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Google Professional Data Engineer Practice Test 37

Question 360

A Google Cloud architecture review finds: A business data provider wants to revoke a partner's access to an outdated analytics feed without invalidating access for other subscribers. Which principle BEST explains the underlying data-engineering risk?

  1. Data sharing controls must cover export and connector capabilities as well as visible charts.
  2. Row-level security can enforce tenant-scoped access when identity and policy design are correct.
  3. Sharing products need subscriber-level lifecycle management and accountable permissions.
  4. Data publication should distinguish certified, governed outputs from exploratory drafts.

Explanation

Correct Answer

C:

Sharing products need subscriber-level lifecycle management and accountable permissions. This principle identifies the relevant workload or governance requirement. The engineer should first examine: Inspect subscriber relationships, listing permissions, audit events, and data ownership. A focused corrective action is: Revoke only the affected subscriber grant and publish versioned replacement guidance.

Incorrect Answers

A:

Data sharing controls must cover export and connector capabilities as well as visible charts. This addresses a different situation: An embedded dashboard lets viewers export all underlying data even though contracts permit only monthly aggregates. The current scenario instead calls for the more directly applicable principle: Sharing products need subscriber-level lifecycle management and accountable permissions. The reason is that sharing products need subscriber-level lifecycle management and accountable permissions.

B:

Row-level security can enforce tenant-scoped access when identity and policy design are correct. This addresses a different situation: A SaaS analytics platform hosts multiple tenant records in one BigQuery table, and users may see only their organization's rows. The current scenario instead calls for the more directly applicable principle: Sharing products need subscriber-level lifecycle management and accountable permissions. The reason is that sharing products need subscriber-level lifecycle management and accountable permissions.

D:

Data publication should distinguish certified, governed outputs from exploratory drafts. This addresses a different situation: A finance department publishes unreviewed experiment tables to the company-wide BI directory and consumers treat them as financial statements. The current scenario instead calls for the more directly applicable principle: Sharing products need subscriber-level lifecycle management and accountable permissions. The reason is that sharing products need subscriber-level lifecycle management and accountable permissions.

Question 361

After applying the change, the team re-examines this condition: An enterprise migrates a high-write transactional database to Google Cloud and cannot afford a long source freeze during cutover. Which result BEST verifies the improvement?

  1. A file modified during migration is represented at its intended final version exactly once.
  2. A changed source record is reflected in the expected warehouse run without a manually copied file.
  3. Critical business reports reconcile in the destination and owners approve the planned cutover.
  4. Post-cutover row and transaction checks agree and application downtime meets its objective.

Explanation

Correct Answer

D:

Post-cutover row and transaction checks agree and application downtime meets its objective. This measures the intended corrected behavior rather than only confirming a setting. Implemented action: Use a supported Database Migration Service path and a rehearsed switchover with reconciliation. Low-downtime database migration needs ongoing change capture, validation, and controlled application switchover.

Incorrect Answers

A:

A file modified during migration is represented at its intended final version exactly once. This addresses a different situation: A partner shares daily updates while an organization copies older archives into a new Cloud Storage lake. The current scenario instead calls for the more directly applicable verification result: Post-cutover row and transaction checks agree and application downtime meets its objective. The reason is that low-downtime database migration needs ongoing change capture, validation, and controlled application switchover.

B:

A changed source record is reflected in the expected warehouse run without a manually copied file. This addresses a different situation: An analytics team needs managed recurring imports from an approved external business SaaS source into BigQuery. The current scenario instead calls for the more directly applicable verification result: Post-cutover row and transaction checks agree and application downtime meets its objective. The reason is that low-downtime database migration needs ongoing change capture, validation, and controlled application switchover.

C:

Critical business reports reconcile in the destination and owners approve the planned cutover. This addresses a different situation: A data team migrates an operational reporting platform without identifying owners of critical reports or their acceptance criteria. The current scenario instead calls for the more directly applicable verification result: Post-cutover row and transaction checks agree and application downtime meets its objective. The reason is that low-downtime database migration needs ongoing change capture, validation, and controlled application switchover.

Question 362

Before modifying the data platform, the team observes: A daily pipeline fails across multiple microservices, but logs cannot connect the initial import to the final BigQuery job. Which evidence should the engineer examine FIRST?

  1. Inspect trace IDs, task run IDs, logging fields, and service timestamps.
  2. Inspect Dataflow watermark, Pub/Sub backlog, worker logs, and sink write latency.
  3. Inspect BigQuery job ID, execution graph, shuffle demand, query text, and error message.
  4. Inspect publisher error codes, quota metrics, topic throughput, and project configuration.

