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Developing AI-Enabled Database Solutions DP-800 Practice Test 26

Question 250

A deployment pipeline needs dependencies to be explicit before changing referenced objects

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

  1. Use SCHEMABINDING on the appropriate view where stable underlying schema is required
  2. Review ownership chaining and module permissions before exposing a privileged stored procedure
  3. Assess a multistatement TVF only when necessary and compare it with an inline TVF
  4. Add SET NOCOUNT ON to a procedure when row-count messages are unnecessary

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

Multistatement TVFs can introduce estimation and optimization limitations, so an inline form is preferred when expressive enough.

D:

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

Question 251

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

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

  1. Seeded three-level reporting lines are returned in the correct hierarchy without infinite recursion
  2. A group with three items yields exactly a valid three-element array in the expected output format
  3. A curated sample establishes higher similarity for intended matches than unrelated names
  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:

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

B:

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

C:

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

Question 252

An application expects country and status reference records across every deployment environment

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

  1. The build resolves referenced objects and fails predictably if an incompatible referenced schema changes
  2. Repeat deployments preserve exactly the approved lookup codes without duplicate rows
  3. The same build artifact deploys to staging and production using explicitly different approved settings
  4. Both old and new app versions pass reads/writes during rollout and final cleanup follows after cutover

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

A consistent schema artifact should be promoted while environment-specific values are provided securely at deployment.

D:

Backward-compatible intermediate schema lets mixed app versions operate safely until a later cleanup.

Question 253

A supervisor report must return departments with no active staff this quarter

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

  1. Use CROSS APPLY or OUTER APPLY with a correlated TOP expression as required by parent retention
  2. Use EDIT_DISTANCE to evaluate edit-operation differences before choosing a threshold
  3. Use a correlated NOT EXISTS anti-semi-join to test absence safely
  4. Use LAG with PARTITION BY entity and an explicit time ORDER BY

Explanation

Correct Answer

C:

NOT EXISTS handles absence checks without the nullable-operand pitfalls that can affect NOT IN.

Incorrect Answers

A:

APPLY evaluates a right-side table expression per outer row and OUTER APPLY retains parents with no matches.

B:

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

D:

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

Question 254

A semantic-search index returns irrelevant matches because it embeds volatile IDs instead of meaningful language

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

  1. A curated query set improves semantic relevance while account filters still enforce boundaries
  2. Replaying an embedding job leaves one vector per intended source version
  3. Representative model outputs insert successfully and validation rejects mismatched vector lengths
  4. Test writes create ordered-enough consumable events and replay handling meets the downstream contract

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

Idempotent update/upsert logic prevents duplicate business vectors during retries and parallel workers.

C:

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

D:

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

Question 255

A SQL Server 2025 vector search experiment needs a graph-like approximate vector index subject to platform support

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

  1. Combine lexical and semantic retrieval in a hybrid search pipeline
  2. Precompute stable vector normalization or compatible index state where supported
  3. Evaluate a supported DiskANN/vector index option with dimension and feature availability checks
  4. Use full-text or exact lexical search appropriate for exact tokens and terms

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

Hybrid retrieval can leverage exact-term precision and vector semantic recall if results are merged sensibly.

B:

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

D:

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

Question 256

An application needs equality searches over protected identifiers while keeping them encrypted to the server

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

  1. Plan Always Encrypted key rotation and re-encryption with a controlled client and validation workflow
  2. Use a suitable SQL column-level encryption mechanism with explicit key lifecycle
  3. Configure Dynamic Data Masking for the least-privileged viewing role
  4. Evaluate deterministic Always Encrypted for explicitly allowed equality operations and leakage tradeoffs

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

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

C:

Dynamic Data Masking changes query presentation for covered low-privilege principals but is not cryptographic encryption.

Question 257

A database contains small static lookup values that must be consistent in dev and production

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

  1. Each production deployment links to the reviewed artifact version and approval record
  2. Boundary and injected-failure test cases pass consistently during CI
  3. Repeat deployments preserve exactly the approved lookup codes without duplicate rows
  4. The app completes representative create/read/update operations against a freshly deployed test database

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

Decoupling build and deploy improves traceability and avoids publishing unreviewed source.

B:

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

D:

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

Question 258

An analytical fact table has millions of rows and dashboards scan and aggregate a few measures

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

  1. Inserts and reads of representative multilingual strings round-trip without replacement characters
  2. Aggregate queries show reduced scanned bytes and improved batch-mode performance under realistic load
  3. An as-of query returns the prior value after a controlled update while current queries return the new value
  4. A permitted cross-source SELECT returns expected rows and failure handling is verified for an unavailable source

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Unicode-capable character types retain characters outside a single legacy code page and require appropriate length planning.

C:

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

D:

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

Question 259

A critical SQL function needs fast repeatable checks for boundary inputs after every edit

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

  1. A failed canary is recovered without losing committed transactions or leaving incompatible schema
  2. An unreviewed branch cannot deploy to production and approved release candidates can
  3. Boundary and injected-failure test cases pass consistently during CI
  4. The build resolves referenced objects and fails predictably if an incompatible referenced schema changes

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

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

Question 260

A service changes the embedding dimension but its SQL vector column has a fixed old dimension

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

  1. Stored vectors match expected dimensions and request logs show the authorized model deployment
  2. Representative model outputs insert successfully and validation rejects mismatched vector lengths
  3. A sequence of updates yields the required event details and can be replayed from a checkpoint
  4. Failures are traceable by request ID while logs exclude secrets and protected document text

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Model hosting and batch generation must align on dimensions, security boundaries and quotas.

C:

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

D:

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

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

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