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Exam Code: DP-800

Exam Name: Developing AI-Enabled Database Solutions

Certification Provider: Microsoft

Corresponding Certification: Microsoft Certified: SQL AI Developer Associate

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Microsoft DP-800 Practice Test 14

Question 130

An order total is recomputed for every row using a scalar UDF and execution becomes slow. Which verification finding is most specific to this scenario?

  1. Consumers query current source rows through the same named projection.
  2. The batch returns the same totals with lower CPU time on representative volumes.
  3. An insert against the view updates the expected base tables and rejects invalid mappings.
  4. The following SELECT references the CTE and returns the same rows without persistent objects.

Explanation

Correct Answer

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. The observation “The batch returns the same totals with lower CPU time on representative volumes” directly confirms the chosen action worked for this situation: An order total is recomputed for every row using a scalar UDF and execution becomes slow.

Incorrect Answers

A:

A standard view stores query definition rather than a separately refreshed result set. This observation would not establish that the required result occurred for An order total is recomputed for every row using a scalar UDF and execution becomes slow. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

C:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. This observation would not establish that the required result occurred for An order total is recomputed for every row using a scalar UDF and execution becomes slow. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

D:

A CTE is a named subquery scoped to a single following DML statement, not an automatic materialized table. This observation would not establish that the required result occurred for An order total is recomputed for every row using a scalar UDF and execution becomes slow. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

Question 131

A developer can express discount math directly using relational expressions but uses a per-row function call. Which approach achieves the intended result without bypassing the stated controls?

  1. Pass the intended identifiers in a table-valued parameter to a set-based procedure where supported.
  2. Prefer set-based expressions or an appropriate inline TVF after measuring query plans.
  3. Create a least-privilege projection view and grant SELECT on only that interface.
  4. Use REGEXP_SUBSTR with the desired expression and occurrence rules.

Explanation

Correct Answer

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. For the described situation—A developer can express discount math directly using relational expressions but uses a per-row function call—the targeted fix is Prefer set-based expressions or an appropriate inline TVF after measuring query plans. A successful test should show: The batch returns the same totals with lower CPU time on representative volumes.

Incorrect Answers

A:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. But that technique does not solve the stated problem—A developer can express discount math directly using relational expressions but uses a per-row function call. The needed intervention is Prefer set-based expressions or an appropriate inline TVF after measuring query plans.

C:

Views can provide a data-access interface when underlying object permissions are managed appropriately. But that technique does not solve the stated problem—A developer can express discount math directly using relational expressions but uses a per-row function call. The needed intervention is Prefer set-based expressions or an appropriate inline TVF after measuring query plans.

D:

REGEXP_SUBSTR extracts matching text; REGEXP_LIKE only evaluates whether a match exists. But that technique does not solve the stated problem—A developer can express discount math directly using relational expressions but uses a per-row function call. The needed intervention is Prefer set-based expressions or an appropriate inline TVF after measuring query plans.

Question 132

A developer can express discount math directly using relational expressions but uses a per-row function call. How should the team validate the selected design?

  1. The TVF joins efficiently to callers and returns correct results across parameter values.
  2. The batch returns the same totals with lower CPU time on representative volumes.
  3. An insert against the view updates the expected base tables and rejects invalid mappings.
  4. A test transaction and review prevent unexpected row removal in production.

Explanation

Correct Answer

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. The observation “The batch returns the same totals with lower CPU time on representative volumes” directly confirms the chosen action worked for this situation: A developer can express discount math directly using relational expressions but uses a per-row function call.

Incorrect Answers

A:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. This observation would not establish that the required result occurred for A developer can express discount math directly using relational expressions but uses a per-row function call. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

C:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. This observation would not establish that the required result occurred for A developer can express discount math directly using relational expressions but uses a per-row function call. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

D:

Generative suggestions are untrusted code; destructive statements need deterministic safety controls. This observation would not establish that the required result occurred for A developer can express discount math directly using relational expressions but uses a per-row function call. The confirming test is: The batch returns the same totals with lower CPU time on representative volumes.

Question 133

A stored procedure must preserve the original error details when its transaction fails. What intervention should the responsible engineer choose?

  1. Implement TRY...CATCH with rollback and THROW to surface the failure.
  2. Pass the intended identifiers in a table-valued parameter to a set-based procedure where supported.
  3. Implement an appropriate inline table-valued function with parameters.
  4. Build a recursive CTE with anchor and recursive members plus a safe termination strategy.