Explanation

Correct Answer

A:

Inspect trace IDs, task run IDs, logging fields, and service timestamps. This evidence directly tests the uncertain part of the described system. End-to-end observability needs stable correlation identifiers and structured telemetry. A controlled response is: Propagate stable pipeline-run identifiers through logs, jobs, and metrics.

Incorrect Answers

B:

Inspect Dataflow watermark, Pub/Sub backlog, worker logs, and sink write latency. This addresses a different situation: A stream's reported job state stays Running while the actual consumer watermark stops moving for twenty minutes. The current scenario instead calls for the more directly applicable investigation: Inspect trace IDs, task run IDs, logging fields, and service timestamps. The reason is that end-to-end observability needs stable correlation identifiers and structured telemetry.

C:

Inspect BigQuery job ID, execution graph, shuffle demand, query text, and error message. This addresses a different situation: A large BigQuery query fails with resources-exceeded errors and the operator sees only a generic dashboard red indicator. The current scenario instead calls for the more directly applicable investigation: Inspect trace IDs, task run IDs, logging fields, and service timestamps. The reason is that end-to-end observability needs stable correlation identifiers and structured telemetry.

D:

Inspect publisher error codes, quota metrics, topic throughput, and project configuration. This addresses a different situation: A burst exceeds Pub/Sub publisher limits and clients receive quota errors, but operations mistake the issue for subscriber crashes. The current scenario instead calls for the more directly applicable investigation: Inspect trace IDs, task run IDs, logging fields, and service timestamps. The reason is that end-to-end observability needs stable correlation identifiers and structured telemetry.

Question 363

After applying the change, the team re-examines this condition: A data scientist overwrites a BigQuery ML model each week and has no record of which training window produced the current predictions. Which result BEST verifies the improvement?

  1. A report viewer sees allowed campaign totals but cannot extract protected customer records.
  2. The same test record produces equivalent engineered features in training and serving paths.
  3. A prior approved model can be reproduced or identified for rollback and comparison.
  4. A sampled scan yields useful searchable passages without leaking protected content.

Explanation

Correct Answer

C:

A prior approved model can be reproduced or identified for rollback and comparison. This measures the intended corrected behavior rather than only confirming a setting. Implemented action: Record versioned model artifacts and approval criteria with reproducible training inputs. Model operations need versioned data, training configuration, evaluation, and promotion records.

Incorrect Answers

A:

A report viewer sees allowed campaign totals but cannot extract protected customer records. This addresses a different situation: A marketing dashboard in Looker Studio displays performance summaries but the configured data source grants unrestricted access to restricted BigQuery customer fields. The current scenario instead calls for the more directly applicable verification result: A prior approved model can be reproduced or identified for rollback and comparison. The reason is that model operations need versioned data, training configuration, evaluation, and promotion records.

B:

The same test record produces equivalent engineered features in training and serving paths. This addresses a different situation: A production model receives categorical values in a format different from the BigQuery ML training transformations. The current scenario instead calls for the more directly applicable verification result: A prior approved model can be reproduced or identified for rollback and comparison. The reason is that model operations need versioned data, training configuration, evaluation, and promotion records.

D:

A sampled scan yields useful searchable passages without leaking protected content. This addresses a different situation: A records team ingests scanned PDFs for semantic search but indexes raw unreadable binary bytes as if they were meaningful text. The current scenario instead calls for the more directly applicable verification result: A prior approved model can be reproduced or identified for rollback and comparison. The reason is that model operations need versioned data, training configuration, evaluation, and promotion records.

Question 364

A Google Cloud architecture review finds: A Dataflow group-by-key stage slows because almost all events share one constant grouping value. Which principle BEST explains the underlying data-engineering risk?

  1. Skewed keys can serialize distributed work and degrade parallel pipeline throughput.
  2. Distributed batch jobs need partitioning that matches data volume and available executor resources.
  3. Retry-safe ELT needs deterministic merge keys and explicit source deduplication.
  4. Ingestion should use explicit schemas where data semantics cannot be inferred reliably.

Explanation

Correct Answer

A:

Skewed keys can serialize distributed work and degrade parallel pipeline throughput. This principle identifies the relevant workload or governance requirement. The engineer should first examine: Inspect per-key counts, worker utilization, fusion stages, and processing backlog. A focused corrective action is: Redesign the aggregation key or introduce valid fan-out patterns where supported.

Incorrect Answers

B:

Distributed batch jobs need partitioning that matches data volume and available executor resources. This addresses a different situation: A Dataproc Spark batch shuffles terabytes into a handful of very large partitions and regularly runs out of memory. The current scenario instead calls for the more directly applicable principle: Skewed keys can serialize distributed work and degrade parallel pipeline throughput. The reason is that skewed keys can serialize distributed work and degrade parallel pipeline throughput.

