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Databricks Certified Data Engineer Associate Practice Test 91

Question 900

The product_sales_transactions_east pipeline at Online bicycle retailer has this failure: product_sales_transactions_east downstream transformation needs to run after its governed source table changes. The team observed that the source updates irregularly while cron polling starts empty jobs. Business requirement: data freshness should follow actual table changes rather than wall-clock guesses. 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. Enable the data-driven trigger and run a controlled upstream update
  2. Configure a table-update trigger tied to the supported source table
  3. Modify source and confirm downstream task runs only after detectable update
  4. Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer

Explanation

Correct Answer

A:

Enable the data-driven trigger and run a controlled upstream update provides a bounded way to introduce the approved solution into product_sales_transactions_east and detect an early mismatch. The existing signal is the source updates irregularly while cron polling starts empty jobs; a staged change protects the service requirement (data freshness should follow actual table changes rather than wall-clock guesses) and makes rollback practical.

Incorrect Answers

B:

Configure a table-update trigger tied to the supported source table is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the product_sales_transactions_east scenario, the observed evidence is that the source updates irregularly while cron polling starts empty jobs; the requirement remains: data freshness should follow actual table changes rather than wall-clock guesses.

C:

Modify source and confirm downstream task runs only after detectable update is a one-time acceptance check. It does not supply the controlled implementation step for product_sales_transactions_east; a passing test cannot substitute for the specific task now required.

D:

Coarse polling cannot consistently meet data-driven freshness. The proposed action (Schedule a blind daily task when source updates require immediate processing at Online bicycle retailer) does not meet the requirement that data freshness should follow actual table changes rather than wall-clock guesses, nor does it constitute the controlled implementation step.

Question 901

At Municipal waste service, the time-based versus event trigger workflow handles collection telemetry. The problem is that collection_telemetry_south ledger export is legally due at 06:00 even when no new records arrive. Evidence: operators propose a file trigger that may not run on quiet days. Constraint: an empty but valid daily export must still be delivered. 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. Verify whether output requirement is calendar-driven or source-event-driven for collection_telemetry_south
  2. Use a time-based schedule for mandatory daily reporting independent of arrivals
  3. Deploy cron schedule with a no-new-data success path
  4. Use only file-arrival triggers for a mandatory daily report at Municipal waste service

Explanation

Correct Answer

A:

Verify whether output requirement is calendar-driven or source-event-driven for collection_telemetry_south directly investigates the evidence (operators propose a file trigger that may not run on quiet days) and distinguishes possible causes of collection_telemetry_south ledger export is legally due at 06:00 even when no new records arrive. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: an empty but valid daily export must still be delivered.

Incorrect Answers

B:

Use a time-based schedule for mandatory daily reporting independent of arrivals is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the collection_telemetry_south scenario, the observed evidence is that operators propose a file trigger that may not run on quiet days; the requirement remains: an empty but valid daily export must still be delivered.

C:

Deploy cron schedule with a no-new-data success path 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 operators propose a file trigger that may not run on quiet days. Here, the relevant situation is: the time-based versus event trigger workflow handles collection telemetry. The problem is that….

D:

Quiet source days would skip the required calendar delivery. The proposed action (Use only file-arrival triggers for a mandatory daily report at Municipal waste service) does not meet the requirement that an empty but valid daily export must still be delivered, nor does it constitute the required pre-change investigation.

Question 902

The control_testing_evidence_coastal pipeline at Financial audit partnership has this failure: the control_testing_evidence_coastal import stores files in personal workspace paths inaccessible to scheduled service principals. The team observed that a job run fails to read a path that works under one engineer's user session. Business requirement: source files must be reachable through governed identity and stable cloud storage. 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. Inspect storage location, Unity Catalog volume grants and job run-as permissions for control_testing_evidence_coastal
  2. Embed a personal access token and home-directory file path in production code at Financial audit partnership
  3. Land files in a permitted external or managed Unity Catalog volume
  4. Monitor missing-volume grants and inaccessible source paths for control_testing_evidence_coastal

Explanation

Correct Answer

C:

Land files in a permitted external or managed Unity Catalog volume is the intended durable approach for control_testing_evidence_coastal: it addresses the verified problem (the control_testing_evidence_coastal import stores files in personal workspace paths inaccessible to scheduled service principals) while preserving the required behavior (source files must be reachable through governed identity and stable cloud storage). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

A:

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 target approach now requested. The control_testing_evidence_coastal workflow still requires that 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 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 target approach.