Explanation

Correct Answer

A:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. For the described situation—A stored procedure must preserve the original error details when its transaction fails—the targeted fix is Implement TRY...CATCH with rollback and THROW to surface the failure. A successful test should show: A forced constraint error rolls back the unit of work and reaches the caller.

Incorrect Answers

B:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. But that technique does not solve the stated problem—A stored procedure must preserve the original error details when its transaction fails. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

C:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. But that technique does not solve the stated problem—A stored procedure must preserve the original error details when its transaction fails. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

D:

Recursive CTEs repeatedly apply the recursive member and require attention to cycles and MAXRECURSION. But that technique does not solve the stated problem—A stored procedure must preserve the original error details when its transaction fails. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

Question 134

A stored procedure must preserve the original error details when its transaction fails. What observable outcome proves the recommendation worked?

  1. The batch returns the same totals with lower CPU time on representative volumes.
  2. One call handles all requested IDs consistently and reduces client/server round trips.
  3. A forced constraint error rolls back the unit of work and reaches the caller.
  4. The endpoint returns valid JSON with escaped strings and expected property names.

Explanation

Correct Answer

C:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. The observation “A forced constraint error rolls back the unit of work and reaches the caller” directly confirms the chosen action worked for this situation: A stored procedure must preserve the original error details when its transaction fails.

Incorrect Answers

A:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. This observation would not establish that the required result occurred for A stored procedure must preserve the original error details when its transaction fails. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

B:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. This observation would not establish that the required result occurred for A stored procedure must preserve the original error details when its transaction fails. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

D:

JSON construction functions handle quoting/escaping rather than brittle string assembly. This observation would not establish that the required result occurred for A stored procedure must preserve the original error details when its transaction fails. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

Question 135

A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. Which design choice BEST addresses the root issue?

  1. Implement TRY...CATCH with rollback and THROW to surface the failure.
  2. Move supported filtering, ordering, and pagination into SQL with stable sort keys.
  3. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.
  4. Use RANK over the score ordering rather than DENSE_RANK.

Explanation

Correct Answer

A:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. For the described situation—A payment write catches SQL exceptions and returns success even though an INSERT was rolled back—the targeted fix is Implement TRY...CATCH with rollback and THROW to surface the failure. A successful test should show: A forced constraint error rolls back the unit of work and reaches the caller.

Incorrect Answers

B:

Set-based filtering and stable paging reduce unnecessary data movement; paging without deterministic order can skip or repeat rows. But that technique does not solve the stated problem—A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

C:

Stored procedures support parameterized transactional operations and shared business enforcement. But that technique does not solve the stated problem—A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

D:

RANK leaves gaps after ties while DENSE_RANK does not. But that technique does not solve the stated problem—A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The needed intervention is Implement TRY...CATCH with rollback and THROW to surface the failure.

Question 136

A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. Which result would provide the strongest acceptance evidence?

  1. Concurrent calls each receive the identifier from their own insert.
  2. A forced constraint error rolls back the unit of work and reaches the caller.
  3. Each request returns the intended page consistently and database/network load decreases.
  4. Only customers meeting the aggregate threshold appear at the requested group granularity.

Explanation

Correct Answer

B:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. The observation “A forced constraint error rolls back the unit of work and reaches the caller” directly confirms the chosen action worked for this situation: A payment write catches SQL exceptions and returns success even though an INSERT was rolled back.

Incorrect Answers

A:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. This observation would not establish that the required result occurred for A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

C:

Set-based filtering and stable paging reduce unnecessary data movement; paging without deterministic order can skip or repeat rows. This observation would not establish that the required result occurred for A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

D:

HAVING filters groups after aggregation; WHERE filters source rows before aggregation. This observation would not establish that the required result occurred for A payment write catches SQL exceptions and returns success even though an INSERT was rolled back. The confirming test is: A forced constraint error rolls back the unit of work and reaches the caller.

Question 137

A procedure logs each order twice when a trigger accidentally updates the same table recursively. What should the database team change FIRST for this workload?

  1. Prefer set-based expressions or an appropriate inline TVF after measuring query plans.
  2. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.
  3. Configure repository-level Copilot instruction files specifying SQL conventions and approved practices.
  4. Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

Explanation

Correct Answer

D:

Trigger recursion and row-at-a-time assumptions can create performance and correctness failures. For the described situation—A procedure logs each order twice when a trigger accidentally updates the same table recursively—the targeted fix is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior. A successful test should show: A batch update changes each intended row once and emits exactly the expected audit effects.