C:

Retry-safe ELT needs deterministic merge keys and explicit source deduplication. This addresses a different situation: A nightly BigQuery MERGE job occasionally reruns after an orchestrator timeout and inserts duplicate business keys. The current scenario instead calls for the more directly applicable principle: Skewed keys can serialize distributed work and degrade parallel pipeline throughput. The reason is that skewed keys can serialize distributed work and degrade parallel pipeline throughput.

D:

Ingestion should use explicit schemas where data semantics cannot be inferred reliably. This addresses a different situation: An external supplier's CSV columns sometimes contain leading-zero product codes that BigQuery autodetection converts to numeric values. The current scenario instead calls for the more directly applicable principle: Skewed keys can serialize distributed work and degrade parallel pipeline throughput. The reason is that skewed keys can serialize distributed work and degrade parallel pipeline throughput.

Question 365

Before modifying the data platform, the team observes: An analytics team uses LLM-generated BigQuery SQL and executes it immediately against production tables with write privileges. Which evidence should the engineer examine FIRST?

  1. Review source schema, null rates, accepted values, and downstream financial calculations.
  2. Inspect job state, checkpoints, replay source retention, watermarks, and sink write behavior.
  3. Review RPO/RTO requirements, region dependencies, replication design, and backup restoration tests.
  4. Inspect proposed SQL statements, query plans, target datasets, write permissions, and test results.

Explanation

Correct Answer

D:

Inspect proposed SQL statements, query plans, target datasets, write permissions, and test results. This evidence directly tests the uncertain part of the described system. Generated SQL needs explicit validation, permission boundaries, and review before modifying governed data. A controlled response is: Require human-reviewed read-only dry runs and approved execution boundaries for generated queries.

Incorrect Answers

A:

Review source schema, null rates, accepted values, and downstream financial calculations. This addresses a different situation: A nightly sales feed occasionally omits required currency codes, but the current BigQuery load marks every run successful. The current scenario instead calls for the more directly applicable investigation: Inspect proposed SQL statements, query plans, target datasets, write permissions, and test results. The reason is that generated SQL needs explicit validation, permission boundaries, and review before modifying governed data.

B:

Inspect job state, checkpoints, replay source retention, watermarks, and sink write behavior. This addresses a different situation: A six-hour streaming Dataflow job is relaunched after worker failure and loses uncommitted state when operators create a new pipeline without recovery planning. The current scenario instead calls for the more directly applicable investigation: Inspect proposed SQL statements, query plans, target datasets, write permissions, and test results. The reason is that generated SQL needs explicit validation, permission boundaries, and review before modifying governed data.

C:

Review RPO/RTO requirements, region dependencies, replication design, and backup restoration tests. This addresses a different situation: A regional processing failure stops daily regulatory datasets because all staging, computation, and recovery copies reside in one failure domain. The current scenario instead calls for the more directly applicable investigation: Inspect proposed SQL statements, query plans, target datasets, write permissions, and test results. The reason is that generated SQL needs explicit validation, permission boundaries, and review before modifying governed data.

Question 366

Before modifying the data platform, the team observes: A service provider exposes aggregate service quality metrics to customers but must not reveal individual employee work records. Which evidence should the engineer examine FIRST?

  1. Audit embedded viewer roles, export permissions, data source privileges, and contracts.
  2. Inspect SQL aggregation grain, underlying table security, authorized view grants, and customer groups.
  3. Inspect tenant identifiers, user groups, row access policies, and sample access tests.
  4. Inspect subscriber relationships, listing permissions, audit events, and data ownership.

Explanation

Correct Answer

B:

Inspect SQL aggregation grain, underlying table security, authorized view grants, and customer groups. This evidence directly tests the uncertain part of the described system. Authorized views can expose filtered or aggregated analytical data subject to correct permissions. A controlled response is: Publish a reviewed aggregate view with narrowly scoped dataset authorization.

Incorrect Answers

A:

Audit embedded viewer roles, export permissions, data source privileges, and contracts. This addresses a different situation: An embedded dashboard lets viewers export all underlying data even though contracts permit only monthly aggregates. The current scenario instead calls for the more directly applicable investigation: Inspect SQL aggregation grain, underlying table security, authorized view grants, and customer groups. The reason is that authorized views can expose filtered or aggregated analytical data subject to correct permissions.

