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Certified Data Engineer Professional Practice Test 14

Question 130

A nightly pipeline has parameters for input catalog and destination schema scattered across multiple notebooks.

Which deployment change best meets the operational need?

  1. Separate reusable Python modules and environment-specific configuration in a Declarative Automation Bundle
  2. Deploy immutable versioned artifacts from a single repository revision for each environment
  3. Use service-principal credentials and secret references in deployment configuration rather than embedding tokens
  4. Define typed job parameters and bundle target variables that are injected at deployment or run time

Explanation

Correct Answer

D:

Externalized runtime parameters eliminate duplicated notebooks and keep execution-specific settings reviewable. For this situation, define typed job parameters and bundle target variables that are injected at deployment or run time. The relevant result would be that running each region with its approved inputs produces data only in the corresponding target schema.

Incorrect Answers

A:

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 define typed job parameters and bundle target variables that are injected at deployment or run time.

B:

A recorded build revision makes deployment provenance and rollback deterministic across workspaces. That option implements deploy immutable versioned artifacts from a single repository revision for each environment. It addresses a different problem; here the distinguishing need is to define typed job parameters and bundle target variables that are injected at deployment or run time.

C:

Externalized secrets and least-privileged identities reduce leakage and allow independent credential rotation. That option implements use service-principal credentials and secret references in deployment configuration rather than embedding tokens. It addresses a different problem; here the distinguishing need is to define typed job parameters and bundle target variables that are injected at deployment or run time.

Question 131

A retail report needs complete purchases while looking up descriptive product attributes.

Which reconciliation result most directly verifies the desired semantics?

  1. Post-join row counts reconcile to fact grain and unmatched product keys are reported
  2. Totals equal a reference set of unique transaction IDs and duplicate retry messages add no revenue
  3. A fixture containing customers with and without qualifying purchases yields only the unmatched set
  4. The output contains each expected key exactly once and preserves the agreed data types

Explanation

Correct Answer

A:

This directly verifies the intended outcome: post-join row counts reconcile to fact grain and unmatched product keys are reported. Correct join keys and expected cardinality prevent accidental many-to-many duplication. 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 deduplicate records using a stable transaction identifier before SUM aggregations. Grouping alone sums repeated events unless duplicates are removed at the intended business grain. The specific evidence needed here is that post-join row counts reconcile to fact grain and unmatched product keys are reported.

C:

This would test a different behavior, chiefly use a left anti join with the appropriately filtered successful-event dataset. Left anti joins return left-side entities that have no matching qualifying right-side record. The specific evidence needed here is that post-join row counts reconcile to fact grain and unmatched product keys are reported.

D:

This would test a different behavior, chiefly use a distinct UNION or equivalent set operation and validate schema compatibility. Set union removes duplicates by defined columns whereas UNION ALL retains duplicate rows. The specific evidence needed here is that post-join row counts reconcile to fact grain and unmatched product keys are reported.

Question 132

An e-commerce analytics team requires evidence that the deployed bundle works under its actual service identity.

Which release check establishes the process is controlled?

  1. A clean environment checks out the tagged commit and runs the same tests successfully
  2. A deploy dry run and subsequent deployment succeed under the least-privileged service identity
  3. A drifted task configuration is detected and restored to the approved release state
  4. A release smoke test verifies job dependencies, secret access and expected table writes

Explanation

Correct Answer

D:

This directly verifies the intended outcome: a release smoke test verifies job dependencies, secret access and expected table writes. Source-code unit tests alone cannot prove platform permissions and resource wiring are correct. 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 commit dependency versions alongside source and make CI build a reproducible release artifact. Code and dependency configuration must be versioned together to reproduce task execution. The specific evidence needed here is that a release smoke test verifies job dependencies, secret access and expected table writes.

B:

This would test a different behavior, chiefly grant the deployment principal narrow target-workspace and resource permissions required by the bundle. Git repository access does not itself grant Databricks resource creation rights to CI automation. The specific evidence needed here is that a release smoke test verifies job dependencies, secret access and expected table writes.