Incorrect Answers

A:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. But that technique does not solve the stated problem—A procedure logs each order twice when a trigger accidentally updates the same table recursively. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

B:

Stored procedures support parameterized transactional operations and shared business enforcement. But that technique does not solve the stated problem—A procedure logs each order twice when a trigger accidentally updates the same table recursively. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

C:

Copilot instruction files guide generated suggestions but do not enforce database permissions or accuracy. But that technique does not solve the stated problem—A procedure logs each order twice when a trigger accidentally updates the same table recursively. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

Question 138

A procedure logs each order twice when a trigger accidentally updates the same table recursively. Which acceptance check should accompany the remediation?

  1. The batch returns the same totals with lower CPU time on representative volumes.
  2. An attempted update of approved records is rejected with a clear error while draft edits remain possible.
  3. Queries access the intended authorized remote data without materializing an unrelated local copy.
  4. A batch update changes each intended row once and emits exactly the expected audit effects.

Explanation

Correct Answer

D:

Trigger recursion and row-at-a-time assumptions can create performance and correctness failures. The observation “A batch update changes each intended row once and emits exactly the expected audit effects” directly confirms the chosen action worked for this situation: A procedure logs each order twice when a trigger accidentally updates the same table recursively.

Incorrect Answers

A:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. This observation would not establish that the required result occurred for A procedure logs each order twice when a trigger accidentally updates the same table recursively. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

B:

State-dependent protections need carefully tested enforcement; triggers must handle statement sets and errors. This observation would not establish that the required result occurred for A procedure logs each order twice when a trigger accidentally updates the same table recursively. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

C:

External tables expose remote records through SQL abstraction subject to connector and authentication support. This observation would not establish that the required result occurred for A procedure logs each order twice when a trigger accidentally updates the same table recursively. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

Question 139

A bulk status update activates an auditing trigger that performs unintended self-updates. Which implementation most directly satisfies the stated requirement?

  1. Use an INSTEAD OF trigger where supported to implement the intended view-write translation.
  2. Prefer set-based expressions or an appropriate inline TVF after measuring query plans.
  3. Use the supported native JSON type and JSON index after validating target SQL version and predicates.
  4. Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

Explanation

Correct Answer

D:

Trigger recursion and row-at-a-time assumptions can create performance and correctness failures. For the described situation—A bulk status update activates an auditing trigger that performs unintended self-updates—the targeted fix is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior. A successful test should show: A batch update changes each intended row once and emits exactly the expected audit effects.

Incorrect Answers

A:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. But that technique does not solve the stated problem—A bulk status update activates an auditing trigger that performs unintended self-updates. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. But that technique does not solve the stated problem—A bulk status update activates an auditing trigger that performs unintended self-updates. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

C:

Modern SQL JSON indexes can accelerate supported path predicates; older SQL versions require alternative indexing strategies. But that technique does not solve the stated problem—A bulk status update activates an auditing trigger that performs unintended self-updates. The needed intervention is Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.

Question 140

A bulk status update activates an auditing trigger that performs unintended self-updates. What measurement or test best demonstrates that the requirement is satisfied?

  1. A batch update changes each intended row once and emits exactly the expected audit effects.
  2. One call handles all requested IDs consistently and reduces client/server round trips.
  3. A forced constraint error rolls back the unit of work and reaches the caller.
  4. True matches are found in the intended array or object path while nonmatches are excluded.

Explanation

Correct Answer

A:

Trigger recursion and row-at-a-time assumptions can create performance and correctness failures. The observation “A batch update changes each intended row once and emits exactly the expected audit effects” directly confirms the chosen action worked for this situation: A bulk status update activates an auditing trigger that performs unintended self-updates.

Incorrect Answers

B:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. This observation would not establish that the required result occurred for A bulk status update activates an auditing trigger that performs unintended self-updates. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

C:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. This observation would not establish that the required result occurred for A bulk status update activates an auditing trigger that performs unintended self-updates. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

D:

JSON membership functions compare structured content, not formatting-dependent text substrings. This observation would not establish that the required result occurred for A bulk status update activates an auditing trigger that performs unintended self-updates. The confirming test is: A batch update changes each intended row once and emits exactly the expected audit effects.

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