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Certified Data Engineer Professional Practice Test 37

Question 360

A factory operations portal has many analysts rereading recently accessed Parquet and Delta files.

Which result proves the targeted optimization without compromising correctness?

  1. Utilization stays within safe limits and the measured run cost falls at the same data volume
  2. Daily compute usage falls substantially while the job still finishes by its deadline
  3. The query scans fewer bytes and finishes sooner without a proportional increase in cluster cost
  4. Repeated workload runs exhibit reduced remote I/O without stale or inconsistent results

Explanation

Correct Answer

D:

This directly verifies the intended outcome: repeated workload runs exhibit reduced remote I/O without stale or inconsistent results. Caching frequently accessed data can avoid repeated remote reads when cache eligibility and capacity permit. Merely seeing a green job status does not establish that the stated business condition holds.

Incorrect Answers

A:

This would test a different behavior, chiefly use measured resource utilization to right-size compute and autoscaling limits. CPU, memory and I/O metrics distinguish undersized compute from overprovisioned idle capacity. The specific evidence needed here is that repeated workload runs exhibit reduced remote I/O without stale or inconsistent results.

B:

This would test a different behavior, chiefly move the scheduled workload to appropriately sized job or serverless compute with automatic lifecycle. On-demand compute removes idle costs while preserving the workload's execution SLA. The specific evidence needed here is that repeated workload runs exhibit reduced remote I/O without stale or inconsistent results.

C:

This would test a different behavior, chiefly fix the access path, predicate and layout before blindly increasing compute size. Scaling compute cannot replace effective data pruning when excessive I/O is the root cause. The specific evidence needed here is that repeated workload runs exhibit reduced remote I/O without stale or inconsistent results.

Question 361

A trading data provider must publish a curated set of fields rather than exposing every internal source column.

Which recipient access result confirms the sharing design?

  1. An approved external client reads permitted shared rows and access remains governed by recipient credentials
  2. The recipient can query allowed shared objects and loses access when the provider revokes the share
  3. The former recipient receives an authorization failure while unaffected approved recipients still query successfully
  4. The recipient sees only the contracted fields and provider changes outside the interface do not leak extra columns

Explanation

Correct Answer

D:

This directly verifies the intended outcome: the recipient sees only the contracted fields and provider changes outside the interface do not leak extra columns. A curated shared interface separates consumer contracts from internal table shape and sensitive columns. Merely seeing a green job status does not establish that the stated business condition holds.

Incorrect Answers

A:

This would test a different behavior, chiefly use Databricks-to-open OpenSharing with an eligible recipient and supported client protocol. Open sharing allows authorized non-Databricks recipients to access shared data through a protocol interface. The specific evidence needed here is that the recipient sees only the contracted fields and provider changes outside the interface do not leak extra columns.

B:

This would test a different behavior, chiefly configure a Databricks-to-Databricks OpenSharing share and recipient for approved assets. D2D sharing exposes provider-controlled current data to an authorized Databricks recipient without manual dataset copies. The specific evidence needed here is that the recipient sees only the contracted fields and provider changes outside the interface do not leak extra columns.

C:

This would test a different behavior, chiefly revoke or update the OpenSharing recipient permissions and verify access is denied. Provider-side recipient control stops future access to shared resources without relying on deleting past exports. The specific evidence needed here is that the recipient sees only the contracted fields and provider changes outside the interface do not leak extra columns.

Question 362

A continuous ingestion job writes tiny Delta files and the gold query gets slower each day.

Which streaming performance change should be prioritized?

  1. Apply appropriate streaming write settings and compaction or managed optimization to control file size
  2. Use supported incremental stateful aggregation with checkpointed progress instead of repeated full historical reads
  3. Configure event-time watermarks and bounded join-state conditions for the business lateness tolerance
  4. Profile the streaming bottleneck and increase sustained processing throughput before tuning the trigger interval

Explanation

Correct Answer

A:

Large numbers of small files add metadata and I/O overhead to downstream scans. For this situation, apply appropriate streaming write settings and compaction or managed optimization to control file size. The relevant result would be that the post-change table shows a healthier file-size distribution and improved query latency.

Incorrect Answers

B:

Incremental processing updates state for new events rather than repeatedly transforming all prior source data. That option implements use supported incremental stateful aggregation with checkpointed progress instead of repeated full historical reads. It addresses a different problem; here the distinguishing need is to apply appropriate streaming write settings and compaction or managed optimization to control file size.

