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Developing AI-Enabled Database Solutions DP-800 Practice Test 48

Question 470

A security report joins the results of several successive calculations without creating physical temp tables

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

  1. The final SELECT returns the approved set while no unwanted permanent table is created
  2. A sample array yields one typed row per element and invalid types are handled as designed
  3. Test documents return expected scalar values and missing paths follow the declared null/error behavior
  4. The first row per entity has the expected default or NULL and subsequent rows show the correct predecessor

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

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

D:

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

Question 471

A project must change customer-managed Always Encrypted keys without losing access to existing rows

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

  1. Old key access can be revoked after authorized clients read all migrated protected records
  2. An unauthorized user cannot read the backup contents and a disaster-recovery drill restores with the proper key
  3. Authorized SQL decryption returns the correct value while permissions block unauthorized key use
  4. An authorized client decrypts selected columns while the database engine account cannot read the plaintext

Explanation

Correct Answer

A:

Column-master and column-encryption key lifecycle must be managed carefully to prevent decryption outages.

Incorrect Answers

B:

Backup encryption protects copies outside the live database, but losing the key can make recovery impossible.

C:

Server-side column encryption is different from Always Encrypted: the engine may decrypt for authorized server operations.

D:

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

Question 472

Two developers edit the same SQL procedure and direct pushes overwrite each other's changes

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

  1. Require a defined suite of SQL lint/build/test and review checks on schema pull requests
  2. Move deployment secrets to approved vault or short-lived federation and mask sensitive outputs
  3. Require feature branches and reviewed pull requests for SQL Database Project edits
  4. Configure deployment triggers and environment approval gates for production

Explanation

Correct Answer

C:

Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.

Incorrect Answers

A:

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

B:

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

D:

CI can build frequently while CD must respect protected environments, approvals and test conditions.

Question 473

A model endpoint returns HTTP 429 during load and the SQL integration treats it as a permanent missing answer

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

  1. Network payload inspection shows only permitted aggregates/columns and no raw confidential identifiers
  2. Injected 429/timeouts cause measured retries and ultimately either success or an explicit safe error
  3. Valid responses yield the intended output string and malformed envelopes cause a controlled error
  4. A cross-tenant test question cannot access or cite another customer's SQL records

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

Retrieval-augmented prompts must not bypass database access controls through backend service identity.

Question 474

An AI answer feature returns relevant passages from neighboring customers because similarity is checked before authorization

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

  1. Restrict indexed/searchable columns and enforce permissions independently of relevance
  2. Evaluate VECTOR_SEARCH with a compatible indexed vector column where supported
  3. Choose an approximate nearest-neighbor index/search path after measuring recall versus latency
  4. Filter by authorization as early as supported in retrieval and never expose unauthorized candidates

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

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

C:

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

Question 475

A payment posting operation must guarantee two related write operations succeed or fail together

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

  1. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions
  2. Wrap the related writes in BEGIN TRANSACTION with TRY/CATCH and appropriate rollback
  3. Expose a least-privilege view and grant it instead of broadly granting underlying tables
  4. Create an appropriately typed scalar function and consider inlining and performance constraints

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

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

Question 476

A team needs controlled model endpoint definitions reusable across approved SQL workflows

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

  1. A test database session resolves the expected model and unauthorized roles cannot invoke it
  2. A test update invokes one logical embedding refresh even when the event is delivered twice
  3. A curated query set improves semantic relevance while account filters still enforce boundaries
  4. Cross-tenant test queries cannot surface protected chunks even when semantic similarity is high

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.

C:

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

D:

Vector similarity does not enforce authorization; retrieval still needs tenant/ACL filters.

Question 477

An automated merge preserves both versions of a SQL object and the build becomes inconsistent

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

  1. An unreviewed branch cannot deploy to production and approved release candidates can
  2. The merged project compiles and integration tests reflect one deliberate schema design
  3. The app completes representative create/read/update operations against a freshly deployed test database
  4. A deliberately invalid PR is blocked by the relevant test or security rule before merge

Explanation

Correct Answer

B:

Text merges may not produce semantically compatible database designs, requiring explicit conflict resolution.

Incorrect Answers

A:

CI can build frequently while CD must respect protected environments, approvals and test conditions.

C:

Build success does not prove connections, permissions, seed data and business workflows work together.

D:

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

Question 478

A document property stores one string customer segment needed by a WHERE filter

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

  1. Use JSON_ARRAYAGG with grouping suited to the required output
  2. Use a recursive CTE with anchor member, recursive member, and safe termination
  3. Use THROW to propagate the original or meaningful custom exception after cleanup
  4. Extract the scalar with JSON_VALUE and use appropriate type conversion and validation

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

JSON_ARRAYAGG aggregates scalar or JSON values into an array, reducing custom string assembly.

B:

Recursive CTEs traverse hierarchies by repeatedly combining results until no new rows are produced.

C:

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

Question 479

An infrastructure review finds SQL clients accepting unvalidated TLS certificates

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

  1. Apply identity authorization and network access as complementary model endpoint controls
  2. Require encrypted database connections and enforce server certificate validation
  3. Use a managed identity or approved token-based authentication for the model endpoint
  4. Encrypt backups with protected keys and test recovery-key availability

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

Backup encryption protects copies outside the live database, but losing the key can make recovery impossible.

Question 480

An UPDATE query scans a large table to find few rows and blocks other writers

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

  1. Capture and inspect the actual execution plan including row counts, join operators and warnings
  2. Improve predicate selectivity and indexing while keeping write-index overhead in check
  3. Use Query Store to compare plan history and evaluate targeted plan forcing or query correction
  4. Investigate parameter sensitivity with Query Store and use an appropriate plan strategy

Explanation

Correct Answer

B:

Efficient row identification can shorten lock holding; excess indexes can slow writes and require balanced tuning.

Incorrect Answers

A:

Actual plans reveal runtime statistics and costly operators that estimated plans alone may not expose.

C:

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

D:

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

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

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