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Developing AI-Enabled Database Solutions DP-800 Practice Test 18

Question 170

A user requests account details and model context retrieval does not apply database row-level security

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

  1. Handle retryable REST failures with bounded backoff and an explicit failure state
  2. Enforce SQL tenant authorization before building prompts and citations
  3. Check endpoint residency, retention and identity policy before sending SQL-derived model context
  4. Include stable source identifiers and timestamps with grounded context and render traceable citations

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.

D:

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

Question 171

A RAG workflow returns a source link but that source belongs to another tenant

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

  1. Convert approved SQL result fields into a structured JSON object before model invocation
  2. Validate model outputs against source numeric fields and use deterministic SQL for calculations
  3. Limit, rank and trim retrieved context to relevant authorized chunks within token constraints
  4. Enforce SQL tenant authorization before building prompts and citations

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.

B:

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

C:

Excess context raises cost, latency and distraction; selective retrieval improves the model's usable evidence.

Question 172

An analytics query requires one row for each order with a related count of matching line items

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

  1. Use SUM or another aggregate OVER PARTITION BY the grouping key
  2. Use REGEXP_COUNT with an appropriate pattern and collation assumptions
  3. Use CROSS APPLY or OUTER APPLY with a correlated TOP expression as required by parent retention
  4. Use a correlated scalar subquery for the per-parent aggregate where appropriate

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Window aggregates retain detail rows while computing group-level results, unlike GROUP BY which collapses rows.

B:

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

C:

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

Question 173

A database schema publish unexpectedly includes a DROP for a populated legacy table

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

  1. Build logs contain no reusable secret and the pipeline connects under a scoped identity
  2. An unreviewed branch cannot deploy to production and approved release candidates can
  3. A clean checkout builds the expected schema artifact without relying on a developer's local database state
  4. A prohibited DROP is blocked at the release gate and no business table data is lost

Explanation

Correct Answer

D:

Automated schema comparisons may propose destructive changes that need explicit approval and migration planning.

Incorrect Answers

A:

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

B:

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

C:

SQL Database Projects represent schema as versioned declarative artifacts that can be built and validated.

Question 174

A query must combine a local reference table with a dataset kept in an external platform

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

  1. Attempts to store NULL for a required column fail while optional NULL attributes remain valid
  2. A permitted cross-source SELECT returns expected rows and failure handling is verified for an unavailable source
  3. An as-of query returns the prior value after a controlled update while current queries return the new value
  4. A concurrency benchmark demonstrates the required throughput without unacceptable durability or memory side effects

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.

Question 175

A company automates text synthesis from SQL query results and sends prompts through a model deployed in a different trust region

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

  1. Project and aggregate only approved necessary SQL fields before sending model context
  2. Require answer grounding to retrieved evidence and a safe insufficient-evidence fallback
  3. Convert approved SQL result fields into a structured JSON object before model invocation
  4. Check endpoint residency, retention and identity policy before sending SQL-derived model context

Explanation

Correct Answer

D:

Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.

Incorrect Answers

A:

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

B:

RAG context can be missing or ambiguous; the model must not fill unsupported gaps with invented facts.

C:

Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.

Question 176

A customer table must never contain two rows with the same immutable customer identifier

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

  1. Partition the table by an appropriate date key and boundaries with a managed retention plan
  2. Choose RANGE LEFT or RANGE RIGHT deliberately and test equality at boundary values
  3. Define an appropriate PRIMARY KEY with the required uniqueness and nullability semantics
  4. Align the required indexes and partition schemes before partition-switch operations

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

Partition switching has schema and index-alignment prerequisites; an incompatible index can block the metadata operation.

Question 177

An API connects to a database through a plaintext channel on a network with untrusted intermediaries

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

  1. A cross-tenant write is rejected and a same-tenant write succeeds for the same application principal
  2. The connection negotiates verified TLS and rejects an invalid server certificate
  3. Unauthenticated and unauthorized requests are blocked while a least-privilege role reads its permitted entity
  4. A restricted principal cannot query or infer prohibited records under the combined controls

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.

D:

Masking is a presentation control; filtering, permissions, and inference risks remain if users can query too freely.

Question 178

A service fleet needs centralized account revocation and identity-based database access

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

  1. Revoking a test service identity blocks its DB access without disabling unrelated apps
  2. Authorized equality queries find the intended record without disclosing plaintext to the server
  3. Unauthenticated and unauthorized requests are blocked while a least-privilege role reads its permitted entity
  4. Authorized SQL decryption returns the correct value while permissions block unauthorized key use

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.

D:

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

Question 179

A team stores source text without chunk IDs and cannot trace semantic hits back to the original document

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

  1. Persist document IDs, chunk offsets and source version metadata with each vector
  2. Use rank-based fusion or calibrated score normalization before merging lexical and vector results
  3. Filter by authorization as early as supported in retrieval and never expose unauthorized candidates
  4. Normalize vectors when appropriate for the chosen similarity metric

Explanation

Correct Answer

A:

Provenance identifiers are needed for source citation, authorization and update/delete handling.

Incorrect Answers

B:

Raw keyword and vector scores may have different ranges and meanings, so naive addition can bias results.

C:

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

D:

Vector normalization removes magnitude effects for certain comparisons but must match model guidance and the intended ranking metric.

Question 180

A fraud system stores entities and many-to-many relationships that analysts traverse with patterns

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

  1. Concurrent inserts receive distinct generated keys and the application tolerates missing numeric positions
  2. A malformed JSON sample is rejected and a valid sample is accepted without breaking the pipeline
  3. A concurrency benchmark demonstrates the required throughput without unacceptable durability or memory side effects
  4. An approved multi-hop pattern query finds the seeded relationships and rejects absent edges

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.

B:

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

C:

In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.

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

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