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Developing AI-Enabled Database Solutions DP-800 Practice Test 76

Question 750

A search UI needs top semantic neighbors at scale without computing a full-table distance expression for every row

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

  1. Use VECTOR_DISTANCE only on compatible vectors with an explicitly chosen metric
  2. Evaluate retrieval precision, recall-at-k and relevance against a labeled question corpus
  3. Evaluate VECTOR_SEARCH with a compatible indexed vector column where supported
  4. Deduplicate by stable document/chunk identity while fusing retrieval rankings

Explanation

Correct Answer

C:

Indexed vector search can avoid an exhaustive scan at the cost of approximate recall and feature constraints.

Incorrect Answers

A:

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

B:

Answer-generation quality cannot reveal all retrieval failures; ranking metrics provide direct measurement.

D:

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

Question 751

An AI service experiences intermittent timeouts and users see silent blank content

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

  1. Every factual assertion in the controlled test can be traced to the corresponding permitted source row
  2. A fixture with exact amounts and dates yields a narrative that matches the underlying SQL calculation
  3. A permitted test call reaches the intended model endpoint and response status is handled explicitly
  4. Injected 429/timeouts cause measured retries and ultimately either success or an explicit safe error

Explanation

Correct Answer

D:

Throttling and transient errors require carefully bounded retry; unbounded retries can exhaust database resources.

Incorrect Answers

A:

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

B:

LLMs are not authoritative for arithmetic or source-of-truth values; database computations should remain deterministic.

C:

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

Question 752

An accounting service must let auditors detect unauthorized alteration of retained ledger data

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

  1. A malformed JSON sample is rejected and a valid sample is accepted without breaking the pipeline
  2. Valid JSON attributes round-trip and invalid required fields are rejected by documented validation rules
  3. A ledger verification detects a controlled unauthorized modification attempt against a trusted digest
  4. An INSERT omitting the field persists the specified default and an explicit valid value is respected

Explanation

Correct Answer

C:

Ledger adds cryptographic evidence for changes, but access governance and external digest retention remain essential.

Incorrect Answers

A:

Checking JSON validity before promotion reduces malformed documents but does not replace application-level schema validation.

B:

JSON storage supports evolving attributes, but constraints and relational columns should still enforce critical business invariants.

D:

A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.

Question 753

A team grants EXECUTE on a procedure and needs to confirm whether callers inherit table access safely

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

  1. JOINing the function to a caller produces the expected rows with a stable execution plan
  2. A low-privilege caller can perform only approved procedure operations and cannot execute arbitrary table updates
  3. Two consumers query the same view and receive consistent authorized columns and predicates
  4. Unit tests compare scalar outputs to known boundary values and query plans avoid unacceptable per-row cost

Explanation

Correct Answer

B:

Stored procedure execution can reduce direct table grants but still needs review of ownership, dynamic SQL, and execution context.

Incorrect Answers

A:

Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.

C:

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

D:

Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.

Question 754

A multitenant application uses one table for several customers and users must see only their tenant rows

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

  1. Grant narrowly scoped EXECUTE on approved modules and avoid unnecessary base-table permissions
  2. Prefer appropriate Microsoft Entra identities and mapped least-privilege database principals
  3. Implement Row-Level Security with an appropriate predicate function and security policy
  4. Use Always Encrypted with client-side key handling and protected column encryption metadata

Explanation

Correct Answer

C:

RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.

Incorrect Answers

A:

Object-level permissions enable task-specific capability without broad exposure to every table.

B:

Centralized identity management reduces shared-secret exposure and improves attribution and revocation.

D:

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

Question 755

A workflow needs exact change keys but does not require the before image of each edited row

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

  1. Evaluate change event streaming on the supported platform and validate its delivery contract
  2. Use hashes or change versions to re-embed only meaningful changed content
  3. Use SQL Change Tracking with persisted synchronization versions for embedding refresh
  4. Implement a reliable incremental embedding maintenance workflow with change capture and retries

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:

Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.

D:

Embedding freshness requires detecting source changes and re-embedding only changed meaningful content.

Question 756

A subscription report needs the previous month's revenue beside each current month

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

  1. Use a correlated scalar subquery for the per-parent aggregate where appropriate
  2. Use LAG with PARTITION BY entity and an explicit time ORDER BY
  3. Use one or more common table expressions preceding the consuming SELECT
  4. Use EDIT_DISTANCE_SIMILARITY where an appropriate bounded similarity metric is required

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

A nonrecursive CTE names a logical result within one statement and does not inherently materialize persistent storage.

D:

Normalized edit similarity can be easier to compare across lengths than raw edit operations, though thresholds must be tuned.

Question 757

A deployment introduces a slower plan for the same SQL text and users report a latency spike

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

  1. Concurrent database updates finish faster and transaction durations fall without breaking atomicity
  2. The regressed query returns identical results with restored acceptable runtime after the approved plan fix
  3. A controlled conflict does not silently overwrite another user's changes and either retries safely or surfaces a conflict
  4. Separate small- and large-tenant workloads both meet latency targets without causing global regressions

Explanation

Correct Answer

B:

Query Store retains plan and runtime history so regressions can be tied to specific plan choices.

Incorrect Answers

A:

Long transactions hold locks and version state, worsening throughput and blocking.

C:

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

D:

A cached plan based on one parameter distribution may be unsuitable for another; forced plans or hints need evidence.

Question 758

A batch-loader needs a procedure to expose a single computed status indicator to its caller

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

  1. An incompatible ALTER is blocked and a compatible planned migration succeeds after updating dependencies
  2. A test principal can query approved columns through the view but cannot query the base table directly
  3. A 200-row test produces 200 correct audit details with no duplicate or missing records
  4. The caller receives the expected parameter value for empty, partial, and full batches

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

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

C:

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

Question 759

Pipeline database credentials are embedded in a public GitHub Actions workflow file

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

  1. Build and deploy a reviewed DACPAC from the SQL Database Project
  2. Move deployment secrets to approved vault or short-lived federation and mask sensitive outputs
  3. Introduce a tested predeployment data remediation with explicit rollback criteria
  4. Require a defined suite of SQL lint/build/test and review checks on schema pull requests

Explanation

Correct Answer

B:

CI/CD credentials are high-value attack targets and should not be stored in repository text.

Incorrect Answers

A:

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

C:

Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.

D:

A successful compiler build is necessary but not sufficient for quality or secure schema changes.

Question 760

A database codebase needs AI suggestions to follow project transaction and migration rules

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

  1. Store reviewed repository-specific instructions in a GitHub Copilot instruction file
  2. Replace raw sensitive values with sanitized schema and sample fixtures before invoking the AI tool
  3. Require parameterized execution and test generated SQL for injection vulnerabilities
  4. Enable appropriate audit logging of AI tool calls, principal, target and result without storing secrets

Explanation

Correct Answer

A:

Instruction files can guide generated suggestions toward local style and safety expectations, but must still be reviewed.

Incorrect Answers

B:

AI-assisted code generation does not waive data classification, retention and exposure restrictions.

C:

Generated SQL must meet normal secure-coding requirements; a model does not sanitize input automatically.

D:

Traceable AI-assisted operations support accountability while logs require access and retention controls.

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

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