence (source data is large but analytics needs a small live subset) and distinguishes possible causes of shipment_manifests_north analysts need occasional queries of an external warehouse without full bulk ingestion. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: governance should provide on-demand read access without an unnecessary copy.

Incorrect Answers

B:

Configure a scoped connection and grant access to a test foreign 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 source data is large but analytics needs a small live subset.

C:

Full-copy ingestion is not required for selective federated querying. The proposed action (Copy the entire external database daily regardless of query demand at Coastal freight alliance) does not meet the requirement that governance should provide on-demand read access without an unnecessary copy, nor does it constitute the required pre-change investigation.

D:

Use Lakehouse Federation connection and foreign catalog for suitable source queries is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the shipment_manifests_north scenario, the observed evidence is that source data is large but analytics needs a small live subset; the requirement remains: governance should provide on-demand read access without an unnecessary copy.

Question 69

At Retail pharmacy network, the nested JSON extraction workflow handles inventory adjustments. The problem is that nested arrays in inventory_adjustments_highland events are written as uninterpreted strings. Evidence: sample JSON contains an array of line items under each order. Constraint: analytics requires one record per line item while retaining the parent ID. The first acceptance run passed. The current task is to detect future regressions and changes over time. Which monitoring approach will detect newly emerging defects?

  1. Parse nested JSON to typed structures and explode line arrays while preserving parent keys
  2. Split raw JSON text on commas to infer nested objects at Retail pharmacy network
  3. Monitor newly nested fields, null child keys and malformed JSON for inventory_adjustments_highland
  4. Verify expected row multiplication and preserved parent/child relationships

Explanation

Correct Answer

C:

Monitor newly nested fields, null child keys and malformed JSON for inventory_adjustments_highland creates recurring visibility into the failure mode (nested arrays in inventory_adjustments_highland events are written as uninterpreted strings). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while analytics requires one record per line item while retaining the parent ID.

Incorrect Answers

A:

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 continuing operational detection at this stage. In the inventory_adjustments_highland 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.

B:

String splitting is not valid nested json parsing. The proposed action (Split raw JSON text on commas to infer nested objects at Retail pharmacy network) does not meet the requirement that analytics requires one record per line item while retaining the parent ID, nor does it constitute continuing operational detection.

D:

Verify expected row multiplication and preserved parent/child relationships is a one-time acceptance check. It does not supply continuing operational detection for inventory_adjustments_highland; a passing test cannot substitute for the specific task now required.

Question 70

The rental_subsidy_payments_highland pipeline at Urban housing fund has this failure: the rental_subsidy_payments_highland telemetry producer emits events every few seconds but dashboards only need daily totals. The team observed that profiling shows expensive continuous compute for an overnight business report. Business requirement: 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. What should be done next to deploy the approved solution?

  1. Force continuous high-cost processing solely because the source emits events frequently at Urban housing fund
  2. Verify next-morning output and source-to-target reconciliation
  3. Choose scheduled incremental batch when a daily SLA does not warrant continuous processing
  4. Switch one report to a scheduled ingest with measured completeness

Explanation

Correct Answer

D:

Switch one report to a scheduled ingest with measured completeness provides a bounded way to introduce the approved solution into rental_subsidy_payments_highland 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:

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 Urban housing fund) does not meet the requirement that ingestion frequency should reflect true freshness requirements and cost, nor does it constitute the controlled implementation step.

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

C:

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 rental_subsidy_payments_highland 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.

Certified Data Engineer Associate Practice Tests