D:

Monitor missing-volume grants and inaccessible source paths for control_testing_evidence_coastal would help detect future recurrence, but metrics alone do not deliver the target approach. The control_testing_evidence_coastal requirement is that source files must be reachable through governed identity and stable cloud storage.

Question 903

The lab_sample_events_urban pipeline at Clinical diagnostics network has this failure: lab_sample_events_urban serves an exploratory dashboard counting hundreds of millions of unique session IDs. The team observed that exact count-distinct creates high aggregation cost during interactive prototyping. Business requirement: users explicitly accept bounded approximation in exchange for speed. 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. Measure cardinality, acceptable error and resource use for lab_sample_events_urban
  2. Compare estimate error and latency to the agreed tolerance
  3. Trial approximate aggregation on representative samples against exact ground truth
  4. Substitute sum(session_id) as an estimate of unique sessions at Clinical diagnostics network

Explanation

Correct Answer

B:

Compare estimate error and latency to the agreed tolerance directly tests the behavior that should change following the correction. With the observed evidence (exact count-distinct creates high aggregation cost during interactive prototyping), the acceptance result must demonstrate actual data or permission correctness, while retaining the requirement that users explicitly accept bounded approximation in exchange for speed.

Incorrect Answers

A:

Measure cardinality, acceptable error and resource use for lab_sample_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 lab_sample_events_urban workflow still requires that users explicitly accept bounded approximation in exchange for speed.

C:

Trial approximate aggregation on representative samples against exact ground truth 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 exact count-distinct creates high aggregation cost during interactive prototyping. This matters here because the lab_sample_events_urban pipeline at Clinical diagnostics network has this failure: lab_sample_events_urban….

D:

Adding identifiers is not a distinct-count estimator. The proposed action (Substitute sum(session_id) as an estimate of unique sessions at Clinical diagnostics network) does not meet the requirement that users explicitly accept bounded approximation in exchange for speed, nor does it constitute the post-change acceptance test.

Question 904

The water_quality_readings_highland pipeline at Aquaculture farming group has this failure: water_quality_readings_highland job has hundreds of thousands of very small tasks on a modest daily dataset. The team observed that Spark UI shows scheduling overhead dominates work time. Business requirement: the adjustment must keep exact output and avoid poor parallelism. 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. Reduce excessive partitions or enable adaptive coalescing as appropriate
  2. Monitor tiny-task fraction, scheduling latency and executor utilization for water_quality_readings_highland
  3. Compare results and runtime at multiple partition settings
  4. Set shuffle partitions to an arbitrary enormous value for all workloads at Aquaculture farming group

Explanation

Correct Answer

B:

Monitor tiny-task fraction, scheduling latency and executor utilization for water_quality_readings_highland creates recurring visibility into the failure mode (water_quality_readings_highland job has hundreds of thousands of very small tasks on a modest daily dataset). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while the adjustment must keep exact output and avoid poor parallelism.

Incorrect Answers

A:

Reduce excessive partitions or enable adaptive coalescing as appropriate is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the water_quality_readings_highland scenario, the observed evidence is that Spark UI shows scheduling overhead dominates work time; the requirement remains: the adjustment must keep exact output and avoid poor parallelism.

C:

Compare results and runtime at multiple partition settings is a one-time acceptance check. It does not supply continuing operational detection for water_quality_readings_highland; a passing test cannot substitute for the specific task now required.

D:

More tasks can increase scheduling overhead rather than speed work. The proposed action (Set shuffle partitions to an arbitrary enormous value for all workloads at Aquaculture farming group) does not meet the requirement that the adjustment must keep exact output and avoid poor parallelism, nor does it constitute continuing operational detection.

Question 905

Consider the ticket_transactions_south workload at Independent cinema group: ticket_transactions_south join hangs on one task while almost every task completes quickly. Inspection found that Spark UI reveals one partition contains most rows for a hot customer key. The governed outcome must ensure that optimization must preserve all correct joined rows. 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. Drop the most frequent business key to balance partitions at Independent cinema group
  2. Profile key frequencies and straggler task metrics for ticket_transactions_south
  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

D:

Address skew with AQE skew handling or justified key-salting strategy is the intended durable approach for ticket_transactions_south: it addresses the verified problem (ticket_transactions_south join hangs on one task while almost every task completes quickly) while preserving the required behavior (optimization must preserve all correct joined rows). A diagnostic or monitoring step alone would not create this target-state behavior.

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 the target approach.

B:

Profile key frequencies and straggler task metrics for ticket_transactions_south could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The ticket_transactions_south workflow still requires that optimization must preserve all correct joined rows.

