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Microsoft DP-900 Practice Test 81

Question 800

Architects must choose between file-first and SQL-first Fabric analytics. During testing, the team observes this specific failure: Picking a SQL-first store for raw notebook-only work may cause extra conversions. Which corrective check should be performed FIRST?

  1. Use inactivity-based session windows to group related event sequences.
  2. Track source lineage transformation runs ownership and curated output metadata.
  3. Assume Lakehouse and Warehouse are exactly identical because both use OneLake.
  4. Prototype one Spark pipeline and one reporting query.

Explanation

Correct Answer

D:

Prototype one Spark pipeline and one reporting query. A successful correction should demonstrate that the chosen experience supports required processing and consumption without undue copying.

Incorrect Answers

A:

Use inactivity-based session windows to group related event sequences. It serves Session windows of event activity, not the diagnosed Lakehouse versus Warehouse selection problem. Picking a SQL-first store for raw notebook-only work may cause extra conversions.

B:

Track source lineage transformation runs ownership and curated output metadata. It serves Data governance and lineage for analytics, not the diagnosed Lakehouse versus Warehouse selection problem. Picking a SQL-first store for raw notebook-only work may cause extra conversions.

C:

Assume Lakehouse and Warehouse are exactly identical because both use OneLake. This reinforces the error rather than addressing the Lakehouse versus Warehouse selection failure. Fabric workloads have complementary analytics designs rather than one universal model.

Question 801

A payroll pipeline processes approved files once each night. After selecting the proper Batch scheduled processing approach, which observation gives the clearest evidence of success?

  1. The intended elements and attributes are selected without namespace collisions.
  2. Queries access intended documents efficiently under the chosen API and partition design.
  3. Old reports preserve historical attributes while operational records show current values.
  4. One complete batch produces the intended processed result before the deadline.

Explanation

Correct Answer

D:

One complete batch produces the intended processed result before the deadline. This is the directly observable result for Batch scheduled processing; batch work processes bounded collections at selected times.

Incorrect Answers

A:

The intended elements and attributes are selected without namespace collisions. This supports XML tagged hierarchy, not confirmation of Batch scheduled processing. The relevant evidence is that one complete batch produces the intended processed result before the deadline.

B:

Queries access intended documents efficiently under the chosen API and partition design. This supports Cosmos DB for distributed JSON apps, not confirmation of Batch scheduled processing. The relevant evidence is that one complete batch produces the intended processed result before the deadline.

C:

Old reports preserve historical attributes while operational records show current values. This supports Historical dimensions versus current operational truth, not confirmation of Batch scheduled processing. The relevant evidence is that one complete batch produces the intended processed result before the deadline.

Question 802

A supplier sends purchase orders as nested XML with attributes and namespaces. After selecting the proper XML tagged hierarchy approach, which observation gives the clearest evidence of success?

  1. Old reports preserve historical attributes while operational records show current values.
  2. Downstream reflects tested insert update and delete events in order.
  3. Aggregates group actual status codes rather than arbitrary matching text.
  4. The intended elements and attributes are selected without namespace collisions.

Explanation

Correct Answer

D:

The intended elements and attributes are selected without namespace collisions. This is the directly observable result for XML tagged hierarchy; xML explicitly represents a hierarchy using nested tags and attributes.

Incorrect Answers

A:

Old reports preserve historical attributes while operational records show current values. This supports Historical dimensions versus current operational truth, not confirmation of XML tagged hierarchy. The relevant evidence is that the intended elements and attributes are selected without namespace collisions.

B:

Downstream reflects tested insert update and delete events in order. This supports CDC incremental change propagation, not confirmation of XML tagged hierarchy. The relevant evidence is that the intended elements and attributes are selected without namespace collisions.

C:

Aggregates group actual status codes rather than arbitrary matching text. This supports Log text extraction versus structured event fields, not confirmation of XML tagged hierarchy. The relevant evidence is that the intended elements and attributes are selected without namespace collisions.

Question 803

A DBA must distinguish missing indexes from application network delays. What is the MOST appropriate next validation or correction?

  1. Compare duplicates seasonal patterns and cohorts against the spike.
  2. Check object retrieval and metadata-to-image identity for sampled records.
  3. Compare query plans and before-after latency on test workloads.
  4. Diagnose every SQL timeout by changing a Power BI chart color.

Explanation

Correct Answer

C:

Compare query plans and before-after latency on test workloads. This tests the intended result: rewritten or indexed queries improve measured response safely.

Incorrect Answers

A:

Compare duplicates seasonal patterns and cohorts against the spike. It tests Data analyst anomaly interpretation rather than the critical DBA performance tuning and indexing behavior. DBAs tune database performance as well as maintaining access and reliability.

