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Databricks Certified Data Engineer Associate Practice Test 10

Question 90

Consider the claims_payment_events_delta workload at Regional insurance broker: claims_payment_events_delta dashboard repeatedly scans years of silver transactions for daily rollups. Inspection found that SQL history shows expensive repeated aggregation on an otherwise stable reporting query. The governed outcome must ensure that analysts need low-latency aggregates refreshed on a defined cadence. 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. Verify refresh applies new silver rows and queries return the expected totals
  2. Create a regular view and promise it stores its results between queries at Regional insurance broker
  3. Monitor gold refresh age and incremental-refresh failures for claims_payment_events_delta
  4. Publish a materialized view for precomputed frequently queried aggregates

Explanation

Correct Answer

C:

Monitor gold refresh age and incremental-refresh failures for claims_payment_events_delta creates recurring visibility into the failure mode (claims_payment_events_delta dashboard repeatedly scans years of silver transactions for daily rollups). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while analysts need low-latency aggregates refreshed on a defined cadence.

Incorrect Answers

A:

Verify refresh applies new silver rows and queries return the expected totals is a one-time acceptance check. It does not supply continuing operational detection for claims_payment_events_delta; a passing test cannot substitute for the specific task now required.

B:

Ordinary views do not persist precomputed results. The proposed action (Create a regular view and promise it stores its results between queries at Regional insurance broker) does not meet the requirement that analysts need low-latency aggregates refreshed on a defined cadence, nor does it constitute continuing operational detection.

D:

Publish a materialized view for precomputed frequently queried aggregates is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the claims_payment_events_delta scenario, the observed evidence is that SQL history shows expensive repeated aggregation on an otherwise stable reporting query; the requirement remains: analysts need low-latency aggregates refreshed on a defined cadence.

Question 91

The pipeline_flow_metrics_metro pipeline at Public water district has this failure: pipeline_flow_metrics_metro DataFrame join change increases record count after merging. The team observed that PR diff contains a new join clause but CI checks only linting. Business requirement: joining behavior and key uniqueness must be tested before promotion. 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. Identify expected row cardinality and source fixture for pipeline_flow_metrics_metro
  2. Run a duplicate-key fixture and verify output matches expected cardinality
  3. Approve PRs solely on code formatting without data assertions at Public water district
  4. Introduce fixture-based tests into the PR workflow and gate merge

Explanation

Correct Answer

B:

Run a duplicate-key fixture and verify output matches expected cardinality directly tests the behavior that should change after the correction. With the observed evidence (PR diff contains a new join clause but CI checks only linting), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that joining behavior and key uniqueness must be tested before promotion.

Incorrect Answers

A:

Identify expected row cardinality and source fixture for pipeline_flow_metrics_metro could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The pipeline_flow_metrics_metro workflow still requires that joining behavior and key uniqueness must be tested before promotion.

C:

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 post-change acceptance test.

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 post-change acceptance test, especially given the evidence that PR diff contains a new join clause but CI checks only linting.

Question 92

The smart_meter_readings_central pipeline at Community energy cooperative has this failure: smart_meter_readings_central analysts have SELECT on a table but get a permission error at query time. The team observed that access review shows missing USE CATALOG on its parent catalog. Business requirement: users must read only the authorized governed object. 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. Query the table as an analyst and confirm sibling data remains denied
  2. Grant global metastore administration to fix one table query at Community energy cooperative
  3. Grant required parent USE CATALOG and USE SCHEMA along with table SELECT
  4. Apply least-privilege grants to an analyst group and test identity

Explanation

Correct Answer

D:

Apply least-privilege grants to an analyst group and test identity provides a bounded way to introduce the approved solution into smart_meter_readings_central and detect an early mismatch. The existing signal is access review shows missing USE CATALOG on its parent catalog; a staged change protects the service requirement (users must read only the authorized governed object) and makes rollback practical.

Incorrect Answers

A:

Query the table as an analyst and confirm sibling data remains denied is a one-time acceptance check. It does not supply the controlled implementation step for smart_meter_readings_central; a passing test cannot substitute for the specific task now required.

