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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 41

Question 400

An app has unstable query latency because the optimizer picks one bad plan for common customer IDs. What should a technical reviewer verify before approving completion?

  1. Load tests show reduced latch waits and consistent insert correctness.
  2. Representative parameter values meet latency targets without breaking atypical cases.
  3. Repeated paging covers the intended rows in deterministic order under the documented consistency model.
  4. Replaying the same event leaves one effective downstream change without data loss.

Explanation

Correct Answer

B:

Query Store keeps plan/runtime history and can help isolate parameter-sensitive plan regressions. The observation “Representative parameter values meet latency targets without breaking atypical cases” directly confirms the chosen action worked for this situation: An app has unstable query latency because the optimizer picks one bad plan for common customer IDs.

Incorrect Answers

A:

Page-level hot spots can constrain concurrency beyond disk capacity; fixes require evidence of actual latch waits. This observation would not establish that the required result occurred for An app has unstable query latency because the optimizer picks one bad plan for common customer IDs. The confirming test is: Representative parameter values meet latency targets without breaking atypical cases.

C:

Stable ordering is essential for pagination; OFFSET without a unique key can duplicate or omit records. This observation would not establish that the required result occurred for An app has unstable query latency because the optimizer picks one bad plan for common customer IDs. The confirming test is: Representative parameter values meet latency targets without breaking atypical cases.

D:

Change triggers and at-least-once deliveries demand explicit deduplication and checkpointing. This observation would not establish that the required result occurred for An app has unstable query latency because the optimizer picks one bad plan for common customer IDs. The confirming test is: Representative parameter values meet latency targets without breaking atypical cases.

Question 401

Two transactions update rows in opposite orders and one becomes a deadlock victim. What should the SQL developer implement after verifying the conditions?

  1. Add bounded, classified transient retries with backoff after addressing underlying lock conflicts.
  2. Choose a supported isolation approach such as read committed snapshot after testing consistency requirements.
  3. Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.
  4. Grant least-privilege SELECT on the approved object and remove broad roles.

Explanation

Correct Answer

C:

Deadlocks form cycles of lock dependencies; a victim rollback must be handled and root lock patterns improved. For the described situation—Two transactions update rows in opposite orders and one becomes a deadlock victim—the targeted fix is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims. A successful test should show: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

Incorrect Answers

A:

Retry logic must be finite and targeted; uncontrolled retries worsen resource contention. But that technique does not solve the stated problem—Two transactions update rows in opposite orders and one becomes a deadlock victim. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

B:

READ UNCOMMITTED or NOLOCK may read uncommitted changes; row versioning can improve concurrency without dirty reads. But that technique does not solve the stated problem—Two transactions update rows in opposite orders and one becomes a deadlock victim. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

D:

Object-level GRANT/DENY provides granular access without conferring database-wide administration. But that technique does not solve the stated problem—Two transactions update rows in opposite orders and one becomes a deadlock victim. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

Question 402

Two transactions update rows in opposite orders and one becomes a deadlock victim. Which verification finding is most specific to this scenario?

  1. Concurrency tests complete with controlled retries and no unhandled deadlock failures.
  2. A query plan uses the intended index range seek and returns identical date-filtered rows.
  3. A controlled test triggers the intended alert with enough context for response.
  4. A test status update starts the intended workflow exactly as designed and records failures.

Explanation

Correct Answer

A:

Deadlocks form cycles of lock dependencies; a victim rollback must be handled and root lock patterns improved. The observation “Concurrency tests complete with controlled retries and no unhandled deadlock failures” directly confirms the chosen action worked for this situation: Two transactions update rows in opposite orders and one becomes a deadlock victim.

Incorrect Answers

B:

Applying functions to indexed columns often prevents efficient predicate seek pushdown. This observation would not establish that the required result occurred for Two transactions update rows in opposite orders and one becomes a deadlock victim. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

C:

Monitoring becomes operationally useful when routed to timely alerts rather than passive dashboards. This observation would not establish that the required result occurred for Two transactions update rows in opposite orders and one becomes a deadlock victim. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

D:

Logic Apps orchestrate external actions; the SQL change signal and connector privileges must be governed. This observation would not establish that the required result occurred for Two transactions update rows in opposite orders and one becomes a deadlock victim. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

Question 403

An order process reports SQL deadlock error 1205 during competing updates. Which approach achieves the intended result without bypassing the stated controls?

  1. Inspect actual execution plans and relevant Query Store runtime statistics before changing indexes.
  2. Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.
  3. Rewrite predicates to sargable range conditions where semantics are preserved.
  4. Publish the signed/identified DACPAC from the validated build through controlled deployment stages.

