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Microsoft PL-300 Practice Test 41

Question 400

A report uses a large fact table containing ten descriptive columns that never appear in measures, relations or visuals. Which action is most appropriate for the stated business outcome?

  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

C:

Column pruning reduces compressed data and scan overhead, supporting smaller model by removing dead columns.

Incorrect Answers

A:

Coarser rows reduce memory while retaining permitted reporting resolution. It would address trim excessive time-series detail, not smaller model by removing dead columns.

B:

Proper normalization of repeated descriptive fields can reduce fact-table redundancy. That targets avoid repeated constant text in fact, not smaller model by removing dead columns.

D:

Integer surrogate keys can improve relationship storage efficiency and lookup performance. It is useful for replacing unwieldy text join keys, not for smaller model by removing dead columns.

Question 401

A composite model joins a remote DirectQuery fact to a tiny dimension frequently used in slicers. Which step should the analyst take?

  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

D:

Dual dimensions can serve cached Import queries and DirectQuery relationships depending on execution context, supporting optimize hybrid model dimensions.

Incorrect Answers

A:

Composite models can incur costly cross-source query behavior. It is useful for reducing federated model execution cost, not for optimize hybrid model dimensions.

B:

Fallback execution can increase latency and change query behavior. Its scope is mitigate Direct Lake query fallback, not optimize hybrid model dimensions.

C:

Local reference data can reduce remote query cost. That is meant for cache slow-changing lookup attributes, not optimize hybrid model dimensions.

Question 402

A captured slow visual uses an inefficient DAX measure and the team needs to inspect the query. Which Power BI approach BEST satisfies the stated requirement?

  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

A:

Captured queries enable isolated query tuning and testing, supporting inspect slow visual DAX expression.

Incorrect Answers

B:

Cross-filter interactions can trigger additional queries and expensive visual updates. That targets reduce interactive report refresh workload, not inspect slow visual DAX expression.

C:

Rendering latency differs from model query latency and needs visual-level remediation. It may suit optimize a slow-rendering chart, not inspect slow visual DAX expression.

D:

Performance Analyzer breaks down time for DAX queries, visual display, and other activity. It is useful for identifying slow report visuals, not for inspecting slow visual DAX expression.

Question 403

A measure returns different totals in different filter contexts and the team needs reproducible probes. What should the report or semantic-model owner do?

  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

B:

Controlled query contexts help diagnose evaluation differences without unrelated visuals, supporting reproduce measure context discrepancies.

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 reproduce measure context discrepancies.

C:

VAR can store expression results within evaluation scope and improve clarity or performance. That is meant for avoid repeated identical DAX subexpressions, not reproduce measure context discrepancies.

D:

Reducing iteration row counts can lower formula-engine work. It would address reduce iterator workload by grouping, not reproduce measure context discrepancies.

Question 404

An event log has millisecond timestamps, but business only filters by calendar day. Which Power BI approach BEST satisfies the stated requirement?

  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

C:

Coarser date values have lower cardinality than millisecond timestamps, supporting compress date-grain reporting fields.

Incorrect Answers

A:

Row pruning reduces compressed storage, refresh work, and scanning. It would address load only needed transaction history, not compress date-grain reporting fields.

B:

Distinct long strings compress poorly and enlarge columnar storage. That targets reduce unnecessary high-cardinality memory, not compress date-grain reporting fields.

D:

Avoiding duplicate key fields saves memory without breaking relationships. It is useful for keeping required keys without redundancy, not for compress date-grain reporting fields.

Question 405

A dashboard requires detailed invoice drillthrough but summary tiles should respond quickly. What should the report or semantic-model owner do?

  1. Keep a separate monthly budget fact at its natural grain.
  2. Preserve data or aggregations at a grain that supports monthly distinct customer calculation.
  3. Use a daily region aggregate at the approved reporting grain.
  4. Implement a supported aggregation strategy retaining details for drillthrough.

Explanation

Correct Answer

D:

Aggregation tables answer summary queries while detailed storage supports exceptions, supporting accelerate summaries without removing drillthrough.

