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Developing AI-Enabled Database Solutions DP-800 Practice Test 15

Question 140

An employee chain report needs to constrain recursion depth and detect invalid cycles

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. Test documents return expected scalar values and missing paths follow the declared null/error behavior
  2. A cyclic fixture terminates with a controlled error or flagged cycle while valid hierarchies complete
  3. Known similar/dissimilar pairs produce the expected relative edit costs
  4. The caller receives the expected SQL error and the deployment marks the operation failed

Explanation

Correct Answer

B:

Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.

Incorrect Answers

A:

JSON_VALUE reads scalar values at a specified JSON path; non-scalar fragments need a different interface.

C:

Edit distance measures changes required to transform a string and must not be confused with semantic meaning.

D:

THROW provides structured error propagation that callers can handle and prevents false-success status reporting.

Question 141

An API submits an order with hundreds of item IDs and using CSV parsing is slow and error-prone

Which SQL design or implementation decision most directly addresses this requirement?

  1. Pass the set with a user-defined table type and table-valued parameter
  2. Implement a focused AFTER trigger using inserted and deleted logical tables where justified
  3. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions
  4. Expose a least-privilege view and grant it instead of broadly granting underlying tables

Explanation

Correct Answer

A:

TVPs provide typed relational input for multirow procedure operations without ad hoc concatenated SQL.

Incorrect Answers

B:

DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.

C:

T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.

D:

Views can serve as a restricted interface but must be combined with appropriate permissions and row filtering.

Question 142

An equality predicate suddenly has poor cardinality estimates after nightly data import

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. Several comparable test runs show a repeatable performance gain on business-critical queries
  2. The execution plan switches to an appropriate index seek with a measured logical-read reduction
  3. A controlled conflict does not silently overwrite another user's changes and either retries safely or surfaces a conflict
  4. The estimated row count approaches measured rows and representative query elapsed time improves

Explanation

Correct Answer

D:

Statistics provide distribution estimates that influence cardinality and join strategy choices.

Incorrect Answers

A:

Performance changes need controlled before-and-after measurement because cache, concurrency and statistics distort comparisons.

B:

The optimizer may scan without a suitable search path; index keys should reflect frequently filtered columns.

C:

Optimistic versioned isolation can reject overlapping writes, requiring idempotent retry or conflict resolution.

Question 143

A database security audit finds conflicting membership and object permissions

Which SQL design or implementation decision most directly addresses this requirement?

  1. Use Microsoft Entra authentication through a managed identity where the platform supports it
  2. Enable database auditing with the required event groups, destination and retention
  3. Use Always Encrypted with client-side key handling and protected column encryption metadata
  4. Review DENY precedence and remove conflicting grants with a least-privilege role design

Explanation

Correct Answer

D:

A DENY generally overrides an inherited GRANT for an ordinary user; exceptional cases require explicit security review.

Incorrect Answers

A:

Managed identity supplies short-lived identity-based credentials without a long-lived application password.

B:

Auditing generates event evidence of SQL activity but must be configured for relevant actions and protected storage.

C:

Always Encrypted keeps sensitive column values inaccessible to parties lacking client-side keys, unlike server-only encryption at rest.

Question 144

A driver treats incidental DML affected-row messages as separate status events

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. A 200-row test produces 200 correct audit details with no duplicate or missing records
  2. The reusable logic joins with Orders in a single relational query and produces expected results
  3. The caller receives the expected parameter value for empty, partial, and full batches
  4. The client receives the intended result only and the procedure still records actual affected-row counts internally

Explanation

Correct Answer

D:

NOCOUNT suppresses DONEINPROC row-count chatter without changing @@ROWCOUNT semantics.

Incorrect Answers

A:

DML triggers run per statement and inserted/deleted can contain multiple rows; singleton assumptions cause data loss.

B:

Views and TVFs are relational query sources; stored procedures are invoked with EXEC and do not act as arbitrary table expressions.

C:

Procedure output parameters convey scalar results in addition to result sets and return status values.

Question 145

A text search indexes every field including private account notes that should be excluded

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. An approved configuration meets both minimum recall and maximum latency budgets
  2. Test users cannot search or retrieve protected fields while allowed fields remain searchable
  3. A deleted document is absent from search results after the defined update SLA
  4. The index builds on a supported platform and measured recall and latency satisfy requirements

Explanation

Correct Answer

B:

Index membership can make data discoverable; search permission cannot be inferred from index design.