C:

Monitor max-to-median task times and hot-key growth for ticket_transactions_south would help detect future recurrence, but metrics alone do not deliver the target approach. The ticket_transactions_south requirement is that optimization must preserve all correct joined rows.

Question 906

At Online apparel cooperative, the customer order changes workflow depends on customer_order_changes_west. Engineers report that customer_order_changes_west contractor group needs read-only curated aggregates but can edit source tables; the evidence is that privilege audit shows broad write grants inherited from a project role. They require that group must query approved output without data modification. 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. Grant SELECT on approved table and remove unnecessary write permissions
  2. Grant ALL PRIVILEGES on the entire catalog to a read-only group at Online apparel cooperative
  3. Run SELECT and attempted INSERT as contractor to confirm read-only behavior
  4. Monitor grant drift and denied write attempts for customer_order_changes_west

Explanation

Correct Answer

D:

Monitor grant drift and denied write attempts for customer_order_changes_west creates recurring visibility into the failure mode (customer_order_changes_west contractor group needs read-only curated aggregates but can edit source tables). Unlike a single successful test, the measure can reveal drift, lag, or new failures after later source and deployment changes while group must query approved output without data modification.

Incorrect Answers

A:

Grant SELECT on approved table and remove unnecessary write permissions is a plausible lasting design once chosen, but it does not perform continuing operational detection at this stage. In the customer_order_changes_west scenario, the observed evidence is that privilege audit shows broad write grants inherited from a project role; the requirement remains: group must query approved output without data modification.

B:

All privileges violate read-only requirement. The proposed action (Grant ALL PRIVILEGES on the entire catalog to a read-only group at Online apparel cooperative) does not meet the requirement that group must query approved output without data modification, nor does it constitute continuing operational detection.

C:

Run SELECT and attempted INSERT as contractor to confirm read-only behavior is a one-time acceptance check. It does not supply continuing operational detection for customer_order_changes_west; a passing test cannot substitute for the specific task now required.

Question 907

At Public water district, the Unity Catalog namespace workflow handles pipeline flow metrics. The problem is that engineers refer to pipeline_flow_metrics_urban by an ambiguous two-part name and access the wrong environment. Evidence: the same schema and table names exist under development and production catalogs. Constraint: code must resolve a single governed production object. 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. Use catalog.schema.table identifiers with explicit Unity Catalog ownership
  2. Check current catalog, schema and resolved fully qualified table for pipeline_flow_metrics_urban
  3. Audit cross-catalog references and unexpected access to pipeline_flow_metrics_urban
  4. Depend on each user's default catalog to identify the production table at Public water district

Explanation

Correct Answer

A:

Use catalog.schema.table identifiers with explicit Unity Catalog ownership is the intended durable approach for pipeline_flow_metrics_urban: it addresses the verified problem (engineers refer to pipeline_flow_metrics_urban by an ambiguous two-part name and access the wrong environment) while preserving the required behavior (code must resolve a single governed production object). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

Check current catalog, schema and resolved fully qualified table for pipeline_flow_metrics_urban 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_urban workflow still requires that code must resolve a single governed production object.

C:

Audit cross-catalog references and unexpected access to pipeline_flow_metrics_urban would help detect future recurrence, but metrics alone do not deliver the target approach. The pipeline_flow_metrics_urban requirement is that code must resolve a single governed production object.

D:

Implicit current-catalog resolution makes production writes ambiguous. The proposed action (Depend on each user's default catalog to identify the production table at Public water district) does not meet the requirement that code must resolve a single governed production object, nor does it constitute the target approach.

Question 908

The ticket_transactions_highland pipeline at Independent cinema group has this failure: ticket_transactions_highland Spark Declarative Pipeline is managed separately and not part of the daily job. The team observed that analytics runs before the pipeline produces its updated streaming table. Business requirement: job orchestration must wait for pipeline update completion. 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. Inspect pipeline identity, job task settings and downstream dependencies for ticket_transactions_highland
  2. Assume the pipeline auto-refreshes before every dashboard query at Independent cinema group
  3. Attach the governed pipeline to the job and pilot the execution graph
  4. Use a Lakeflow pipeline task with success dependency before analytics tasks

Explanation

Correct Answer

A:

Inspect pipeline identity, job task settings and downstream dependencies for ticket_transactions_highland directly investigates the evidence (analytics runs before the pipeline produces its updated streaming table) and distinguishes possible causes of ticket_transactions_highland Spark Declarative Pipeline is managed separately and not part of the daily job. It establishes what must be corrected without assuming a fix before verifying the stated business requirement: job orchestration must wait for pipeline update completion.

