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Developing AI-Enabled Database Solutions DP-800 Practice Test 51

Question 500

A reconciliation procedure receives an array of keys and should use typed joins rather than string splitting

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

  1. Expose a least-privilege view and grant it instead of broadly granting underlying tables
  2. Wrap the related writes in BEGIN TRANSACTION with TRY/CATCH and appropriate rollback
  3. Use SCHEMABINDING on the appropriate view where stable underlying schema is required
  4. Pass the set with a user-defined table type and table-valued parameter

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

An explicit transaction and consistent failure policy enforce atomicity across multiple statements.

C:

Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.

Question 501

A telemetry report needs one most recent event for each device after applying a time boundary

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

  1. A forced conversion failure leaves no open transaction or partial rows and propagates the intended error
  2. The response preserves the nested structure and passes JSON parsing in the API client
  3. Exactly one newest record is selected for each partition entity, including cases with tied timestamps
  4. A sample array yields one typed row per element and invalid types are handled as designed

Explanation

Correct Answer

C:

Window numbering can select one row per logical partition while a deterministic secondary sort resolves equal timestamps.

Incorrect Answers

A:

Errors can leave a transaction uncommittable; blindly committing from a catch block is unsafe.

B:

JSON_QUERY returns a JSON fragment such as an array/object while JSON_VALUE returns a scalar.

D:

OPENJSON shreds objects or arrays into rows and typed columns when a schema is supplied.

Question 502

An app must extract a specific generated field while rejecting malformed model messages

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

  1. Require answer grounding to retrieved evidence and a safe insufficient-evidence fallback
  2. Parse the external response with supported JSON processing and validate expected response structure
  3. Include stable source identifiers and timestamps with grounded context and render traceable citations
  4. Construct and invoke sp_invoke_external_rest_endpoint with approved request metadata and bounded payload

Explanation

Correct Answer

B:

Model APIs return structured envelopes with status and content fields, which must not be forwarded blindly.

Incorrect Answers

A:

RAG context can be missing or ambiguous; the model must not fill unsupported gaps with invented facts.

C:

Source metadata supports provenance checks and keeps generated statements linked to authorized records.

D:

The stored procedure can call an external REST endpoint under its security/configuration limits; the caller must handle HTTP errors and quotas.

Question 503

A multitenant vector-search pipeline incorrectly applies tenant checks only after selecting top five global neighbors

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

  1. Cross-tenant adversarial tests return only the caller's content while preserving adequate recall
  2. Recall-at-k remains above the threshold while p95 latency falls below the service target
  3. Text search returns expected token matches with lower cost than a leading-wildcard LIKE scan
  4. Known vector pairs produce the expected relative distances and incompatible dimensions are rejected

Explanation

Correct Answer

A:

Late filtering after global top-K can leak unauthorized results or starve legitimate tenant matches.

Incorrect Answers

B:

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

C:

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

D:

Distance calculation requires aligned dimensions and semantics, and metric choice affects ordering.

Question 504

A document retrieval index has confidential columns that ordinary search users must not access

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

  1. CPU use decreases while the returned ranking remains unchanged in a controlled comparison
  2. Test users cannot search or retrieve protected fields while allowed fields remain searchable
  3. A candidate returned by two retrievers is represented once with a consistent fused score
  4. Valid vectors insert and mismatched-dimension input is rejected with a clear error

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Repeated per-query transformation wastes compute when the model and representation are stable.

C:

Duplicate candidates require a deliberate aggregation policy to prevent artificial rank inflation.

D:

SQL vector storage enforces or expects a known dimension and model compatibility for meaningful distance calculations.

Question 505

A release must seed feature flags consistently after publishing a new version of the model

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

  1. Running the deployment twice leaves one expected seed row and the correct feature flags
  2. Boundary and injected-failure test cases pass consistently during CI
  3. A PR that references a nonexistent column fails validation and cannot pass the release gate
  4. An unauthorized PR cannot merge sensitive schema changes without the required owner approval

Explanation

Correct Answer

A:

Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.

