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Developing AI-Enabled Database Solutions DP-800 Practice Test 3

Question 20

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

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

  1. Store monetary calculations in a suitably sized DECIMAL with an explicit scale
  2. Model related entities with graph node and edge tables where graph traversal is required
  3. Use ledger-capable tables with digest verification suited to the retention policy
  4. Validate the JSON payload at the database boundary with ISJSON and related constraints where supported

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Approximate binary floating-point types cannot represent every decimal currency value exactly; fixed-precision decimal arithmetic avoids that category of rounding error.

C:

Ledger adds cryptographic evidence for changes, but access governance and external digest retention remain essential.

D:

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

Question 21

A global product-help index must find semantically similar phrases across several languages

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

  1. Cross-tenant test queries cannot surface protected chunks even when semantic similarity is high
  2. Replaying an embedding job leaves one vector per intended source version
  3. A curated multilingual question set retrieves relevant sources in each required language
  4. A controlled product edit appears in semantic search within the agreed freshness window

Explanation

Correct Answer

C:

Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.

Incorrect Answers

A:

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

B:

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

D:

Embedding freshness requires detecting source changes and re-embedding only changed meaningful content.

Question 22

A security team assumes an AI model endpoint's network isolation automatically controls callers

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

  1. Replace broad role membership with custom least-privilege grants for the required objects
  2. Use Microsoft Entra authentication through a managed identity where the platform supports it
  3. Require encrypted database connections and enforce server certificate validation
  4. Apply identity authorization and network access as complementary model endpoint controls

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Overprivileged built-in roles broaden the blast radius of compromises and accidental statements.

B:

Managed identity supplies short-lived identity-based credentials without a long-lived application password.

C:

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

Question 23

A document-search service receives images of receipts and plain text invoices but the chosen model accepts only text

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

  1. Evaluate a multimodal model with supported image/text inputs for the required task
  2. Use an Azure Function with the supported SQL trigger binding and idempotent handler logic
  3. Use a lightweight trigger only to enqueue change identifiers for asynchronous embedding work
  4. Use change data capture where supported and manage retention and consumer checkpoints

Explanation

Correct Answer

A:

A text-only model cannot directly process raw images, while multimodal inputs require tested format, cost and safety handling.

Incorrect Answers

B:

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

C:

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

D:

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

Question 24

An analytics portal queries shared invoice data and needs tenant boundaries enforced independent of application filters

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

  1. Both an unapproved network source and an unauthorized identity fail independently
  2. A sample inventory maps confidential columns to approved policies and restricted roles
  3. Sequential tests from two tenants on a reused connection never return the first tenant's data to the second
  4. Two test identities see only their own tenant rows, including queries that omit client-side tenant filters

Explanation

Correct Answer

D:

RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.

Incorrect Answers

A:

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

B:

Information classification guides which columns require stricter access, masking, encryption and auditing.

C:

RLS predicates must receive authenticated tenant context and connection pooling can retain session state unless managed.

Question 25

A poorly selected update index increases lock duration and write contention on a hot table

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. Several comparable test runs show a repeatable performance gain on business-critical queries
  3. The blocker chain clears and normal concurrent transactions finish within the expected latency
  4. A concurrency benchmark shows fewer blocked writers and acceptable insert/update throughput

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

Performance changes need controlled before-and-after measurement because cache, concurrency and statistics distort comparisons.

C:

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

Question 26

Data owners must prioritize encryption, retention and restricted access for the most sensitive SQL columns

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

  1. Classify sensitive fields and align protections with their policy requirements
  2. Add an appropriate Row-Level Security block predicate for prohibited writes
  3. Prefer appropriate Microsoft Entra identities and mapped least-privilege database principals
  4. Constrain MCP tools to allowlisted operations and privileged actions to explicit human authorization

Explanation

Correct Answer

A:

Information classification guides which columns require stricter access, masking, encryption and auditing.

Incorrect Answers

B:

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

C:

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

D:

Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.

Question 27

A DACPAC publisher uses a shared administrative password in raw CI logs

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

  1. Repeat deployments preserve exactly the approved lookup codes without duplicate rows
  2. An authorized workflow gets short-lived credentials and unauthorized repository branches cannot assume the role
  3. Build logs contain no reusable secret and the pipeline connects under a scoped identity
  4. Running the deployment twice leaves one expected seed row and the correct feature flags

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.

D:

Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.

Question 28

A SQL workload reports intermittent latency with high wait durations but normal CPU averages

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

  1. The estimated row count approaches measured rows and representative query elapsed time improves
  2. The diagnosed operator's observed cost or spill count decreases without changing query results
  3. Samples identify a repeatable dominant wait category linked to the tested slowdown
  4. Concurrent database updates finish faster and transaction durations fall without breaking atomicity

Explanation

Correct Answer

C:

DMVs expose current and cumulative SQL diagnostics that help distinguish contention from capacity or query-plan issues.

Incorrect Answers

A:

Statistics provide distribution estimates that influence cardinality and join strategy choices.

B:

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

D:

Long transactions hold locks and version state, worsening throughput and blocking.

Question 29

Different analytics teams repeat the same complex joins to define an approved customer segment

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

  1. Function calls within SELECT produce deterministic outputs without changing database state
  2. The client receives the intended result only and the procedure still records actual affected-row counts internally
  3. The caller receives the expected parameter value for empty, partial, and full batches
  4. Two consumers query the same view and receive consistent authorized columns and predicates

Explanation

Correct Answer

D:

Views centralize a logical query definition without storing an independent copy of rows by default.

Incorrect Answers

A:

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

B:

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

C:

Procedure output parameters convey scalar results in addition to result sets and return status values.

Question 30

A multitenant application uses one table for several customers and users must see only their tenant rows

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

  1. Two test identities see only their own tenant rows, including queries that omit client-side tenant filters
  2. A test support role sees masked data while an appropriate unmasked role sees the original value
  3. An authorized client decrypts selected columns while the database engine account cannot read the plaintext
  4. Test GRANT and denied SELECT events appear with identity, time and action at the audit destination

Explanation

Correct Answer

A:

RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.

Incorrect Answers

B:

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

C:

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

D:

Auditing generates event evidence of SQL activity but must be configured for relevant actions and protected storage.

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

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