C:

Inspect tenant identifiers, user groups, row access policies, and sample access tests. This addresses a different situation: A SaaS analytics platform hosts multiple tenant records in one BigQuery table, and users may see only their organization's rows. The current scenario instead calls for the more directly applicable investigation: Inspect SQL aggregation grain, underlying table security, authorized view grants, and customer groups. The reason is that authorized views can expose filtered or aggregated analytical data subject to correct permissions.

D:

Inspect subscriber relationships, listing permissions, audit events, and data ownership. This addresses a different situation: A business data provider wants to revoke a partner's access to an outdated analytics feed without invalidating access for other subscribers. The current scenario instead calls for the more directly applicable investigation: Inspect SQL aggregation grain, underlying table security, authorized view grants, and customer groups. The reason is that authorized views can expose filtered or aggregated analytical data subject to correct permissions.

Question 367

The data engineering team must correct this issue: A managed API intermittently returns 503, causing a multi-step data export workflow to fail permanently without preserving state. Which controlled engineering action is MOST appropriate?

  1. Design tasks with stable run identifiers and safe retries or external deduplication.
  2. Add supported retry conditions and exponential backoff with safe step checkpointing.
  3. Configure the intended time zone and test scheduled execution across relevant date transitions.
  4. Use approved Dataform release configurations and workflow schedules bound to reviewed code.

Explanation

Correct Answer

B:

Add supported retry conditions and exponential backoff with safe step checkpointing. This addresses the specific problem while respecting business and technical constraints. Validate it by checking: A temporary 503 recovers and the export completes once without repeating committed actions. Workflow automation should use bounded backoff and preserve successful prior steps.

Incorrect Answers

A:

Design tasks with stable run identifiers and safe retries or external deduplication. This addresses a different situation: An Airflow DAG reruns after scheduler recovery and reissues the same external billing update twice. The current scenario instead calls for the more directly applicable engineering action: Add supported retry conditions and exponential backoff with safe step checkpointing. The reason is that workflow automation should use bounded backoff and preserve successful prior steps.

C:

Configure the intended time zone and test scheduled execution across relevant date transitions. This addresses a different situation: A daily report must run at 08:00 business time, but the scheduler is configured in UTC and shifts unexpectedly after regional daylight changes. The current scenario instead calls for the more directly applicable engineering action: Add supported retry conditions and exponential backoff with safe step checkpointing. The reason is that workflow automation should use bounded backoff and preserve successful prior steps.

D:

Use approved Dataform release configurations and workflow schedules bound to reviewed code. This addresses a different situation: A production ELT workflow pulls arbitrary local workspace changes without approvals, creating nondeterministic table definitions. The current scenario instead calls for the more directly applicable engineering action: Add supported retry conditions and exponential backoff with safe step checkpointing. The reason is that workflow automation should use bounded backoff and preserve successful prior steps.

Question 368

The data engineering team must correct this issue: A daily fact table receives corrections, but each load recomputes every historical year and causes excessive query cost. Which controlled engineering action is MOST appropriate?

  1. Design governed fact and dimension tables with explicit surrogate or business keys and grain.
  2. Build an incremental partition-aware load with validated late-change reconciliation.
  3. Evaluate a nested repeated line-item representation and write correct UNNEST queries.
  4. Introduce appropriate reservation or workload controls while preserving governance.

Explanation

Correct Answer

B:

Build an incremental partition-aware load with validated late-change reconciliation. This addresses the specific problem while respecting business and technical constraints. Validate it by checking: A small daily update changes only relevant partitions and leaves historical totals correct. Incremental transformations should process only changed partitions where correctness permits.

Incorrect Answers

A:

Design governed fact and dimension tables with explicit surrogate or business keys and grain. This addresses a different situation: A retailer mixes orders, customers, products, and daily inventory measures in one wide duplicated table, making every report join and aggregate inconsistently. The current scenario instead calls for the more directly applicable engineering action: Build an incremental partition-aware load with validated late-change reconciliation. The reason is that incremental transformations should process only changed partitions where correctness permits.

C:

Evaluate a nested repeated line-item representation and write correct UNNEST queries. This addresses a different situation: An events schema contains orders with many line items and analysts often query an order together with its items as one logical document. The current scenario instead calls for the more directly applicable engineering action: Build an incremental partition-aware load with validated late-change reconciliation. The reason is that incremental transformations should process only changed partitions where correctness permits.

D:

Introduce appropriate reservation or workload controls while preserving governance. This addresses a different situation: Interactive analysts share BigQuery capacity with long overnight transformations, causing unpredictable daytime dashboard latencies. The current scenario instead calls for the more directly applicable engineering action: Build an incremental partition-aware load with validated late-change reconciliation. The reason is that incremental transformations should process only changed partitions where correctness permits.