B:

Global admin rights exceed simple read access needs. The proposed action (Grant global metastore administration to fix one table query at Community energy cooperative) does not meet the requirement that users must read only the authorized governed object, nor does it constitute the controlled implementation step.

C:

Grant required parent USE CATALOG and USE SCHEMA along with table SELECT is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the smart_meter_readings_central scenario, the observed evidence is that access review shows missing USE CATALOG on its parent catalog; the requirement remains: users must read only the authorized governed object.

Question 93

Consider the control_testing_evidence_coastal workload at Financial audit partnership: the control_testing_evidence_coastal import stores files in personal workspace paths inaccessible to scheduled service principals. Inspection found that a job run fails to read a path that works under one engineer's user session. The governed outcome must ensure that source files must be reachable through governed identity and stable cloud storage. The new approach is deployed. The current task is to prove correct output and authorized behavior, not just successful installation. How should the team verify the original fault has been addressed?

  1. Run the same load under the production identity and verify access
  2. Inspect storage location, Unity Catalog volume grants and job run-as permissions for control_testing_evidence_coastal
  3. Embed a personal access token and home-directory file path in production code at Financial audit partnership
  4. Migrate input to a governed volume and reconfigure the job's scoped path

Explanation

Correct Answer

A:

Run the same load under the production identity and verify access directly tests the behavior that should change after the correction. With the observed evidence (a job run fails to read a path that works under one engineer's user session), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that source files must be reachable through governed identity and stable cloud storage.

Incorrect Answers

B:

Inspect storage location, Unity Catalog volume grants and job run-as permissions for control_testing_evidence_coastal could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The control_testing_evidence_coastal workflow still requires that source files must be reachable through governed identity and stable cloud storage.

C:

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 Financial audit partnership) does not meet the requirement that source files must be reachable through governed identity and stable cloud storage, nor does it constitute the post-change acceptance test.

D:

Migrate input to a governed volume and reconfigure the job's scoped path 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 a job run fails to read a path that works under one engineer's user session.

Question 94

At Maritime safety agency, the vessel position events workflow depends on vessel_position_events_urban. Engineers report that vessel_position_events_urban job points to the dev catalog even after deploying with the production target; the evidence is that configuration shows an unresolved dev catalog literal in the bundle. They require that one codebase must deploy safely to different UC environments. 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 Git code with a different unreviewed copy for every environment at Maritime safety agency
  2. Inspect bundle variables, target overrides and resolved job config for vessel_position_events_urban
  3. Add tested prod variable overrides and run validation before deploy
  4. Inspect resolved deployment and execute job under both targets to confirm isolation

Explanation

Correct Answer

D:

Inspect resolved deployment and execute job under both targets to confirm isolation directly tests the behavior that should change after the correction. With the observed evidence (configuration shows an unresolved dev catalog literal in the bundle), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that one codebase must deploy safely to different UC environments.

Incorrect Answers

A:

Diverging codebases defeat controlled promotion. The proposed action (Replace the Git code with a different unreviewed copy for every environment at Maritime safety agency) does not meet the requirement that one codebase must deploy safely to different UC environments, nor does it constitute the post-change acceptance test.

B:

Inspect bundle variables, target overrides and resolved job config for vessel_position_events_urban could clarify the original fault, but the available evidence already establishes its scope; it is not the post-change acceptance test now requested. The vessel_position_events_urban workflow still requires that one codebase must deploy safely to different UC environments.

C:

Add tested prod variable overrides and run validation before deploy 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 configuration shows an unresolved dev catalog literal in the bundle.

Question 95

At Veterinary clinic association, the treatment billing events workflow depends on treatment_billing_events_delta. Engineers report that treatment_billing_events_delta provider needs to offer a governed read-only subset to an external partner; the evidence is that partner does not have workspace access but needs fresh authorized data. They require that sharing must not distribute uncontrolled file copies or edit privileges. 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. Email raw Delta storage credentials and allow partner writes at Veterinary clinic association
  2. Inventory recipient type, share permissions and approved datasets for treatment_billing_events_delta
  3. Use Delta Sharing with a configured provider share and appropriate recipient credentials
  4. Add one approved dataset to the share and grant recipient access

Explanation

Correct Answer

B:

Inventory recipient type, share permissions and approved datasets for treatment_billing_events_delta directly investigates the evidence (partner does not have workspace access but needs fresh authorized data) and distinguishes possible causes of treatment_billing_events_delta provider needs to offer a governed read-only subset to an external partner. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: sharing must not distribute uncontrolled file copies or edit privileges.