C:

Watermarks allow Spark to evict expired streaming state without discarding permissible late events. That option implements configure event-time watermarks and bounded join-state conditions for the business lateness tolerance. It addresses a different problem; here the distinguishing need is to apply appropriate streaming write settings and compaction or managed optimization to control file size.

D:

Backlog only shrinks when processing capacity exceeds input arrival rate over time. That option implements profile the streaming bottleneck and increase sustained processing throughput before tuning the trigger interval. It addresses a different problem; here the distinguishing need is to apply appropriate streaming write settings and compaction or managed optimization to control file size.

Question 363

A vendor delivers partitioned Parquet objects daily and the team must append only unseen partitions.

Which ingestion or table-interoperability design is most appropriate?

  1. Choose a supported managed table format or compatibility feature matching the required Delta and Iceberg readers
  2. Define schema and quality handling with rescued data or quarantine for incompatible values
  3. Ingest new Parquet batches into a Delta bronze table using incremental file discovery
  4. Write through a supported transactional table interface with catalog governance instead of direct file mutation

Explanation

Correct Answer

C:

An incremental bronze append pattern avoids losing history and reduces unnecessary input rescans. For this situation, ingest new Parquet batches into a Delta bronze table using incremental file discovery. The relevant result would be that two batch runs preserve the first day's rows and append only the next day's partition records.

Incorrect Answers

A:

Table interoperability requires compatible table metadata and readers rather than renaming data files. That option implements choose a supported managed table format or compatibility feature matching the required Delta and Iceberg readers. It addresses a different problem; here the distinguishing need is to ingest new Parquet batches into a Delta bronze table using incremental file discovery.

B:

Explicit schema enforcement and exception capture prevent undetected corruption when source types vary. That option implements define schema and quality handling with rescued data or quarantine for incompatible values. It addresses a different problem; here the distinguishing need is to ingest new Parquet batches into a Delta bronze table using incremental file discovery.

D:

Transactional table formats coordinate commits and metadata to protect readers from partial or conflicting updates. That option implements write through a supported transactional table interface with catalog governance instead of direct file mutation. It addresses a different problem; here the distinguishing need is to ingest new Parquet batches into a Delta bronze table using incremental file discovery.

Question 364

Two departments compute net revenue using different filters and need one authoritative business definition.

Which discoverability or lineage result confirms success?

  1. Catalog search returns the documented authoritative table with clear field meanings and owner contacts
  2. Independent reports resolve to the same approved metric formula and report lineage to its source assets
  3. A metadata query identifies the known confidential columns and newly tagged fields appear without manual lists
  4. The registered data product has an understandable end-to-end lineage and controlled owner identity

Explanation

Correct Answer

B:

This directly verifies the intended outcome: independent reports resolve to the same approved metric formula and report lineage to its source assets. Shared metadata and governed semantic definitions reduce ambiguous KPI interpretation across consumers. Merely seeing a green job status does not establish that the stated business condition holds.

Incorrect Answers

A:

This would test a different behavior, chiefly publish accurate Unity Catalog table and column comments plus ownership metadata for governed datasets. Documented metadata and stewardship improve discoverability and prevent accidental use of the wrong asset. The specific evidence needed here is that independent reports resolve to the same approved metric formula and report lineage to its source assets.

C:

This would test a different behavior, chiefly apply governed classification tags and inspect matching Unity Catalog metadata. Governed tags make classification searchable and reusable for data-discovery and policy automation. The specific evidence needed here is that independent reports resolve to the same approved metric formula and report lineage to its source assets.

D:

This would test a different behavior, chiefly keep governed transformations and registered assets in traceable catalog-managed paths. Catalog lineage is most reliable when supported operations and data assets are governed consistently. The specific evidence needed here is that independent reports resolve to the same approved metric formula and report lineage to its source assets.

Question 365

A nightly data mart job fails in its last aggregation step but source extraction completed successfully.

Which run-history result proves the required orchestration behavior?

  1. The repair history shows the failed task rerun and no duplicate upstream ingestion occurred
  2. Full-reload and incremental test runs each execute only the intended branch and report the selected condition
  3. Task run history shows downstream publication starts only after all required upstream tasks succeed
  4. A forced validation failure launches the incident handler while a successful run skips it

Explanation

Correct Answer

A:

This directly verifies the intended outcome: the repair history shows the failed task rerun and no duplicate upstream ingestion occurred. Lakeflow Job repair preserves eligible successful task results and focuses retry effort on failed work. Merely seeing a green job status does not establish that the stated business condition holds.

