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Microsoft PL-300 Practice Test 43

Question 420

A map renders every transaction's GPS coordinate when only regional aggregates are needed. Which implementation best addresses this scenario?

  1. Reduce unnecessary visuals and consolidate metrics into purposeful layouts.
  2. Apply relevant filters and limit displayed detail to analytical needs.
  3. Aggregate locations to region grain before visualizing.
  4. Replace it with an efficient supported native visual where requirements permit.

Explanation

Correct Answer

C:

Region-level aggregation reduces mark count and visual complexity; this helps improve geographic visual responsiveness.

Incorrect Answers

A:

Each visual can add query and rendering overhead. It would address control excessive page visual count, not improve geographic visual responsiveness.

B:

Smaller visual result sets reduce rendering and transfer costs. That targets avoid massive detail table rendering, not improve geographic visual responsiveness.

D:

Native visual rendering may avoid expensive custom drawing behavior. It is useful for reducing custom visual render bottlenecks, not for improving geographic visual responsiveness.

Question 421

A finance report can tolerate an hourly snapshot and performance is consistently worse in DirectQuery. What is the best method for this analysis requirement?

  1. Consider appropriate aggregate tables and simpler dimensional relationships for the source.
  2. Optimize source SQL indexing and predicate design in collaboration with DBAs.
  3. Apply supported query reduction and simplify visual filter interactions.
  4. Move eligible tables to Import with an hourly refresh where governance allows.

Explanation

Correct Answer

D:

Import trades instantaneous source freshness for compressed in-memory query speed, supporting choose cached mode for slow DirectQuery.

Incorrect Answers

A:

Aggregate and model design reduce expensive repeated SQL work. It is useful for simplify complex live-query joins, not for choose cached mode for slow DirectQuery.

B:

DirectQuery performance depends heavily on source query plans and database latency. Its scope is accelerate frequent source filter queries, not choose cached mode for slow DirectQuery.

C:

Reducing requests helps control source load and interactive latency. That is meant for limit redundant DirectQuery queries, not choose cached mode for slow DirectQuery.

Question 422

A fact table stores detailed JSON payloads that are never analyzed after ingestion. Which implementation best addresses this scenario?

  1. Remove the payload column from the final model and retain it in governed source storage.
  2. Eliminate redundant columns after confirming report dependencies.
  3. Use governed categorical codes with suitable encoding and drop unused text fields.
  4. Select a suitable integer type without losing valid values.

Explanation

Correct Answer

A:

Large unique text blobs add memory without supporting measures; this helps remove unused unstructured payload.

Incorrect Answers

B:

Duplicate attributes increase memory and metadata overhead. That targets avoid redundant materialized columns, not remove unused unstructured payload.

C:

Smaller categorical representations can improve dictionary compression. It may suit optimize repetitive dimension attributes, not remove unused unstructured payload.

D:

Narrow valid types can reduce memory and improve processing efficiency. It is useful for efficient numeric column typing, not for removing unused unstructured payload.

Question 423

A company keeps ten years of reports but only one year of changing source events. What is the best method for this analysis requirement?

  1. Align RangeStart and RangeEnd filters with a foldable source predicate.
  2. Partition history with incremental refresh retaining approved archive and refreshing recent periods.
  3. Use ordinary scheduled Import refresh for the small stable dimension.
  4. Configure incremental refresh with appropriate historical and refresh windows.

Explanation

Correct Answer

B:

Retain and refresh ranges can differ under incremental refresh policies, supporting long history with narrow mutable window.

Incorrect Answers

A:

Partition elimination relies on efficient source-filter execution. It is useful for enabling effective incremental refresh pushdown, not for long history with narrow mutable window.

C:

Partition management adds unnecessary complexity when source data is tiny. That is meant for avoid needless partitions for small lookup, not long history with narrow mutable window.

D:

Incremental policies limit processing of stable historical partitions. It would address avoid full-history daily reload, not long history with narrow mutable window.

Question 424

A measure builds a temporary huge crossjoin when it only needs groups with existing fact rows. Which implementation best addresses this scenario?

  1. Replace redundant SUMX over a stored scalar with SUM when semantics match.
  2. Store the intermediate filtered result or scalar in a DAX VAR.
  3. Reduce the virtual table to the necessary grain and avoid unnecessary cartesian products.
  4. Move stable classification upstream and filter the dimension.

Explanation

Correct Answer

C:

Large intermediate tables can consume computation without changing business results; this helps avoid large unnecessary virtual cartesian sets.

Incorrect Answers

A:

A simple column aggregation can avoid unnecessary row-wise formula evaluation. It would address efficient simple additive sum, not avoid large unnecessary virtual cartesian sets.

B:

Variables promote reuse and make repeated expressions easier to optimize. That targets reduce redundant expression evaluation, not avoid large unnecessary virtual cartesian sets.

D:

Dimension predicates and precomputed stable attributes can simplify runtime DAX. It is useful for replacing repeated runtime text scanning, not for avoiding large unnecessary virtual cartesian sets.

Question 425

A report refresh fails due to Power Query step evaluation, but interactive model measures are fast. What is the best method for this analysis requirement?

  1. Analyze source database contention and query concurrency.
  2. Capture the interaction with Performance Analyzer and compare time components.
  3. Optimize or replace the client-side visual rather than retuning DAX blindly.
  4. Profile Power Query refresh steps and upstream source performance.

Explanation

Correct Answer

D:

Refresh transformation time is a different stage than visual query execution, supporting diagnose ingestion bottleneck rather than DAX.