Explanation

Correct Answer

B:

Deadlocks form cycles of lock dependencies; a victim rollback must be handled and root lock patterns improved. For the described situation—An order process reports SQL deadlock error 1205 during competing updates—the targeted fix is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims. A successful test should show: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

Incorrect Answers

A:

Execution plans show access paths and join strategies; blind indexing is not reliable diagnosis. But that technique does not solve the stated problem—An order process reports SQL deadlock error 1205 during competing updates. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

C:

Applying functions to indexed columns often prevents efficient predicate seek pushdown. But that technique does not solve the stated problem—An order process reports SQL deadlock error 1205 during competing updates. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

D:

Promoting the same validated artifact strengthens release traceability and reduces environment divergence. But that technique does not solve the stated problem—An order process reports SQL deadlock error 1205 during competing updates. The needed intervention is Identify the cycle and standardize access order, shorten transactions, and add bounded retry on deadlock victims.

Question 404

An order process reports SQL deadlock error 1205 during competing updates. How should the team validate the selected design?

  1. Logical reads and transferred bytes decrease while requested data stays correct.
  2. Peak load tests meet resource, latency, and cost limits after the chosen adjustment.
  3. Repository scans find no secret and deployment uses an authorized scoped identity.
  4. Concurrency tests complete with controlled retries and no unhandled deadlock failures.

Explanation

Correct Answer

D:

Deadlocks form cycles of lock dependencies; a victim rollback must be handled and root lock patterns improved. The observation “Concurrency tests complete with controlled retries and no unhandled deadlock failures” directly confirms the chosen action worked for this situation: An order process reports SQL deadlock error 1205 during competing updates.

Incorrect Answers

A:

Overfetching wastes IO and network capacity; targeted projection can allow lean index access. This observation would not establish that the required result occurred for An order process reports SQL deadlock error 1205 during competing updates. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

B:

Capacity selection should reflect measured demand, not only the number of users. This observation would not establish that the required result occurred for An order process reports SQL deadlock error 1205 during competing updates. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

C:

Source control is not a secure secret store; leaked SQL credentials require revocation and rotation. This observation would not establish that the required result occurred for An order process reports SQL deadlock error 1205 during competing updates. The confirming test is: Concurrency tests complete with controlled retries and no unhandled deadlock failures.

Question 405

A batch import holds locks for minutes and blocks customer reads. What intervention should the responsible engineer choose?

  1. Inspect spills/memory grants and adjust query/indexing or capacity based on measured plans.
  2. Add bounded, classified transient retries with backoff after addressing underlying lock conflicts.
  3. Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.
  4. Use a SQL Database Project containing declarative schema objects and run a project build.

Explanation

Correct Answer

C:

Long transactions prolong lock retention, and extra indexes alone cannot resolve idle open transactions. For the described situation—A batch import holds locks for minutes and blocks customer reads—the targeted fix is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions. A successful test should show: Blocked request durations fall while consistency requirements still hold.

Incorrect Answers

A:

Tempdb spills indicate memory/workload mismatch and should be diagnosed from actual plans. But that technique does not solve the stated problem—A batch import holds locks for minutes and blocks customer reads. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

B:

Retry logic must be finite and targeted; uncontrolled retries worsen resource contention. But that technique does not solve the stated problem—A batch import holds locks for minutes and blocks customer reads. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

D:

SQL Database Projects model schema as source files and validate object dependencies during build. But that technique does not solve the stated problem—A batch import holds locks for minutes and blocks customer reads. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

Question 406

A batch import holds locks for minutes and blocks customer reads. What observable outcome proves the recommendation worked?

  1. Representative parameter values meet latency targets without breaking atypical cases.
  2. Estimated and actual row counts become more consistent and query latency improves.
  3. The final merge builds one consistent schema and integration tests pass.
  4. Blocked request durations fall while consistency requirements still hold.

Explanation

Correct Answer

D:

Long transactions prolong lock retention, and extra indexes alone cannot resolve idle open transactions. The observation “Blocked request durations fall while consistency requirements still hold” directly confirms the chosen action worked for this situation: A batch import holds locks for minutes and blocks customer reads.

Incorrect Answers

A:

Query Store keeps plan/runtime history and can help isolate parameter-sensitive plan regressions. This observation would not establish that the required result occurred for A batch import holds locks for minutes and blocks customer reads. The confirming test is: Blocked request durations fall while consistency requirements still hold.

B:

Statistics guide cardinality estimation; stale distributions can cause inefficient joins and memory grants. This observation would not establish that the required result occurred for A batch import holds locks for minutes and blocks customer reads. The confirming test is: Blocked request durations fall while consistency requirements still hold.

C:

Schema object changes can conflict logically even if text merge succeeds; project validation catches inconsistencies. This observation would not establish that the required result occurred for A batch import holds locks for minutes and blocks customer reads. The confirming test is: Blocked request durations fall while consistency requirements still hold.

