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Developing AI-Enabled Database Solutions DP-800 Practice Test 36

Question 350

A BI workload needs a narrow read surface without direct SELECT on base tables

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

  1. Unit tests compare scalar outputs to known boundary values and query plans avoid unacceptable per-row cost
  2. JOINing the function to a caller produces the expected rows with a stable execution plan
  3. Successful calls update all required tables and forced errors leave no partial transaction
  4. A test principal can query approved columns through the view but cannot query the base table directly

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.

C:

Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.

Question 351

An investigation maps customer devices, account nodes and transfer edges to find two-hop relationships

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

  1. Use SQL graph MATCH patterns over the relevant node and edge tables
  2. Use a recursive CTE with anchor member, recursive member, and safe termination
  3. Define a window aggregate with an explicit ROWS frame and ordered partition
  4. Use THROW to propagate the original or meaningful custom exception after cleanup

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

A ROWS frame specifies exactly which neighboring rows contribute, whereas default RANGE behavior may include peer rows.

D:

THROW provides structured error propagation that callers can handle and prevents false-success status reporting.

Question 352

An AI data pipeline must replay each insert and update with historical values

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

  1. A test update invokes one logical embedding refresh even when the event is delivered twice
  2. A sequence of updates yields the required event details and can be replayed from a checkpoint
  3. A no-change test batch makes no model calls and changed rows are refreshed correctly
  4. Representative model outputs insert successfully and validation rejects mismatched vector lengths

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.

D:

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

Question 353

An organization chart must report every subordinate level beneath one manager

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

  1. An account with three matching child rows appears once while accounts without matches are excluded
  2. Seeded three-level reporting lines are returned in the correct hierarchy without infinite recursion
  3. The requested multi-hop path appears and a disconnected seeded node is excluded
  4. The caller receives the expected SQL error and the deployment marks the operation failed

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Correlated EXISTS performs an existence test and avoids multiplying outer rows for multiple qualifying matches.

C:

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

D:

THROW provides structured error propagation that callers can handle and prevents false-success status reporting.

Question 354

A code assistant offers multiple model choices with different output and data-handling policies

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

  1. A review confirms prompts include only approved schema/sample context and no real personal data
  2. The session displays the approved model and request logs show no traffic to disallowed providers
  3. Generated sample changes follow approved conventions and code owners verify deviations explicitly
  4. Compiled and reviewed SQL references only existing approved columns and tables

Explanation

Correct Answer

B:

Model choice affects capability and governance, and prompts must stay within the approved service boundary.

Incorrect Answers

A:

AI-assisted code generation does not waive data classification, retention and exposure restrictions.

C:

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

D:

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

Question 355

A team manages schema changes as loose SQL scripts and versions drift between developers

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

  1. Configure appropriate SQL project references and validate external dependencies
  2. Require a defined suite of SQL lint/build/test and review checks on schema pull requests
  3. Introduce a tested predeployment data remediation with explicit rollback criteria
  4. Define the database schema in a SQL Database Project under source control

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

B:

A successful compiler build is necessary but not sufficient for quality or secure schema changes.

C:

Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.

Question 356

A new customer signup requires a default creation timestamp when the client omits one

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

  1. Create a UNIQUE constraint or index on the relevant business key with documented NULL rules
  2. Apply NOT NULL to mandatory attributes and handle optional fields explicitly
  3. Define a DEFAULT constraint for the column with an appropriate expression
  4. Use a SEQUENCE and request values explicitly where shared preallocation is required

Explanation

Correct Answer

C:

A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.

Incorrect Answers

A:

Uniqueness for non-primary business attributes is enforced separately from the surrogate primary key.

B:

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

D:

Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.

Question 357

A query shows the correct SQL logic but its Sort has severe memory spill warnings

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

  1. Evaluate READ_COMMITTED_SNAPSHOT where supported and correct for the workload
  2. Validate service-tier configuration against representative peak performance and capacity requirements
  3. Use appropriate dynamic management views to identify waits, blockers and resource pressure
  4. Capture and inspect the actual execution plan including row counts, join operators and warnings

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Versioned read-committed isolation reduces reader/writer blocking but changes consistency semantics and tempdb/version-store demand.

B:

Saving compute cost is not safe if CPU, IO or memory limits violate service-level objectives.

C:

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

Question 358

A transactional table has frequent point lookups and no current clustered index

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

  1. Evaluate a memory-optimized table with the correct durability and index choices
  2. Define a DEFAULT constraint for the column with an appropriate expression
  3. Choose a clustered index key appropriate to the prevalent access pattern and insert behavior
  4. Use a filtered index whose predicate matches the stable selective subset being queried

Explanation

Correct Answer

C:

The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.

Incorrect Answers

A:

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

B:

A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.

D:

A predicate-limited index has fewer rows to maintain and can serve a matching selective WHERE clause.

Question 359

A SQL application calls an external model through a stored procedure but the endpoint rejects long or invalid payloads

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. Construct and invoke sp_invoke_external_rest_endpoint with approved request metadata and bounded payload
  3. Decouple high-latency model calls from critical SQL write transactions where possible
  4. Include stable source identifiers and timestamps with grounded context and render traceable citations

Explanation

Correct Answer

B:

The stored procedure can call an external REST endpoint under its security/configuration limits; the caller must handle HTTP errors and quotas.

Incorrect Answers

A:

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

C:

External network latency inside a transaction prolongs locks and increases deadlock and timeout exposure.

D:

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

Question 360

Events arrive from branches in different time zones and audits need original offsets

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

  1. The same event displays a consistent instant after conversion between several regional offsets
  2. The actual plan seeks using the indexed JSON property while returning the same matching document IDs
  3. Boundary-value test rows land in the intended partition before the annual rollover job is approved
  4. Concurrent inserts receive distinct generated keys and the application tolerates missing numeric positions

Explanation

Correct Answer

A:

Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.

Incorrect Answers

B:

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

C:

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

D:

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

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

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