Incorrect Answers

A:

Fast response alone is not sufficient; index parameters shift the speed-quality tradeoff.

C:

Index freshness includes removal as well as addition and edits; stale documents can yield harmful answers.

D:

DiskANN is an approximate-neighbor indexing approach, not a substitute for valid model dimensions and authorization.

Question 146

Different analytics teams repeat the same complex joins to define an approved customer segment

Which SQL design or implementation decision most directly addresses this requirement?

  1. Define an OUTPUT parameter with clear type and set it before returning
  2. Create a view encapsulating the reusable SELECT and grant access to the view as appropriate
  3. Expose a least-privilege view and grant it instead of broadly granting underlying tables
  4. Use an INSTEAD OF trigger only when deliberate view-write translation is required

Explanation

Correct Answer

B:

Views centralize a logical query definition without storing an independent copy of rows by default.

Incorrect Answers

A:

Procedure output parameters convey scalar results in addition to result sets and return status values.

C:

Views can serve as a restricted interface but must be combined with appropriate permissions and row filtering.

D:

INSTEAD OF triggers replace the original DML action and must implement the full intended persistence behavior.

Question 147

An engineer compares text embeddings and observes ranking shifts after changing the distance metric

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. Labeled ranking fixtures confirm the chosen metric produces intended neighbors
  2. A benchmark ranking remains consistent after unit-length normalization for designated test vectors
  3. Recall-at-k remains above the threshold while p95 latency falls below the service target
  4. Text search returns expected token matches with lower cost than a leading-wildcard LIKE scan

Explanation

Correct Answer

A:

Cosine, Euclidean and dot-product measures are not universally interchangeable unless normalization assumptions hold.

Incorrect Answers

B:

Vector normalization removes magnitude effects for certain comparisons but must match model guidance and the intended ranking metric.

C:

ANN reduces work compared with exhaustive distance scanning but may miss some exact nearest vectors.

D:

Full-text indexing supports token-oriented search and ranking beyond simple substring scans.

Question 148

A model endpoint is moved and ingestion errors expose long-lived tokens in application logs

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. Failures are traceable by request ID while logs exclude secrets and protected document text
  2. Image-based fixtures and equivalent text fixtures produce usable grounded outputs within budget
  3. A curated query set improves semantic relevance while account filters still enforce boundaries
  4. A curated multilingual question set retrieves relevant sources in each required language

Explanation

Correct Answer

A:

Operational logs can reveal sensitive source text or access tokens if not carefully configured.

Incorrect Answers

B:

A text-only model cannot directly process raw images, while multimodal inputs require tested format, cost and safety handling.

C:

High-entropy IDs and timestamps add noise to natural-language embeddings; structured filters handle them better.

D:

Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.

Question 149

A rapidly growing events table is nearing an INT identity key limit

Which SQL design or implementation decision most directly addresses this requirement?

  1. Use BIGINT for the high-volume surrogate identifier and validate all referencing columns
  2. Use an appropriate clustered columnstore design for scan-heavy analytics
  3. Implement a system-versioned temporal table with a period and history table
  4. Choose RANGE LEFT or RANGE RIGHT deliberately and test equality at boundary values

Explanation

Correct Answer

A:

A 64-bit integer provides a much larger identifier range; relationships and clients must accept the chosen type.

Incorrect Answers

B:

Columnstore compression and batch execution are effective on broad aggregations; they are not universally best for singleton OLTP updates.

C:

System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.

D:

The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.

Question 150

A lightweight embedding worker must know which SQL records changed since its last checkpoint

After the team applies the intended design, which observation would most directly verify that the specific requirement was met?

  1. Test writes create ordered-enough consumable events and replay handling meets the downstream contract
  2. A new document completes every approved connector step or produces a traceable retry/failure
  3. The worker re-embeds changed rows once and detects an expired checkpoint before losing updates
  4. A test database session resolves the expected model and unauthorized roles cannot invoke it

Explanation

Correct Answer

C:

Change Tracking identifies changed rows efficiently but does not preserve full change history or unlimited retention.

Incorrect Answers

A:

CES integrates supported SQL changes into event consumers; exact guarantees and availability must be checked.

B:

Logic Apps coordinates cross-service actions and retries but does not eliminate the need for idempotency.

D:

A governed model object can centralize endpoint and identity parameters for supported SQL AI operations.

Developing AI-Enabled Database Solutions (DP-800) Practice Tests

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