Incorrect Answers

A:

Mixed grains create duplicated values and unnecessary rows. It is useful for avoiding inflated cross-grain monthly totals, not for accelerate summaries without removing drillthrough.

B:

Distinct counts cannot be safely reconstructed by simply summing overlapping daily counts. Its scope is retain accurate nonadditive aggregation semantics, not accelerate summaries without removing drillthrough.

C:

Coarser preaggregation reduces fact row volume for common visuals. That is meant for improve daily regional summary speed, not accelerate summaries without removing drillthrough.

Question 406

An analyst needs to see if a Power Query step can push work to the source database. Which Power BI approach BEST satisfies the stated requirement?

  1. Check Query folding indicators or View Native Query where supported.
  2. Project only required columns and rows at source-compatible folding steps.
  3. Move expensive preparation to an approved upstream dataflow or source ETL layer.
  4. Move foldable date restrictions before the nonfolding transformation.

Explanation

Correct Answer

A:

Folding inspection shows which transformations delegate to the data source, supporting diagnose source query delegation.

Incorrect Answers

B:

Database-side projection avoids unnecessary transfer and model load. That targets minimize imported source fields, not diagnose source query delegation.

C:

Source-side preparation can process large data volumes before Power BI import. It may suit shift heavy nonfoldable preprocessing upstream, not diagnose source query delegation.

D:

Early pushdown reduces rows that must be processed locally. It is useful for preserving database-side date filtering, not for diagnosing source query delegation.

Question 407

One table visual displays 200,000 detailed rows though managers need only top ten transactions. What should the report or semantic-model owner do?

  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

B:

Smaller visual result sets reduce rendering and transfer costs; this helps avoid massive detail table rendering.

Incorrect Answers

A:

Each visual can add query and rendering overhead. It is useful for control excessive page visual count, not for avoiding massive detail table rendering.

C:

Region-level aggregation reduces mark count and visual complexity. That is meant for improve geographic visual responsiveness, not avoid massive detail table rendering.

D:

Native visual rendering may avoid expensive custom drawing behavior. It would address reduce custom visual render bottlenecks, not avoid massive detail table rendering.

Question 408

A complex DirectQuery measure issues too many round trips when multiple filters change rapidly. Which Power BI approach BEST satisfies the stated 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

C:

Reducing requests helps control source load and interactive latency, supporting limit redundant DirectQuery queries.

Incorrect Answers

A:

Aggregate and model design reduce expensive repeated SQL work. It would address simplify complex live-query joins, not limit redundant DirectQuery queries.

B:

DirectQuery performance depends heavily on source query plans and database latency. That targets accelerate frequent source filter queries, not limit redundant DirectQuery queries.

D:

Import trades instantaneous source freshness for compressed in-memory query speed. It is useful for choose cached mode for slow DirectQuery, not for limiting redundant DirectQuery queries.

Question 409

An event fact stores a 64-bit integer key where the proven source range fits a smaller integer type. What should the report or semantic-model owner do?

  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

D:

Narrow valid types can reduce memory and improve processing efficiency, supporting efficient numeric column typing.

Incorrect Answers

A:

Large unique text blobs add memory without supporting measures. It is useful for removing unused unstructured payload, not for efficient numeric column typing.

B:

Duplicate attributes increase memory and metadata overhead. Its scope is avoid redundant materialized columns, not efficient numeric column typing.

C:

Smaller categorical representations can improve dictionary compression. That is meant for optimize repetitive dimension attributes, not efficient numeric column typing.

Question 410

A fact's event timestamp parameter filter does not fold to SQL and incremental refresh fails performance goals. Which Power BI approach BEST satisfies the stated 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

A:

Partition elimination relies on efficient source-filter execution; this helps enable effective incremental refresh pushdown.

Incorrect Answers

B:

Retain and refresh ranges can differ under incremental refresh policies. That targets long history with narrow mutable window, not enable effective incremental refresh pushdown.

C:

Partition management adds unnecessary complexity when source data is tiny. It may suit avoid needless partitions for small lookup, not enable effective incremental refresh pushdown.

D:

Incremental policies limit processing of stable historical partitions. It is useful for avoiding full-history daily reload, not for enabling effective incremental refresh pushdown.


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