B:

Check object retrieval and metadata-to-image identity for sampled records. It tests Unstructured image binary files rather than the critical DBA performance tuning and indexing behavior. DBAs tune database performance as well as maintaining access and reliability.

D:

Diagnose every SQL timeout by changing a Power BI chart color. This unsafe shortcut leaves the DBA performance tuning and indexing problem unresolved. Adding random indexes can increase write cost without fixing the bottleneck.

Question 804

User sessions should disappear after a defined duration. Which choice BEST meets this requirement?

  1. Put Expired in a document title and expect automatic deletion.
  2. Select an appropriate redundancy option based on local zone and regional failure requirements.
  3. Consider Cosmos DB for Apache Cassandra with reviewed compatibility.
  4. Configure supported time to live settings for eligible items or containers.

Explanation

Correct Answer

D:

TTL governs data expiration without requiring manual per-item deletes.

Incorrect Answers

A:

Put Expired in a document title and expect automatic deletion. It does not implement Cosmos DB TTL document expiration. Applying TTL to regulated records could violate retention obligations.

B:

Select an appropriate redundancy option based on local zone and regional failure requirements. That action primarily handles Azure Storage LRS ZRS GRS distinctions; the given requirement is Cosmos DB TTL document expiration. TTL governs data expiration without requiring manual per-item deletes.

C:

Consider Cosmos DB for Apache Cassandra with reviewed compatibility. That action primarily handles Cosmos DB API for Apache Cassandra; the given requirement is Cosmos DB TTL document expiration. TTL governs data expiration without requiring manual per-item deletes.

Question 805

Data cleaning is repeatedly performed manually in visuals. What is the MOST appropriate next validation or correction?

  1. Re-run transformations with new sample rows.
  2. Change a chart label from Text to Date and assume Power Query converted every value.
  3. Prototype one Spark pipeline and one reporting query.
  4. Test unique keys and count fact matches per dimension row.

Explanation

Correct Answer

A:

Re-run transformations with new sample rows. This tests the intended result: refresh applies the same cleanup to new records.

Incorrect Answers

B:

Change a chart label from Text to Date and assume Power Query converted every value. This unsafe shortcut leaves the Power Query shaping transformation problem unresolved. Report-level formatting does not correct wrong underlying data types.

C:

Prototype one Spark pipeline and one reporting query. It tests Lakehouse versus Warehouse selection rather than the critical Power Query shaping transformation behavior. Power Query handles data acquisition and shaping before semantic modeling.

D:

Test unique keys and count fact matches per dimension row. It tests One-to-many semantic relationships rather than the critical Power Query shaping transformation behavior. Power Query handles data acquisition and shaping before semantic modeling.

Question 806

A critical dataset must remain available during a zone failure. Which choice BEST meets this requirement?

  1. Choose suitable storage redundancy and separate restore or backup strategy where needed.
  2. Choose explicit text encoding and locale-aware numeric conversion rules.
  3. Consider a lakehouse with governed files and table metadata for mixed engineering and BI workloads.
  4. Count replicated current objects as proof every deleted prior file can be restored.

Explanation

Correct Answer

A:

Replication improves availability but is not always a replacement for recoverable historic versions.

Incorrect Answers

B:

Choose explicit text encoding and locale-aware numeric conversion rules. That action primarily handles Text encoding and numeric parsing; the given requirement is Storage resiliency and replicas. Replication improves availability but is not always a replacement for recoverable historic versions.

C:

Consider a lakehouse with governed files and table metadata for mixed engineering and BI workloads. That action primarily handles Lakehouse for files plus SQL analytics; the given requirement is Storage resiliency and replicas. Replication improves availability but is not always a replacement for recoverable historic versions.

D:

Count replicated current objects as proof every deleted prior file can be restored. It does not implement Storage resiliency and replicas. A replicated accidental deletion may propagate to copies.

Question 807

A lake accepts new log fields without precreating SQL table columns. Which choice BEST meets this requirement?

  1. Claim schema-on-read means data never needs data quality rules.
  2. Store binary images as objects and maintain searchable metadata separately.
  3. Choose schema-on-read for controlled flexible ingestion and schema-on-write for strict transactional validation.
  4. Choose Azure SQL Database PaaS with appropriate compute and resilience settings.

Explanation

Correct Answer

C:

Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.

Incorrect Answers

A:

Claim schema-on-read means data never needs data quality rules. It does not implement Schema-on-read versus schema-on-write. Deferring all validation for payment records can admit unusable transactions.

B:

Store binary images as objects and maintain searchable metadata separately. That action primarily handles Unstructured image binary files; the given requirement is Schema-on-read versus schema-on-write. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.