Incorrect Answers

A:

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

C:

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

D:

Add one approved dataset to the share and grant recipient 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 partner does not have workspace access but needs fresh authorized data.

Question 96

At Cloud gaming cooperative, the match-session events workflow depends on match_session_events_west. Engineers report that match_session_events_west revenue reporting counts each customer event as if it were a unique customer; the evidence is that a sample shows three transactions from the same account on one date. They require that dashboard needs daily total revenue and distinct paying accounts. 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 total-versus-distinct counts and unexpected distribution shifts
  2. Use sum(account_id) or count of rows as unique-customer count at Cloud gaming cooperative
  3. Test a day with repeated account IDs and verify sum and distinct count
  4. GroupBy day with sum(amount) and countDistinct(account_id) for unique accounts

Explanation

Correct Answer

A:

Monitor total-versus-distinct counts and unexpected distribution shifts creates recurring visibility into the failure mode (match_session_events_west revenue reporting counts each customer event as if it were a unique customer). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while dashboard needs daily total revenue and distinct paying accounts.

Incorrect Answers

B:

Row counts or numeric sums cannot measure distinct account identifiers. The proposed action (Use sum(account_id) or count of rows as unique-customer count at Cloud gaming cooperative) does not meet the requirement that dashboard needs daily total revenue and distinct paying accounts, nor does it constitute continuing operational detection.

C:

Test a day with repeated account IDs and verify sum and distinct count is a one-time acceptance check. It does not supply continuing operational detection for match_session_events_west; a passing test cannot substitute for the specific task now required.

D:

GroupBy day with sum(amount) and countDistinct(account_id) for unique accounts is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the match_session_events_west scenario, the observed evidence is that a sample shows three transactions from the same account on one date; the requirement remains: dashboard needs daily total revenue and distinct paying accounts.

Question 97

The farm_loan_transaction_history_highland pipeline at Agricultural credit union has this failure: farm_loan_transaction_history_highland transformation intermittently fails with executor out-of-memory. The team observed that Spark UI shows large skewed partitions and executor lost errors. Business requirement: the job must process full input safely without excluding valid rows. 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. Pilot repartitioning or right-sizing against the failing data window
  2. Filter out the largest partition without business approval at Agricultural credit union
  3. Choose balanced partitioning and appropriate executor memory for the workload
  4. Run the previously failing input and confirm completion with result parity

Explanation

Correct Answer

A:

Pilot repartitioning or right-sizing against the failing data window provides a bounded way to introduce the approved solution into farm_loan_transaction_history_highland and detect an early mismatch. The existing signal is Spark UI shows large skewed partitions and executor lost errors; a staged change protects the service requirement (the job must process full input safely without excluding valid rows) and makes rollback practical.

Incorrect Answers

B:

Dropping data to avoid oom violates completeness. The proposed action (Filter out the largest partition without business approval at Agricultural credit union) does not meet the requirement that the job must process full input safely without excluding valid rows, nor does it constitute the controlled implementation step.

C:

Choose balanced partitioning and appropriate executor memory for the workload is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the farm_loan_transaction_history_highland scenario, the observed evidence is that Spark UI shows large skewed partitions and executor lost errors; the requirement remains: the job must process full input safely without excluding valid rows.

D:

Run the previously failing input and confirm completion with result parity is a one-time acceptance check. It does not supply the controlled implementation step for farm_loan_transaction_history_highland; a passing test cannot substitute for the specific task now required.