Incorrect Answers

B:

This would test a different behavior, chiefly use a Lakeflow Jobs If/Else condition task driven by an explicit job parameter. Conditional orchestration selects a supported branch without duplicating the entire job definition. The specific evidence needed here is that the repair history shows the failed task rerun and no duplicate upstream ingestion occurred.

C:

This would test a different behavior, chiefly create a Lakeflow Job dependency graph with upstream tasks and a downstream publish task. Job task dependencies express ordering and parallelism without timing-based notebook sleeps. The specific evidence needed here is that the repair history shows the failed task rerun and no duplicate upstream ingestion occurred.

D:

This would test a different behavior, chiefly configure task run conditions and notifications for the intended failure path. Job run conditions can trigger follow-up tasks based on upstream outcomes without masking the original failure. The specific evidence needed here is that the repair history shows the failed task rerun and no duplicate upstream ingestion occurred.

Question 366

A service principal can read a repository but cannot deploy a Lakeflow Job because resource creation is denied.

Which source-control or deployment practice best addresses the risk?

  1. Reconcile deployed resource configuration to version-controlled bundle definitions
  2. Grant the deployment principal narrow target-workspace and resource permissions required by the bundle
  3. Use Databricks Git folders and a controlled branch-based deployment workflow
  4. Commit dependency versions alongside source and make CI build a reproducible release artifact

Explanation

Correct Answer

B:

Git repository access does not itself grant Databricks resource creation rights to CI automation. For this situation, grant the deployment principal narrow target-workspace and resource permissions required by the bundle. The relevant result would be that a deploy dry run and subsequent deployment succeed under the least-privileged service identity.

Incorrect Answers

A:

Declarative deployments establish a reproducible source of truth and reveal manual environment divergence. That option implements reconcile deployed resource configuration to version-controlled bundle definitions. It addresses a different problem; here the distinguishing need is to grant the deployment principal narrow target-workspace and resource permissions required by the bundle.

C:

Versioned Git integration ties workspace code changes to reviewable commits and release boundaries. That option implements use Databricks Git folders and a controlled branch-based deployment workflow. It addresses a different problem; here the distinguishing need is to grant the deployment principal narrow target-workspace and resource permissions required by the bundle.

D:

Code and dependency configuration must be versioned together to reproduce task execution. That option implements commit dependency versions alongside source and make CI build a reproducible release artifact. It addresses a different problem; here the distinguishing need is to grant the deployment principal narrow target-workspace and resource permissions required by the bundle.

Question 367

A wheel built by the team imports locally but a Databricks notebook cannot locate its internal module.

Which dependency-management action best prevents this failure?

  1. Check package layout and wheel metadata, then attach a correctly built wheel to the job task
  2. Publish the approved versioned wheel to an authorized artifact location and reference it in job dependencies
  3. Pin the required package version in the workload dependencies and install it in the job environment
  4. Pin and test compatible library versions before promoting a dependency lock change

Explanation

Correct Answer

A:

Python wheel import resolution depends on the packaged module structure and installation into the task environment. For this situation, check package layout and wheel metadata, then attach a correctly built wheel to the job task. The relevant result would be that the wheel installs on clean compute and the scheduled task imports its entry point successfully.

Incorrect Answers

B:

Managed artifact distribution provides traceability without exposing proprietary packages through public repositories. That option implements publish the approved versioned wheel to an authorized artifact location and reference it in job dependencies. It addresses a different problem; here the distinguishing need is to check package layout and wheel metadata, then attach a correctly built wheel to the job task.

C:

Explicit dependencies make fresh ephemeral compute reproducible and avoid relying on an interactive cluster's state. That option implements pin the required package version in the workload dependencies and install it in the job environment. It addresses a different problem; here the distinguishing need is to check package layout and wheel metadata, then attach a correctly built wheel to the job task.

D:

Reproducible dependency resolution prevents unreviewed upstream releases from changing production behavior. That option implements pin and test compatible library versions before promoting a dependency lock change. It addresses a different problem; here the distinguishing need is to check package layout and wheel metadata, then attach a correctly built wheel to the job task.

Question 368

A Databricks task installs conflicting versions of a JSON library from a base environment and a custom wheel.

Which dependency-management action best prevents this failure?