C:

This would test a different behavior, chiefly reconcile deployed resource configuration to version-controlled bundle definitions. Declarative deployments establish a reproducible source of truth and reveal manual environment divergence. The specific evidence needed here is that a release smoke test verifies job dependencies, secret access and expected table writes.

Question 133

A customer-activity query is dominated by a single high-volume key during a shuffle join.

Which profile evidence most directly shows the bottleneck improved?

  1. Query profile shows fewer scanned columns and equivalent output on representative data
  2. The long-tail task durations shrink and result totals remain equal to the baseline
  3. Query profile shows broadcast join execution with lower shuffle traffic and correct joined rows
  4. The tuned query uses effective file/data skipping and returns the same cohort records

Explanation

Correct Answer

B:

This directly verifies the intended outcome: the long-tail task durations shrink and result totals remain equal to the baseline. Skew creates a few oversized shuffle partitions that dominate stage completion time. 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 project only required columns early so the optimizer can prune unneeded data. Column pruning reduces data read and memory pressure when the storage format supports it. The specific evidence needed here is that the long-tail task durations shrink and result totals remain equal to the baseline.

C:

This would test a different behavior, chiefly use a broadcast join for an appropriately small and safe dimension when profiling supports it. Broadcasting a small relation avoids a large shuffle join when memory and size constraints allow. The specific evidence needed here is that the long-tail task durations shrink and result totals remain equal to the baseline.

D:

This would test a different behavior, chiefly inspect query profile and file statistics to tune selective predicates and table layout. Poor filter pushdown or clustering can force unnecessary scans even when result cardinality is small. The specific evidence needed here is that the long-tail task durations shrink and result totals remain equal to the baseline.

Question 134

A supply-chain CI worker fails to create a pipeline after switching from a personal token to an automation identity.

Which release check establishes the process is controlled?

  1. Only merged approved commits reach production and the deployed notebook references the release revision
  2. A drifted task configuration is detected and restored to the approved release state
  3. A release smoke test verifies job dependencies, secret access and expected table writes
  4. A deploy dry run and subsequent deployment succeed under the least-privileged service identity

Explanation

Correct Answer

D:

This directly verifies the intended outcome: a deploy dry run and subsequent deployment succeed under the least-privileged service identity. Git repository access does not itself grant Databricks resource creation rights to CI automation. 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 Git folders and a controlled branch-based deployment workflow. Versioned Git integration ties workspace code changes to reviewable commits and release boundaries. The specific evidence needed here is that a deploy dry run and subsequent deployment succeed under the least-privileged service identity.

B:

This would test a different behavior, chiefly reconcile deployed resource configuration to version-controlled bundle definitions. Declarative deployments establish a reproducible source of truth and reveal manual environment divergence. The specific evidence needed here is that a deploy dry run and subsequent deployment succeed under the least-privileged service identity.

C:

This would test a different behavior, chiefly run integration checks in a controlled target environment using the deployment principal and sample data. Source-code unit tests alone cannot prove platform permissions and resource wiring are correct. The specific evidence needed here is that a deploy dry run and subsequent deployment succeed under the least-privileged service identity.

Question 135

A service business needs accounts that have never completed an invoice transaction.

Which reconciliation result most directly verifies the desired semantics?

  1. A fixture containing customers with and without qualifying purchases yields only the unmatched set
  2. For each fact, the result joins at most one dimension version valid at its event time
  3. The output contains each expected key exactly once and preserves the agreed data types
  4. Totals equal a reference set of unique transaction IDs and duplicate retry messages add no revenue

Explanation

Correct Answer

A:

This directly verifies the intended outcome: a fixture containing customers with and without qualifying purchases yields only the unmatched set. Left anti joins return left-side entities that have no matching qualifying right-side record. 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 resolve the intended dimension row per key or effective-time interval before the fact join. Historical dimension versions require point-in-time matching to avoid multiplying facts by all versions. The specific evidence needed here is that a fixture containing customers with and without qualifying purchases yields only the unmatched set.

C:

This would test a different behavior, chiefly use a distinct UNION or equivalent set operation and validate schema compatibility. Set union removes duplicates by defined columns whereas UNION ALL retains duplicate rows. The specific evidence needed here is that a fixture containing customers with and without qualifying purchases yields only the unmatched set.