Incorrect Answers

B:

Unit tests isolate programmable behavior and catch regression before full integration deployment.

C:

Compilation catches many missing symbols and invalid references before a DACPAC is deployed.

D:

Policy-enforced reviews prevent bypassing designated security and database approvers.

Question 506

A contact import wants to normalize repeated punctuation patterns without hand-written nested REPLACE functions

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

  1. Evaluate JARO_WINKLER_DISTANCE for a name-similarity signal alongside business checks
  2. Use a correlated scalar subquery for the per-parent aggregate where appropriate
  3. Use REGEXP_REPLACE with a carefully tested pattern and replacement string
  4. Use JSON_QUERY for JSON objects or arrays rather than a scalar-extraction function

Explanation

Correct Answer

C:

Regular-expression replacement handles matching text patterns and should be tested for unintended matches.

Incorrect Answers

A:

Jaro-Winkler style similarity rewards matching character patterns and helps with transpositions but cannot prove identity.

B:

A correlated subquery evaluates using the current outer-row key and may be optimized differently from explicit joins.

D:

JSON_QUERY returns a JSON fragment such as an array/object while JSON_VALUE returns a scalar.

Question 507

A team needs recoverability for a schema change that may run while live writes continue

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

  1. Keep reviewed static/reference data as versioned deployment assets with idempotent update logic
  2. Prepare tested backward-compatible rollback or forward-fix procedures and protect data backups
  3. Build and deploy a reviewed DACPAC from the SQL Database Project
  4. Configure appropriate SQL project references and validate external dependencies

Explanation

Correct Answer

B:

Schema rollback can be unsafe after new writes; recoverability must be designed before a high-risk change.

Incorrect Answers

A:

Reference data needs source control and repeatable seed logic, not manual one-off production inserts.

C:

A DACPAC packages the declarative database model used by supported deployment tools.

D:

Project references inform build-time symbol resolution and make schema dependencies explicit.

Question 508

An API procedure catches a conversion error but leaves its transaction open

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

  1. The first row per entity has the expected default or NULL and subsequent rows show the correct predecessor
  2. Good and bad identifier fixtures are classified as expected, including a prefix-only near match
  3. A seeded scores set with ties produces ranks 1,2,2,4 rather than 1,2,2,3
  4. A forced conversion failure leaves no open transaction or partial rows and propagates the intended error

Explanation

Correct Answer

D:

Errors can leave a transaction uncommittable; blindly committing from a catch block is unsafe.

Incorrect Answers

A:

LAG retrieves a preceding row from a window without a self-join, respecting the defined partition and order.

B:

REGEXP_LIKE evaluates a regex match, including anchors that constrain the whole input rather than just a substring.

C:

RANK assigns tied rows the same rank and leaves gaps; DENSE_RANK does not leave gaps.

Question 509

A company automates text synthesis from SQL query results and sends prompts through a model deployed in a different trust region

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

  1. A deployment review confirms prompts remain in approved processing boundaries and logs retain only permitted data
  2. Network payload inspection shows only permitted aggregates/columns and no raw confidential identifiers
  3. Representative queries stay within token budget and still include the labeled answer-bearing chunks
  4. A malicious model response cannot perform a write and only approved validated updates are executed

Explanation

Correct Answer

A:

Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.

Incorrect Answers

B:

Data minimization reduces privacy exposure, inference risk and token costs without impairing the specific answer.

C:

Excess context raises cost, latency and distraction; selective retrieval improves the model's usable evidence.

D:

Model output is untrusted data and must not be treated as authorized executable SQL.

Question 510

An auditing trigger causes nested execution loops when writes to the audit table invoke another trigger

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

  1. Use a view or table-valued function when a relation must participate in JOIN operations
  2. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions
  3. Constrain trigger logic and recursion behavior to prevent unintended reentry
  4. Use SCHEMABINDING on the appropriate view where stable underlying schema is required

Explanation

Correct Answer

C:

Uncontrolled trigger nesting can cause excess DML, recursion failures, and transactional contention.

Incorrect Answers

A:

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

B:

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

D:

Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.

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

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