Question 98

At University research consortium, the experiment records workflow depends on experiment_records_central. Engineers report that experiment_records_central has one row per order with an array of purchased items; the evidence is that the silver table counts order-level rows as product-level units. They require that downstream inventory reporting needs one row per element with its parent key. 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. Split the serialized array text on commas without parsing JSON at University research consortium
  2. Apply explode or explode_outer deliberately while retaining the order ID
  3. Monitor empty-array and unexpected element types for experiment_records_central
  4. Verify element row counts and parent IDs for one-item and multi-item orders

Explanation

Correct Answer

C:

Monitor empty-array and unexpected element types for experiment_records_central creates recurring visibility into the failure mode (experiment_records_central has one row per order with an array of purchased items). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while downstream inventory reporting needs one row per element with its parent key.

Incorrect Answers

A:

String splitting is not a typed nested-array transformation. The proposed action (Split the serialized array text on commas without parsing JSON at University research consortium) does not meet the requirement that downstream inventory reporting needs one row per element with its parent key, nor does it constitute continuing operational detection.

B:

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

D:

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

Question 99

A data engineer at Retail pharmacy network is responsible for inventory adjustments. The predictive optimization behavior issue is that inventory_adjustments_rural managed table has manual OPTIMIZE jobs colliding with platform-managed maintenance. The supporting evidence is that table maintenance history shows overlapping compaction attempts. The engineer must ensure that the maintenance policy must avoid redundant cost and scheduling conflict. 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. Use predictive optimization where supported and retire redundant manual jobs
  2. Manually VACUUM all data files before retention safeguards are checked at Retail pharmacy network
  3. Monitor predictive optimization events, costs and deferred maintenance for inventory_adjustments_rural
  4. Inspect table eligibility, predictive optimization configuration and maintenance history for inventory_adjustments_rural

Explanation

Correct Answer

A:

Use predictive optimization where supported and retire redundant manual jobs is the intended durable approach for inventory_adjustments_rural: it addresses the verified problem (inventory_adjustments_rural managed table has manual OPTIMIZE jobs colliding with platform-managed maintenance) while preserving the required behavior (the maintenance policy must avoid redundant cost and scheduling conflict). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Unguarded vacuum can remove files needed for recovery. The proposed action (Manually VACUUM all data files before retention safeguards are checked at Retail pharmacy network) does not meet the requirement that the maintenance policy must avoid redundant cost and scheduling conflict, nor does it constitute the target approach.

C:

Monitor predictive optimization events, costs and deferred maintenance for inventory_adjustments_rural would help detect future recurrence, but metrics alone do not deliver the target approach. The inventory_adjustments_rural requirement is that the maintenance policy must avoid redundant cost and scheduling conflict.

D:

Inspect table eligibility, predictive optimization configuration and maintenance history for inventory_adjustments_rural could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The inventory_adjustments_rural workflow still requires that the maintenance policy must avoid redundant cost and scheduling conflict.

Question 100

The sampling_field_notes_north pipeline at Environmental inspection office has this failure: sampling_field_notes_north reporting team plans to drop a UC-managed table but needs its data files retained. The team observed that table ownership review shows storage lifecycle controlled by Unity Catalog. Business requirement: a cleanup must not accidentally delete retained source data. 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. Move to approved external storage only through a supported governed migration
  2. Inspect table type, location and intended retention before dropping sampling_field_notes_north
  3. Drop a disposable test table and verify actual data-lifecycle behavior
  4. Assume managed and external tables always have identical drop semantics at Environmental inspection office

Explanation

Correct Answer

C:

Drop a disposable test table and verify actual data-lifecycle behavior directly tests the behavior that should change after the correction. With the observed evidence (table ownership review shows storage lifecycle controlled by Unity Catalog), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that a cleanup must not accidentally delete retained source data.

Incorrect Answers

A:

Move to approved external storage only through a supported governed migration 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 table ownership review shows storage lifecycle controlled by Unity Catalog.

B:

Inspect table type, location and intended retention before dropping sampling_field_notes_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 sampling_field_notes_north workflow still requires that a cleanup must not accidentally delete retained source data.

D:

Uc table type affects ownership and managed data lifecycle. The proposed action (Assume managed and external tables always have identical drop semantics at Environmental inspection office) does not meet the requirement that a cleanup must not accidentally delete retained source data, nor does it constitute the post-change acceptance test.

Certified Data Engineer Associate Practice Tests