D:

This would test a different behavior, chiefly deduplicate records using a stable transaction identifier before SUM aggregations. Grouping alone sums repeated events unless duplicates are removed at the intended business grain. The specific evidence needed here is that a fixture containing customers with and without qualifying purchases yields only the unmatched set.

Question 136

A product analytics managed table specifies CLUSTER BY AUTO but does not adapt its layout.

Which maintenance observation supports that choice?

  1. Optimization history shows automatic clustering operations and observed key selections
  2. Ingestion latency improves and table-file distribution stays within defined operating targets
  3. The query profile shows improved skipping and the filtered results remain correct
  4. Freshness is met by pipeline updates and optimization history is assessed separately for scan performance

Explanation

Correct Answer

A:

This directly verifies the intended outcome: optimization history shows automatic clustering operations and observed key selections. Automatic key selection and clustering operations rely on predictive optimization to act on usage patterns. 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 an evidence-based maintenance cadence or platform-managed optimization instead of constant manual full rewrites. Excessive maintenance can contend with ingestion and cost more than the resulting scan benefit. The specific evidence needed here is that optimization history shows automatic clustering operations and observed key selections.

C:

This would test a different behavior, chiefly run or enable the supported statistics collection and optimization process for the managed table. File statistics and layout information help the engine eliminate irrelevant data during queries. The specific evidence needed here is that optimization history shows automatic clustering operations and observed key selections.

D:

This would test a different behavior, chiefly separate freshness SLAs from asynchronous predictive optimization scheduling. Predictive optimization manages physical layout on its own schedule and does not guarantee each insert is immediately reclustered. The specific evidence needed here is that optimization history shows automatic clustering operations and observed key selections.

Question 137

A manufacturing transformation completes on small data but spills and fails under full production input.

Which execution-profile finding would validate the diagnosis?

  1. The bad fixture is identified and appropriate quarantine handling allows valid partitions to complete
  2. The repaired join plan uses intended key conditions and output cardinality matches expectations
  3. After remediation the long-tail tasks shrink and query output remains correct
  4. The corrected job completes at production scale with controlled spill and no executor OOM

Explanation

Correct Answer

D:

This directly verifies the intended outcome: the corrected job completes at production scale with controlled spill and no executor OOM. Execution metrics identify whether memory pressure comes from wide shuffles, skew or configuration. 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 inspect executor logs and Spark UI failed task details to isolate the offending partition and data. Task-level diagnostics provide specific executor exceptions and data locations hidden by the top-level job status. The specific evidence needed here is that the corrected job completes at production scale with controlled spill and no executor OOM.

B:

This would test a different behavior, chiefly inspect the physical plan and query profile to find a missing or incorrect join predicate. An accidental Cartesian product can multiply intermediate rows and dominate cost. The specific evidence needed here is that the corrected job completes at production scale with controlled spill and no executor OOM.

C:

This would test a different behavior, chiefly use Spark UI task timelines and shuffle metrics to isolate skewed partitions before applying a targeted fix. Disproportionate task durations and shuffle bytes reveal skew rather than general CPU scarcity. The specific evidence needed here is that the corrected job completes at production scale with controlled spill and no executor OOM.

Question 138

A security administrator wants to grant analysts access without allowing them to remove mandated ABAC policies.

Which governance or privilege change best fixes the issue?

  1. Transfer ownership to an approved group and review inherited grants in a controlled change
  2. Separate ownership and policy administration through appropriate Unity Catalog roles and policy scopes
  3. Verify and grant required USE CATALOG and USE SCHEMA privileges alongside narrowly scoped SELECT
  4. Audit Unity Catalog privilege inheritance and move broad grants to the intended narrow scope

Explanation

Correct Answer

B:

Governance separation of duties prevents ordinary data stewards from bypassing central data protection. For this situation, separate ownership and policy administration through appropriate Unity Catalog roles and policy scopes. The relevant result would be that a table owner can manage allowed schema changes but cannot disable higher-scope ABAC restrictions.