  1. Inspect the package dependency tree and resolve version conflicts in the declared environment
  2. Publish the approved versioned wheel to an authorized artifact location and reference it in job dependencies
  3. Check package layout and wheel metadata, then attach a correctly built wheel to the job task
  4. Pin and test compatible library versions before promoting a dependency lock change

Explanation

Correct Answer

A:

Conflicting transitive requirements must be reconciled rather than hidden by rerunning the same failing installation. For this situation, inspect the package dependency tree and resolve version conflicts in the declared environment. The relevant result would be that fresh environment installation succeeds and dependency checks show a single compatible package graph.

Incorrect Answers

B:

Managed artifact distribution provides traceability without exposing proprietary packages through public repositories. That option implements publish the approved versioned wheel to an authorized artifact location and reference it in job dependencies. It addresses a different problem; here the distinguishing need is to inspect the package dependency tree and resolve version conflicts in the declared environment.

C:

Python wheel import resolution depends on the packaged module structure and installation into the task environment. That option implements check package layout and wheel metadata, then attach a correctly built wheel to the job task. It addresses a different problem; here the distinguishing need is to inspect the package dependency tree and resolve version conflicts in the declared environment.

D:

Reproducible dependency resolution prevents unreviewed upstream releases from changing production behavior. That option implements pin and test compatible library versions before promoting a dependency lock change. It addresses a different problem; here the distinguishing need is to inspect the package dependency tree and resolve version conflicts in the declared environment.

Question 369

A deployment repository mixes notebooks, unit tests and arbitrary wheel builds with no documented package boundary.

Which deployment change best meets the operational need?

  1. Store pipeline code and bundle resource definitions in source control and promote through a reviewed CI/CD pipeline
  2. Define typed job parameters and bundle target variables that are injected at deployment or run time
  3. Package shared Python functions into an importable module with declared dependencies and tests
  4. Separate reusable Python modules and environment-specific configuration in a Declarative Automation Bundle

Explanation

Correct Answer

C:

An importable package decouples business logic from notebook execution contexts and enables reliable unit testing. For this situation, package shared Python functions into an importable module with declared dependencies and tests. The relevant result would be that the module imports in an isolated test run and both jobs execute the same versioned functions.

Incorrect Answers

A:

Versioned code plus declarative resource files support peer review and repeatable deployments instead of manual workspace changes. That option implements store pipeline code and bundle resource definitions in source control and promote through a reviewed CI/CD pipeline. It addresses a different problem; here the distinguishing need is to package shared Python functions into an importable module with declared dependencies and tests.

B:

Externalized runtime parameters eliminate duplicated notebooks and keep execution-specific settings reviewable. That option implements define typed job parameters and bundle target variables that are injected at deployment or run time. It addresses a different problem; here the distinguishing need is to package shared Python functions into an importable module with declared dependencies and tests.

D:

Bundle configuration and modular code make the same tested workload deployable with environment-specific variables. That option implements separate reusable Python modules and environment-specific configuration in a Declarative Automation Bundle. It addresses a different problem; here the distinguishing need is to package shared Python functions into an importable module with declared dependencies and tests.

Question 370

A SaaS lakehouse wants better scan pruning without introducing thousands of tiny tenant partitions.

Which storage or query observation proves the improvement?

  1. The file-count distribution improves and comparable scans show reduced file-open time
  2. Update latency and rewritten bytes decrease while subsequent reads return the correct committed rows
  3. The filtered query scans fewer relevant files and returns the same tenant-specific result
  4. After prescribed retention and purge, prohibited record bytes are no longer accessible through supported historical reads

Explanation

Correct Answer

C:

This directly verifies the intended outcome: the filtered query scans fewer relevant files and returns the same tenant-specific result. Good layout clusters commonly filtered values to improve data skipping without overpartitioning the table. Merely seeing a green job status does not establish that the stated business condition holds.

Incorrect Answers

A:

This would test a different behavior, chiefly optimize the affected Delta table to compact small files into more efficient scan units. File compaction reduces file-opening overhead and improves pruning and read efficiency for many small files. The specific evidence needed here is that the filtered query scans fewer relevant files and returns the same tenant-specific result.

B:

This would test a different behavior, chiefly use a supported Delta table configuration with deletion vectors where appropriate. Deletion vectors can represent row-level modifications without immediately rewriting whole data files. The specific evidence needed here is that the filtered query scans fewer relevant files and returns the same tenant-specific result.

D:

This would test a different behavior, chiefly plan physical data purging and retention-aware cleanup after logical deletion under the supported Delta procedure. Logical delete and deletion vectors do not automatically erase every older physical file or retained version. The specific evidence needed here is that the filtered query scans fewer relevant files and returns the same tenant-specific result.

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