Incorrect Answers

A:

Remote database resource limits can dominate DirectQuery responsiveness. It is useful for trace source-side live query latency, not for diagnosing ingestion bottleneck rather than DAX.

B:

Distinct query and rendering timings point to different remediation paths. Its scope is distinguish backend query from visual rendering, not diagnose ingestion bottleneck rather than DAX.

C:

Rendering bottlenecks can exist even with efficient backend query evaluation. That is meant for resolve client-side visual slowness, not diagnose ingestion bottleneck rather than DAX.

Question 426

A trend report needs only weekly aggregates but includes full minute-level sensor data in the semantic model. Which implementation best addresses this scenario?

  1. Aggregate the source to a validated weekly grain before loading.
  2. Move stable organization descriptors into a separate dimension table.
  3. Remove unneeded fact columns before model load.
  4. Use the stable integer surrogate key where compatibility is verified.

Explanation

Correct Answer

A:

Coarser rows reduce memory while retaining permitted reporting resolution, supporting trim excessive time-series detail.

Incorrect Answers

B:

Proper normalization of repeated descriptive fields can reduce fact-table redundancy. That targets avoid repeated constant text in fact, not trim excessive time-series detail.

C:

Column pruning reduces compressed data and scan overhead. It may suit smaller model by removing dead columns, not trim excessive time-series detail.

D:

Integer surrogate keys can improve relationship storage efficiency and lookup performance. It is useful for replacing unwieldy text join keys, not for trim excessive time-series detail.

Question 427

A model uses Direct Lake over supported Fabric tables but frequently falls back to DirectQuery due to unsupported queries. What is the best method for this analysis requirement?

  1. Reduce unnecessary cross-source joins and align data to compatible storage where feasible.
  2. Investigate Direct Lake fallback causes and adjust model/data prerequisites.
  3. Cache the dimension through an appropriate Import or Dual storage strategy.
  4. Consider Dual storage mode for a supported dimension where appropriate.

Explanation

Correct Answer

B:

Fallback execution can increase latency and change query behavior, supporting mitigate Direct Lake query fallback.

Incorrect Answers

A:

Composite models can incur costly cross-source query behavior. It is useful for reducing federated model execution cost, not for mitigate Direct Lake query fallback.

C:

Local reference data can reduce remote query cost. That is meant for cache slow-changing lookup attributes, not mitigate Direct Lake query fallback.

D:

Dual dimensions can serve cached Import queries and DirectQuery relationships depending on execution context. It would address optimize hybrid model dimensions, not mitigate Direct Lake query fallback.

Question 428

A chart spends little time querying but takes excessive time rendering complex marks. Which configuration should the team choose?

  1. Copy the visual query from Performance Analyzer into a supported DAX query tool.
  2. Measure visual interactions and simplify unnecessary cross-highlighting.
  3. Simplify its visual design and reduce plotted marks or formatting overhead.
  4. Use Performance Analyzer to capture visual execution durations.

Explanation

Correct Answer

C:

Rendering latency differs from model query latency and needs visual-level remediation, supporting optimize a slow-rendering chart.

Incorrect Answers

A:

Captured queries enable isolated query tuning and testing. It would address inspect slow visual DAX expression, not optimize a slow-rendering chart.

B:

Cross-filter interactions can trigger additional queries and expensive visual updates. That targets reduce interactive report refresh workload, not optimize a slow-rendering chart.

D:

Performance Analyzer breaks down time for DAX queries, visual display, and other activity. It is useful for identifying slow report visuals, not for optimize a slow-rendering chart.

Question 429

A slow row iterator traverses a very large table even though a pre-aggregation meets business requirements. What is the MOST appropriate Power BI design decision?

  1. Use DAX query view to evaluate targeted EVALUATE statements.
  2. Execute DAX queries that explicitly set the corresponding filter context.
  3. Refactor DAX using variables for reused intermediate expressions.
  4. Aggregate at the correct grain before heavy row-wise calculation.

Explanation

Correct Answer

D:

Reducing iteration row counts can lower formula-engine work; this helps reduce iterator workload by grouping.

Incorrect Answers

A:

DAX query view supports focused testing and inspection of DAX result sets. It is useful for isolate DAX query behavior, not for reducing iterator workload by grouping.

B:

Controlled query contexts help diagnose evaluation differences without unrelated visuals. Its scope is reproduce measure context discrepancies, not reduce iterator workload by grouping.

C:

VAR can store expression results within evaluation scope and improve clarity or performance. That is meant for avoid repeated identical DAX subexpressions, not reduce iterator workload by grouping.

Question 430

A report needs only two years of transactions but the source query loads ten years into memory. Which configuration should the team choose?

  1. Filter historical rows to the approved reporting horizon upstream.
  2. Remove unused high-cardinality text columns before Import.
  3. Derive a day-grain column and omit unneeded high-precision timestamp where allowed.
  4. Retain necessary keys but hide them and remove any redundant copies.

Explanation

Correct Answer

A:

Row pruning reduces compressed storage, refresh work, and scanning, supporting load only needed transaction history.

Incorrect Answers

B:

Distinct long strings compress poorly and enlarge columnar storage. That targets reduce unnecessary high-cardinality memory, not load only needed transaction history.

C:

Coarser date values have lower cardinality than millisecond timestamps. It may suit compress date-grain reporting fields, not load only needed transaction history.

D:

Avoiding duplicate key fields saves memory without breaking relationships. It is useful for keeping required keys without redundancy, not for load only needed transaction history.


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