Incorrect Answers

A:

Group-based ownership supports continuity and separates stewardship from individual employee accounts. That option implements transfer ownership to an approved group and review inherited grants in a controlled change. It addresses a different problem; here the distinguishing need is to separate ownership and policy administration through appropriate Unity Catalog roles and policy scopes.

C:

Unity Catalog queries require applicable path-usage privileges in addition to object-level read grants. That option implements verify and grant required USE CATALOG and USE SCHEMA privileges alongside narrowly scoped SELECT. It addresses a different problem; here the distinguishing need is to separate ownership and policy administration through appropriate Unity Catalog roles and policy scopes.

D:

Privileges at higher securable levels can affect descendant objects and must match the access design. That option implements audit Unity Catalog privilege inheritance and move broad grants to the intended narrow scope. It addresses a different problem; here the distinguishing need is to separate ownership and policy administration through appropriate Unity Catalog roles and policy scopes.

Question 139

A large dimension contains known duplicate keys and a fact join multiplies monetary amounts.

Which join or set-processing design best preserves the data grain?

  1. Use a left anti join with the appropriately filtered successful-event dataset
  2. Use a distinct UNION or equivalent set operation and validate schema compatibility
  3. Resolve the intended dimension row per key or effective-time interval before the fact join
  4. Deduplicate records using a stable transaction identifier before SUM aggregations

Explanation

Correct Answer

C:

Historical dimension versions require point-in-time matching to avoid multiplying facts by all versions. For this situation, resolve the intended dimension row per key or effective-time interval before the fact join. The relevant result would be that for each fact, the result joins at most one dimension version valid at its event time.

Incorrect Answers

A:

Left anti joins return left-side entities that have no matching qualifying right-side record. That option implements use a left anti join with the appropriately filtered successful-event dataset. It addresses a different problem; here the distinguishing need is to resolve the intended dimension row per key or effective-time interval before the fact join.

B:

Set union removes duplicates by defined columns whereas UNION ALL retains duplicate rows. That option implements use a distinct UNION or equivalent set operation and validate schema compatibility. It addresses a different problem; here the distinguishing need is to resolve the intended dimension row per key or effective-time interval before the fact join.

D:

Grouping alone sums repeated events unless duplicates are removed at the intended business grain. That option implements deduplicate records using a stable transaction identifier before SUM aggregations. It addresses a different problem; here the distinguishing need is to resolve the intended dimension row per key or effective-time interval before the fact join.

Question 140

A data engineer applies an AI text function to raw PII and plans to send results to unrestricted analysts.

Which semi-structured or AI-processing design best fits this case?

  1. Extract and cast the required VARIANT path into a validated numeric column with error handling
  2. Redact or minimize sensitive source fields and validate AI-function data-handling permissions before invocation
  3. Parse the nested array and use an explode operation while retaining the parent event identifier
  4. Store flexible semi-structured payloads in a VARIANT column with intentional extraction of queried paths

Explanation

Correct Answer

B:

Model-based enrichment should process only permitted data and must not bypass column protection or compliance requirements. For this situation, redact or minimize sensitive source fields and validate AI-function data-handling permissions before invocation. The relevant result would be that security review shows only approved fields reach the model and unauthorized analysts cannot retrieve raw PII.

Incorrect Answers

A:

Semi-structured values need explicit conversion before trusted numeric aggregations and calculations. That option implements extract and cast the required VARIANT path into a validated numeric column with error handling. It addresses a different problem; here the distinguishing need is to redact or minimize sensitive source fields and validate AI-function data-handling permissions before invocation.

C:

Array expansion creates line-item rows while a parent key preserves source relationship. That option implements parse the nested array and use an explode operation while retaining the parent event identifier. It addresses a different problem; here the distinguishing need is to redact or minimize sensitive source fields and validate AI-function data-handling permissions before invocation.

D:

VARIANT supports evolving semi-structured values while downstream projections can enforce typed contracts. That option implements store flexible semi-structured payloads in a VARIANT column with intentional extraction of queried paths. It addresses a different problem; here the distinguishing need is to redact or minimize sensitive source fields and validate AI-function data-handling permissions before invocation.

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