Incorrect Answers

B:

Uncontrolled refresh timing does not guarantee dependency order. The proposed action (Assume the pipeline auto-refreshes before every dashboard query at Independent cinema group) does not meet the requirement that job orchestration must wait for pipeline update completion, nor does it constitute the required pre-change investigation.

C:

Attach the governed pipeline to the job and pilot the execution graph 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 analytics runs before the pipeline produces its updated streaming table. This matters here because the ticket_transactions_highland pipeline at Independent cinema group has this failure: ticket_transactions_highland….

D:

Use a Lakeflow pipeline task with success dependency before analytics tasks is a plausible lasting design once chosen, but it does not perform the required pre-change investigation at this stage. In the ticket_transactions_highland scenario, the observed evidence is that analytics runs before the pipeline produces its updated streaming table; the requirement remains: job orchestration must wait for pipeline update completion.

Question 909

A data engineer at Aquaculture farming group is responsible for water-quality readings. The backfill recovery issue is that water_quality_readings_coastal failed halfway through a historical backfill, and a rerun doubles completed partitions. The supporting evidence is that run log records successfully committed early dates before failure. The engineer must ensure that recovery must replay only incomplete work or be provably idempotent. 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 partition-aware idempotent writes and recoverable backfill parameters
  2. List committed partitions, failed tasks and source batch identifiers for water_quality_readings_coastal
  3. Append the entire historical dataset on every restart at Aquaculture farming group
  4. Monitor retry replay volumes and partition reconciliation for water_quality_readings_coastal

Explanation

Correct Answer

A:

Use partition-aware idempotent writes and recoverable backfill parameters is the intended durable approach for water_quality_readings_coastal: it addresses the verified problem (water_quality_readings_coastal failed halfway through a historical backfill, and a rerun doubles completed partitions) while preserving the required behavior (recovery must replay only incomplete work or be provably idempotent). A diagnostic or monitoring step alone would not create this target-state behavior.

Incorrect Answers

B:

List committed partitions, failed tasks and source batch identifiers for water_quality_readings_coastal could clarify the original fault, but the available evidence already establishes its scope; it is not the target approach now requested. The water_quality_readings_coastal workflow still requires that recovery must replay only incomplete work or be provably idempotent.

C:

Unconditional append duplicates earlier successful partitions. The proposed action (Append the entire historical dataset on every restart at Aquaculture farming group) does not meet the requirement that recovery must replay only incomplete work or be provably idempotent, nor does it constitute the target approach.

D:

Monitor retry replay volumes and partition reconciliation for water_quality_readings_coastal would help detect future recurrence, but metrics alone do not deliver the target approach. The water_quality_readings_coastal requirement is that recovery must replay only incomplete work or be provably idempotent.

Question 910

At Clinical diagnostics network, the approximate distinct count workflow handles lab sample events. The problem is that lab_sample_events_urban serves an exploratory dashboard counting hundreds of millions of unique session IDs. Evidence: exact count-distinct creates high aggregation cost during interactive prototyping. Constraint: users explicitly accept bounded approximation in exchange for speed. 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. Trial approximate aggregation on representative samples against exact ground truth
  2. Compare estimate error and latency to the agreed tolerance
  3. Substitute sum(session_id) as an estimate of unique sessions at Clinical diagnostics network
  4. Use approx_count_distinct for approximate high-cardinality distinct estimates

Explanation

Correct Answer

A:

Trial approximate aggregation on representative samples against exact ground truth provides a bounded way to introduce the approved solution into lab_sample_events_urban and detect an early mismatch. The existing signal is exact count-distinct creates high aggregation cost during interactive prototyping; a staged change protects the service requirement (users explicitly accept bounded approximation in exchange for speed) and makes rollback practical.

Incorrect Answers

B:

Compare estimate error and latency to the agreed tolerance is a one-time acceptance check. It does not supply the controlled implementation step for lab_sample_events_urban; a passing test cannot substitute for the specific task now required.

C:

Adding identifiers is not a distinct-count estimator. The proposed action (Substitute sum(session_id) as an estimate of unique sessions at Clinical diagnostics network) does not meet the requirement that users explicitly accept bounded approximation in exchange for speed, nor does it constitute the controlled implementation step.

D:

Use approx_count_distinct for approximate high-cardinality distinct estimates is a plausible lasting design once chosen, but it does not perform the controlled implementation step at this stage. In the lab_sample_events_urban scenario, the observed evidence is that exact count-distinct creates high aggregation cost during interactive prototyping; the requirement remains: users explicitly accept bounded approximation in exchange for speed.

Certified Data Engineer Associate Practice Tests