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Developing AI-Enabled Database Solutions DP-800 Practice Test 84

Question 830

A service should execute only a vetted stored procedure, not read the underlying HR table directly

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

  1. Require encrypted database connections and enforce server certificate validation
  2. Evaluate deterministic Always Encrypted for explicitly allowed equality operations and leakage tradeoffs
  3. Grant narrowly scoped EXECUTE on approved modules and avoid unnecessary base-table permissions
  4. Apply identity authorization and network access as complementary model endpoint controls

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

TLS protects data in transit and endpoint verification reduces man-in-the-middle risk.

B:

Deterministic encryption enables equality comparisons for matching plaintexts but reveals equality patterns and is less private than randomized encryption.

D:

Network restrictions limit reachability while scoped credentials decide who can invoke supported operations.

Question 831

A back-office API repeats the same multistep database transaction in different services

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

  1. Create a parameterized stored procedure with explicit transaction and error handling
  2. Use SCHEMABINDING on the appropriate view where stable underlying schema is required
  3. Expose a least-privilege view and grant it instead of broadly granting underlying tables
  4. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions

Explanation

Correct Answer

A:

Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.

Incorrect Answers

B:

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

C:

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

D:

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

Question 832

A prompt-injection string stored in a comment tells the AI coding assistant to export a secrets table

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

  1. Generated sample changes follow approved conventions and code owners verify deviations explicitly
  2. A predeployment check flags the unauthorized DROP operation and blocks deployment
  3. An authorized workspace member can invoke the supported Copilot feature while an excluded role cannot
  4. A seeded malicious comment does not trigger export or additional tool invocation

Explanation

Correct Answer

D:

Prompt injection in tool output must not grant new authority or override the application trust boundary.

Incorrect Answers

A:

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

B:

Natural-language prompts do not guarantee safe SQL, so explicit statement-level approval protects critical schema.

C:

Copilot features depend on administrative eligibility and workspace settings rather than appearing automatically for every user.

Question 833

A vector index is created without considering memory and storage for millions of embeddings

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

  1. Combine structured SQL predicates with vector retrieval using the supported filter strategy
  2. Estimate vector element type, dimensionality and index overhead before sizing storage
  3. Use full-text or exact lexical search appropriate for exact tokens and terms
  4. Restrict indexed/searchable columns and enforce permissions independently of relevance

Explanation

Correct Answer

B:

Vector column dimension and element representation drive base storage and index footprint, not row count alone.

Incorrect Answers

A:

Semantic relevance does not replace mandatory structured filters such as date, category or tenant.

C:

Lexical retrieval is suited to exact symbols and keywords, while semantic vectors may miss exact identifiers.

D:

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

Question 834

An AI data pipeline must replay each insert and update with historical values

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

  1. Register and manage the external model definition with protected endpoint configuration
  2. Align the SQL VECTOR dimension and model version before inserting embeddings
  3. Use change data capture where supported and manage retention and consumer checkpoints
  4. Use a lightweight trigger only to enqueue change identifiers for asynchronous embedding work

Explanation

Correct Answer

C:

CDC captures historical change records from the log, unlike key-only change tracking.

Incorrect Answers

A:

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

B:

A fixed-dimensional vector column cannot store embeddings of an incompatible dimension without schema or model changes.

D:

Synchronous network calls in triggers extend transactions and risk blocking; queueing decouples compute.

Question 835

A background job must roll back a failed multistep write and return a clear database error

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

  1. Use JSON_CONTAINS or a supported equivalent JSON membership predicate with correct path semantics
  2. Use ROW_NUMBER partitioned by the entity and ordered by descending event time with a tie-breaker
  3. Use TRY/CATCH with XACT_STATE checks, appropriate rollback, and THROW
  4. Extract the scalar with JSON_VALUE and use appropriate type conversion and validation

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

JSON membership testing asks whether a value is contained in the target JSON expression rather than extracting one scalar only.

