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Developing AI-Enabled Database Solutions DP-800 Practice Test 83

Question 820

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

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

  1. Supply vetted schema metadata through a governed read-only tool rather than invent names
  2. Require parameterized execution and test generated SQL for injection vulnerabilities
  3. Verify and configure required Copilot in Fabric tenant, capacity and role prerequisites
  4. Treat retrieved database contents as untrusted data and restrict tools independently of their text

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Grounded schema context helps prevent nonexistent objects but still requires verification of generated SQL.

B:

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

C:

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

Question 821

An embedding worker retries after a timeout and adds a duplicate vector row for the same source version

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

  1. Make embedding writes idempotent using source ID and content/version keys
  2. Use change data capture where supported and manage retention and consumer checkpoints
  3. Use an Azure Function with the supported SQL trigger binding and idempotent handler logic
  4. Store tenant and permission metadata with embeddings and enforce it at query time

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

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

D:

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

Question 822

An AI assistant suggests a query rewrite that looks simpler but may lose a necessary tenant predicate

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

  1. Tenant-isolation tests and result comparisons pass for both authorized and unauthorized identities
  2. An authenticated test can list authorized metadata but cannot enumerate other customers' workspaces
  3. Generated sample changes follow approved conventions and code owners verify deviations explicitly
  4. A test of destructive operations fails while metadata lookup still functions

Explanation

Correct Answer

A:

AI-generated rewrites can silently alter authorization or semantics even if syntactically valid.

Incorrect Answers

B:

AI-tool access should follow user authorization and workspace boundaries rather than tool availability alone.

C:

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

D:

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

Question 823

A data-quality check needs to find rows containing a nonstandard identifier format

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

  1. Use TRY/CATCH with XACT_STATE checks, appropriate rollback, and THROW
  2. Apply REGEXP_LIKE with a tested, appropriately anchored regular expression
  3. Use DENSE_RANK OVER the specified ordering criteria
  4. Use ROW_NUMBER partitioned by the entity and ordered by descending event time with a tie-breaker

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

DENSE_RANK retains equal ranks for ties while the next distinct value advances by one.

D:

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

Question 824

A registration table allows blank mandatory identifiers because no constraints were defined

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

  1. A transaction inserting a nonexistent parent reference fails while a valid parent-child insert commits
  2. Month-filtered plans show partition elimination and the oldest eligible partition is archived safely
  3. Negative weights or forbidden states fail on INSERT/UPDATE and valid values succeed
  4. Attempts to store NULL for a required column fail while optional NULL attributes remain valid

Explanation

Correct Answer

D:

Nullability is a core schema invariant and should not be delegated solely to an API form.

Incorrect Answers

A:

Referential constraints ensure stored relationships point to permitted parent keys and avoid orphan records.

B:

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

C:

Database check predicates reject invalid stored values regardless of which client sent the write.

Question 825

A file naming convention encodes a region token inside a longer value

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

  1. Use REGEXP_SUBSTR with a defined regex to extract the matching segment
  2. Use ROW_NUMBER partitioned by the entity and ordered by descending event time with a tie-breaker
  3. Use JSON_CONTAINS or a supported equivalent JSON membership predicate with correct path semantics
  4. Use REGEXP_COUNT with an appropriate pattern and collation assumptions

Explanation

Correct Answer

A:

REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.

Incorrect Answers

B:

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

C:

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

D:

REGEXP_COUNT returns the number of matches, unlike a boolean REGEXP_LIKE or substring extraction.

Question 826

A rewards board requires tied customers to share a position but no rank gaps

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

  1. Use a correlated NOT EXISTS anti-semi-join to test absence safely
  2. Use SQL graph MATCH patterns over the relevant node and edge tables
  3. Add cycle-aware traversal rules and a tested MAXRECURSION limit where appropriate
  4. Use DENSE_RANK OVER the specified ordering criteria

Explanation

Correct Answer

D:

DENSE_RANK retains equal ranks for ties while the next distinct value advances by one.

Incorrect Answers

A:

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

B:

Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.

C:

Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.

Question 827

An app treats snapshot write-conflict errors as though they can always be silently ignored

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

  1. The execution plan switches to an appropriate index seek with a measured logical-read reduction
  2. A controlled conflict does not silently overwrite another user's changes and either retries safely or surfaces a conflict
  3. The blocker chain clears and normal concurrent transactions finish within the expected latency
  4. The diagnosed operator's observed cost or spill count decreases without changing query results

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

The optimizer may scan without a suitable search path; index keys should reflect frequently filtered columns.

C:

Blocking is caused by incompatible locks; addressing the head blocker is different from killing every waiting request.

D:

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

Question 828

A DAB service exposes endpoints but role names differ from the organization's signed-in identities

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

  1. Configure DAB pagination and documented continuation behavior for the entity
  2. Deploy DAB with environment-specific configuration and managed secret or identity settings
  3. Evaluate Change Event Streaming (CES) where the chosen SQL platform supports it
  4. Map authenticated claims to DAB roles and enforce least-privilege SQL database access

Explanation

Correct Answer

D:

Application identity, API entity permissions and SQL authorization must jointly prevent overbroad access.

Incorrect Answers

A:

Pagination bounds response size and limits database work per request, while stable ordering is essential.

B:

Configuration separation allows consistent entities while credentials and endpoints differ securely across environments.

C:

CES can publish database changes into an event architecture, but supported platform and ordering guarantees must be checked.

Question 829

A search system changes embedding model version while keeping the same table and index

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

  1. Use change data capture where supported and manage retention and consumer checkpoints
  2. Choose semantically useful text fields for embeddings and retain identifiers as filter metadata
  3. Version embedding generation and rebuild or separate incompatible embedding sets
  4. Use scoped identity, sanitized logging and retry metrics for embedding-service calls

Explanation

Correct Answer

C:

Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.

Incorrect Answers

A:

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

B:

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

D:

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

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.

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

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