D:

Choose Azure SQL Database PaaS with appropriate compute and resilience settings. That action primarily handles Azure SQL Database managed relational app; the given requirement is Schema-on-read versus schema-on-write. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.

Question 808

Data engineers keep raw parquet files and need directory-oriented access control. After selecting the proper Azure Data Lake Storage Gen2 analytics landing approach, which observation gives the clearest evidence of success?

  1. Predictions are evaluated against held-out actual outcomes.
  2. Workload tests reflect transaction speed and analytical scans independently.
  3. Analytics engines list intended folders and permissions govern directory access.
  4. Images are retrieved without pretending their visual content is already tabular data.

Explanation

Correct Answer

C:

Analytics engines list intended folders and permissions govern directory access. This is the directly observable result for Azure Data Lake Storage Gen2 analytics landing; aDLS Gen2 adds data-lake semantics on Azure Blob storage.

Incorrect Answers

A:

Predictions are evaluated against held-out actual outcomes. This supports Predictive analytics forecasts, not confirmation of Azure Data Lake Storage Gen2 analytics landing. The relevant evidence is that analytics engines list intended folders and permissions govern directory access.

B:

Workload tests reflect transaction speed and analytical scans independently. This supports Data platform read and write profiles, not confirmation of Azure Data Lake Storage Gen2 analytics landing. The relevant evidence is that analytics engines list intended folders and permissions govern directory access.

D:

Images are retrieved without pretending their visual content is already tabular data. This supports Unstructured image binary files, not confirmation of Azure Data Lake Storage Gen2 analytics landing. The relevant evidence is that analytics engines list intended folders and permissions govern directory access.

Question 809

An operations team wants to transform an Event Hubs feed and send it to multiple destinations. If the relevant Fabric Eventstreams real-time routing safeguard is skipped, which failure is MOST directly associated with that omission?

  1. Joining dimensions directly to many unrelated fact tables can cause ambiguous paths.
  2. Correlation in points alone does not prove one variable caused the other.
  3. Treating an Eventhouse as a SQL Server OLTP endpoint can confuse supported query syntax.
  4. Configuring a source without a destination leaves reports with no live output.

Explanation

Correct Answer

D:

Configuring a source without a destination leaves reports with no live output. Fabric Eventstreams ingest and transform streaming data without necessarily requiring custom code. A suitable check is to send test events through each configured route.

Incorrect Answers

A:

Joining dimensions directly to many unrelated fact tables can cause ambiguous paths. This failure is associated with Star schema report model; it is not the primary failure in the stated Fabric Eventstreams real-time routing scenario. Fabric Eventstreams ingest and transform streaming data without necessarily requiring custom code.

B:

Correlation in points alone does not prove one variable caused the other. This failure is associated with Scatter chart relationship; it is not the primary failure in the stated Fabric Eventstreams real-time routing scenario. Fabric Eventstreams ingest and transform streaming data without necessarily requiring custom code.

C:

Treating an Eventhouse as a SQL Server OLTP endpoint can confuse supported query syntax. This failure is associated with Fabric Eventhouse KQL event analytics; it is not the primary failure in the stated Fabric Eventstreams real-time routing scenario. Fabric Eventstreams ingest and transform streaming data without necessarily requiring custom code.

Question 810

A monitoring dashboard needs disjoint five-minute counts of check-ins. If the relevant Tumbling time windows safeguard is skipped, which failure is MOST directly associated with that omission?

  1. Treating overlapping counts as disjoint totals can double-count dashboard sums.
  2. Assuming Import updates automatically for every new source row leads to stale insights.
  3. Hard-coded manually copied totals become stale when filters change.
  4. Using overlapping hopping windows can count an event in several summaries.

Explanation

Correct Answer

D:

Using overlapping hopping windows can count an event in several summaries. Tumbling windows have contiguous nonoverlapping time intervals. A suitable check is to test events at minute boundaries and compare bucket counts.

Incorrect Answers

A:

Treating overlapping counts as disjoint totals can double-count dashboard sums. This failure is associated with Hopping sliding analytic windows; it is not the primary failure in the stated Tumbling time windows scenario. Tumbling windows have contiguous nonoverlapping time intervals.

B:

Assuming Import updates automatically for every new source row leads to stale insights. This failure is associated with Power BI Import versus DirectQuery mode; it is not the primary failure in the stated Tumbling time windows scenario. Tumbling windows have contiguous nonoverlapping time intervals.

C:

Hard-coded manually copied totals become stale when filters change. This failure is associated with Power BI semantic model measures; it is not the primary failure in the stated Tumbling time windows scenario. Tumbling windows have contiguous nonoverlapping time intervals.

Microsoft Azure Data Fundamentals (DP-900) Practice Tests