B:

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

D:

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

Question 836

A team connects a database MCP server over the network and wants to prevent unauthenticated external use

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

  1. Create a narrowly scoped read-only identity or role for the assistant's metadata retrieval
  2. Require a focused human diff review and block unapproved destructive statements in the release gate
  3. Select the approved model option and confirm its organizational data controls before sending prompts
  4. Enforce authenticated TLS connections and scoped credentials for the MCP server endpoint

Explanation

Correct Answer

D:

MCP endpoints are service interfaces requiring transport, authentication and authorization controls.

Incorrect Answers

A:

Least privilege reduces the impact of prompt injection, mistaken tool calls and credential disclosure.

B:

Natural-language prompts do not guarantee safe SQL, so explicit statement-level approval protects critical schema.

C:

Model choice affects capability and governance, and prompts must stay within the approved service boundary.

Question 837

A service checks unprocessed work items and ignores the large processed-history portion

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

  1. Representative active-only queries use the filtered index with less IO than a full-table scan
  2. Boundary-value test rows land in the intended partition before the annual rollover job is approved
  3. Month-filtered plans show partition elimination and the oldest eligible partition is archived safely
  4. An approved multi-hop pattern query finds the seeded relationships and rejects absent edges

Explanation

Correct Answer

A:

A predicate-limited index has fewer rows to maintain and can serve a matching selective WHERE clause.

Incorrect Answers

B:

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

C:

Partition elimination can narrow scans and partition switching can simplify retention when indexes align.

D:

Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.

Question 838

A migrated SQL Server workload requires transparent database-file encryption with centralized key management

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

  1. Enable transparent data encryption with appropriate protector and recovery-key handling
  2. Use a managed identity or approved token-based authentication for the model endpoint
  3. Add an appropriate Row-Level Security block predicate for prohibited writes
  4. Require encrypted database connections and enforce server certificate validation

Explanation

Correct Answer

A:

TDE encrypts database files and backups at rest but does not prevent authorized SQL queries from reading plaintext.

Incorrect Answers

B:

Identity-based model calls reduce secret sprawl and allow endpoint permissions to be scoped and revoked.

C:

RLS filter predicates address row visibility while block predicates can stop invalid INSERT/UPDATE operations.

D:

TLS protects data in transit and endpoint verification reduces man-in-the-middle risk.

Question 839

An application must invoke a validated SQL stored procedure through REST while hiding its internal tables

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

  1. A filtered request returns only matching permitted rows and disallowed fields remain inaccessible
  2. A synthetic request can be followed through API and SQL dependency spans using the same trace context
  3. The endpoint invokes only the permitted procedure and rejects unauthorized table writes
  4. The deployed runtime exposes only configured entities and handles expected basic requests

Explanation

Correct Answer

C:

DAB can expose approved programmable objects while caller identity and database permissions enforce access.

Incorrect Answers

A:

API filtering reduces unnecessary result transfer but cannot replace server-side authorization.

B:

Distributed trace correlation helps associate API failures, dependency latency and service operations.

D:

DAB reads configuration to expose chosen database objects as endpoints, subject to role and permission controls.

Question 840

A report filters orders by status and date then returns amount and branch from the same table

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

  1. A permitted cross-source SELECT returns expected rows and failure handling is verified for an unavailable source
  2. Month-filtered plans show partition elimination and the oldest eligible partition is archived safely
  3. The actual plan no longer performs the expensive key lookup for the representative query
  4. Duplicate and NULL primary-key inserts are rejected while valid referenced rows persist

Explanation

Correct Answer

C:

Covering indexes can avoid residual lookups while keeping included attributes out of the search-key ordering.

Incorrect Answers

A:

External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.

B:

Partition elimination can narrow scans and partition switching can simplify retention when indexes align.

D:

A primary key uniquely identifies each row and provides a reference target; its underlying index strategy is a separate design choice.

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

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