Question 369

Before modifying the data platform, the team observes: A platform has steady high-volume SQL demand but is paying unpredictable per-query cost while finance requires capacity budgets. Which evidence should the engineer examine FIRST?

  1. Inspect BigQuery job statistics, query projections, filters, and data partitions.
  2. Analyze historical slot use, edition features, on-demand costs, and commitment terms.
  3. Review reservation assignments, burst schedule, idle capacity, and job limits.
  4. Inspect queue lag, concurrency controls, reservation usage, and critical event SLAs.

Explanation

Correct Answer

B:

Analyze historical slot use, edition features, on-demand costs, and commitment terms. This evidence directly tests the uncertain part of the described system. Capacity pricing and reservations should be evaluated against measured utilization and service commitments. A controlled response is: Model an appropriate BigQuery Editions capacity reservation with planned commitments.

Incorrect Answers

A:

Inspect BigQuery job statistics, query projections, filters, and data partitions. This addresses a different situation: A reporting application repeatedly runs SELECT star against a wide event table and billing spikes even though it needs five fields. The current scenario instead calls for the more directly applicable investigation: Analyze historical slot use, edition features, on-demand costs, and commitment terms. The reason is that capacity pricing and reservations should be evaluated against measured utilization and service commitments.

C:

Review reservation assignments, burst schedule, idle capacity, and job limits. This addresses a different situation: A data science team needs occasional huge feature-engineering runs but competes with a permanently reserved reporting workload. The current scenario instead calls for the more directly applicable investigation: Analyze historical slot use, edition features, on-demand costs, and commitment terms. The reason is that capacity pricing and reservations should be evaluated against measured utilization and service commitments.

D:

Inspect queue lag, concurrency controls, reservation usage, and critical event SLAs. This addresses a different situation: A payment streaming system is operationally critical, but monthly experimentation triggers heavy resource contention and delayed settlement events. The current scenario instead calls for the more directly applicable investigation: Analyze historical slot use, edition features, on-demand costs, and commitment terms. The reason is that capacity pricing and reservations should be evaluated against measured utilization and service commitments.

Question 370

A Google Cloud data engineer is addressing: An internal data product is advertised as reliable, but consumers receive schema changes and delayed data without notice. Which TWO complementary actions should the team take? Select TWO answers.

  1. Inspect domain contracts, catalog lineage, global policies, and consumer responsibilities.
  2. Review consumer SLAs, schema change history, alerting, and delivery timestamps.
  3. Publish a versioned data contract with quality monitoring and consumer notification.
  4. Establish federated roles and a platform operating model with common policies and domain exceptions.
  5. Implement a governed lakehouse catalog and role model that avoids bypass through raw object access.

Explanation

Correct Answers

B:

Review consumer SLAs, schema change history, alerting, and delivery timestamps. This is the applicable diagnostic investigation. Its complementary step is: Publish a versioned data contract with quality monitoring and consumer notification. Together they address: Published data products need explicit contracts for schemas, freshness, quality, and lifecycle.

C:

Publish a versioned data contract with quality monitoring and consumer notification. This is the applicable controlled engineering response. Its complementary step is: Review consumer SLAs, schema change history, alerting, and delivery timestamps. Together they address: Published data products need explicit contracts for schemas, freshness, quality, and lifecycle.

Incorrect Answers

A:

Inspect domain contracts, catalog lineage, global policies, and consumer responsibilities. This could be useful for another system: Finance and logistics teams publish data independently, but a central team imposes one schema that ignores both domains' definitions. For this situation, the necessary paired decisions are to examine (Review consumer SLAs, schema change history, alerting, and delivery timestamps.) and to implement (Publish a versioned data contract with quality monitoring and consumer notification.).

D:

Establish federated roles and a platform operating model with common policies and domain exceptions. This could be useful for another system: A global enterprise distributes data ownership to regional teams but needs one standard for naming, retention, and access requests. For this situation, the necessary paired decisions are to examine (Review consumer SLAs, schema change history, alerting, and delivery timestamps.) and to implement (Publish a versioned data contract with quality monitoring and consumer notification.).

E:

Implement a governed lakehouse catalog and role model that avoids bypass through raw object access. This could be useful for another system: Data teams use Cloud Storage for open formats and BigQuery for SQL, but each engine applies incompatible permissions to the same sensitive records. For this situation, the necessary paired decisions are to examine (Review consumer SLAs, schema change history, alerting, and delivery timestamps.) and to implement (Publish a versioned data contract with quality monitoring and consumer notification.).

Professional Data Engineer on Google Cloud Platform (Professional Data Engineer) Practice Tests