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Developing AI-Enabled Database Solutions DP-800 Practice Test 92

Question 910

A DAB GraphQL consumer needs to constrain query results to authorized fields and predicates

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

  1. Evaluate Change Event Streaming (CES) where the chosen SQL platform supports it
  2. Use change data capture when row-level historical change details are required and supported
  3. Declare Data API Builder GraphQL relationships with correct cardinality and column mapping
  4. Expose controlled filtering parameters and enforce SQL/role boundaries

Explanation

Correct Answer

D:

API filtering reduces unnecessary result transfer but cannot replace server-side authorization.

Incorrect Answers

A:

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

B:

CDC records changes from the transaction log for downstream consumption, but latency and retention need management.

C:

GraphQL relationships make defined SQL relations traversable through the API without arbitrary client SQL.

Question 911

A large historical transaction store supports mostly batch reporting rather than single-row updates

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

  1. Build a selective nonclustered index with appropriate key and INCLUDE columns for the critical query
  2. Rewrite the predicate into a sargable range on the original indexed column
  3. Align the required indexes and partition schemes before partition-switch operations
  4. Use an appropriate clustered columnstore design for scan-heavy analytics

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Covering indexes can avoid residual lookups while keeping included attributes out of the search-key ordering.

B:

Avoiding functions on the indexed search column can let the optimizer use an index seek.

C:

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

Question 912

A frontend wants to traverse an approved parent-child relationship using a typed GraphQL field

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

  1. Enable Azure Monitor Application Insights telemetry with correlation identifiers for the request path
  2. Declare Data API Builder GraphQL relationships with correct cardinality and column mapping
  3. Configure API caching with suitable invalidation or TTL for read-safe entities
  4. Deploy DAB with environment-specific configuration and managed secret or identity settings

Explanation

Correct Answer

B:

GraphQL relationships make defined SQL relations traversable through the API without arbitrary client SQL.

Incorrect Answers

A:

Distributed trace correlation helps associate API failures, dependency latency and service operations.

C:

Caching reduces repeat database load but introduces staleness and must avoid exposing user-specific sensitive results.

D:

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

Question 913

An application needs a stable SELECT interface without exposing underlying table complexity

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. Create a view encapsulating the reusable SELECT and grant access to the view as appropriate
  3. Review ownership chaining and module permissions before exposing a privileged stored procedure
  4. Expose a least-privilege view and grant it instead of broadly granting underlying tables

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

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

Question 914

A report needs a transaction-wide stable snapshot despite concurrent writes

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

  1. The identified bottleneck reproduces the timeout and a targeted fix removes it without unrelated changes
  2. Repeated reads within the snapshot remain consistent and conflicting updates are handled explicitly
  3. Separate small- and large-tenant workloads both meet latency targets without causing global regressions
  4. Samples identify a repeatable dominant wait category linked to the tested slowdown

Explanation

Correct Answer

B:

Snapshot transactions read a consistent row version as of transaction start without dirty reads, but writes may conflict.

Incorrect Answers

A:

Latency symptoms may come from blocking, execution plans, throttling or network; one symptom cannot establish root cause.

C:

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

D:

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

Question 915

A document retrieval index has confidential columns that ordinary search users must not access

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

  1. Use full-text or exact lexical search appropriate for exact tokens and terms
  2. Restrict indexed/searchable columns and enforce permissions independently of relevance
  3. Use semantic vector retrieval with a relevant embedding model
  4. Introduce tested diversity or deduplication rules after tenant-filtered candidate retrieval

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

Vector similarity can match related meaning beyond exact token overlap if embedding quality is adequate.

D:

Near-duplicate chunks can crowd top-K slots and lower answer coverage even with accurate vector ranking.

Question 916

Customer names include accents and scripts from several countries in a shared table

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

  1. Implement a CHECK constraint expressing the permitted numeric or state values
  2. Evaluate a memory-optimized table with the correct durability and index choices
  3. Choose Unicode-compatible character storage such as NVARCHAR for the required text
  4. Configure an IDENTITY column with suitable seed and increment while treating values as identifiers, not gapless sequence numbers

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

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

Question 917

An API frequently filters a JSON payload by a customer tier nested inside a document

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

  1. The actual plan seeks using the indexed JSON property while returning the same matching document IDs
  2. Boundary-value test rows land in the intended partition before the annual rollover job is approved
  3. An approved multi-hop pattern query finds the seeded relationships and rejects absent edges
  4. An as-of query returns the prior value after a controlled update while current queries return the new value

Explanation

Correct Answer

A:

An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.

Incorrect Answers

B:

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

C:

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

D:

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

Question 918

An ETL bulk insert creates one audit record when it should record every inserted row

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

  1. A test principal can query approved columns through the view but cannot query the base table directly
  2. Unit tests compare scalar outputs to known boundary values and query plans avoid unacceptable per-row cost
  3. A 200-row test produces 200 correct audit details with no duplicate or missing records
  4. The client receives the intended result only and the procedure still records actual affected-row counts internally

Explanation

Correct Answer

C:

DML triggers run per statement and inserted/deleted can contain multiple rows; singleton assumptions cause data loss.

Incorrect Answers

A:

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

B:

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

D:

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

Question 919

An application publishes Data API Builder GraphQL endpoints to external users with no permission check

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

  1. Enforce authentication, entity permissions and least-privilege database authorization on REST and GraphQL
  2. Route auditing to protected centralized storage with access controls and appropriate retention
  3. Plan Always Encrypted key rotation and re-encryption with a controlled client and validation workflow
  4. Use synthetic or irreversibly de-identified test data with appropriate access and retention

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

Separating audit custody from operational administrators reduces the risk of tampering and premature deletion.

C:

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

D:

Nonproduction environments should not inherit production exposure merely for test convenience.

Question 920

A report needs all tags for each product returned as a JSON array

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

  1. Apply REGEXP_LIKE with a tested, appropriately anchored regular expression
  2. Use JSON_ARRAYAGG with grouping suited to the required output
  3. Use RANK OVER the ranking order rather than ROW_NUMBER or DENSE_RANK
  4. Evaluate JARO_WINKLER_DISTANCE for a name-similarity signal alongside business checks

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

RANK assigns tied rows the same rank and leaves gaps; DENSE_RANK does not leave gaps.

D:

Jaro-Winkler style similarity rewards matching character patterns and helps with transpositions but cannot prove identity.

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

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