Question 407

A write transaction leaves connections open while performing slow external network operations. Which design choice BEST addresses the root issue?

  1. Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.
  2. Implement optimistic concurrency using a rowversion or equivalent checked update token.
  3. Add a unique stable tie-breaker to ordering and consider keyset pagination for mutable streams.
  4. Grant least-privilege SELECT on the approved object and remove broad roles.

Explanation

Correct Answer

A:

Long transactions prolong lock retention, and extra indexes alone cannot resolve idle open transactions. For the described situation—A write transaction leaves connections open while performing slow external network operations—the targeted fix is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions. A successful test should show: Blocked request durations fall while consistency requirements still hold.

Incorrect Answers

B:

Optimistic concurrency compares version tokens to prevent lost updates without holding long locks. But that technique does not solve the stated problem—A write transaction leaves connections open while performing slow external network operations. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

C:

Stable ordering is essential for pagination; OFFSET without a unique key can duplicate or omit records. But that technique does not solve the stated problem—A write transaction leaves connections open while performing slow external network operations. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

D:

Object-level GRANT/DENY provides granular access without conferring database-wide administration. But that technique does not solve the stated problem—A write transaction leaves connections open while performing slow external network operations. The needed intervention is Reduce transaction scope, choose suitable indexes/isolation, and keep external calls outside transactions.

Question 408

A write transaction leaves connections open while performing slow external network operations. Which result would provide the strongest acceptance evidence?

  1. Logical reads and transferred bytes decrease while requested data stays correct.
  2. Blocked request durations fall while consistency requirements still hold.
  3. Concurrent reports avoid dirty data while meeting tested read/write throughput goals.
  4. Deployment logs show expected object changes and no unauthorized operations.

Explanation

Correct Answer

B:

Long transactions prolong lock retention, and extra indexes alone cannot resolve idle open transactions. The observation “Blocked request durations fall while consistency requirements still hold” directly confirms the chosen action worked for this situation: A write transaction leaves connections open while performing slow external network operations.

Incorrect Answers

A:

Overfetching wastes IO and network capacity; targeted projection can allow lean index access. This observation would not establish that the required result occurred for A write transaction leaves connections open while performing slow external network operations. The confirming test is: Blocked request durations fall while consistency requirements still hold.

C:

READ UNCOMMITTED or NOLOCK may read uncommitted changes; row versioning can improve concurrency without dirty reads. This observation would not establish that the required result occurred for A write transaction leaves connections open while performing slow external network operations. The confirming test is: Blocked request durations fall while consistency requirements still hold.

D:

DACPAC deployment synchronizes model schema under controlled configuration, not arbitrary unreviewed scripts. This observation would not establish that the required result occurred for A write transaction leaves connections open while performing slow external network operations. The confirming test is: Blocked request durations fall while consistency requirements still hold.

Question 409

A reporting query reads the same row while a writer changes it and inconsistent balances appear. What should the database team change FIRST for this workload?

  1. Inspect execution-plan estimates and update relevant statistics before proposing disruptive hints.
  2. Choose a supported isolation approach such as read committed snapshot after testing consistency requirements.
  3. Configure Azure Monitor metrics, diagnostic logs, and appropriate alerts with actionable thresholds.
  4. Grant least-privilege SELECT on the approved object and remove broad roles.

Explanation

Correct Answer

B:

READ UNCOMMITTED or NOLOCK may read uncommitted changes; row versioning can improve concurrency without dirty reads. For the described situation—A reporting query reads the same row while a writer changes it and inconsistent balances appear—the targeted fix is Choose a supported isolation approach such as read committed snapshot after testing consistency requirements. A successful test should show: Concurrent reports avoid dirty data while meeting tested read/write throughput goals.

Incorrect Answers

A:

Statistics guide cardinality estimation; stale distributions can cause inefficient joins and memory grants. But that technique does not solve the stated problem—A reporting query reads the same row while a writer changes it and inconsistent balances appear. The needed intervention is Choose a supported isolation approach such as read committed snapshot after testing consistency requirements.

C:

Monitoring becomes operationally useful when routed to timely alerts rather than passive dashboards. But that technique does not solve the stated problem—A reporting query reads the same row while a writer changes it and inconsistent balances appear. The needed intervention is Choose a supported isolation approach such as read committed snapshot after testing consistency requirements.

D:

Object-level GRANT/DENY provides granular access without conferring database-wide administration. But that technique does not solve the stated problem—A reporting query reads the same row while a writer changes it and inconsistent balances appear. The needed intervention is Choose a supported isolation approach such as read committed snapshot after testing consistency requirements.

Question 410

A reporting query reads the same row while a writer changes it and inconsistent balances appear. Which acceptance check should accompany the remediation?

  1. A stale write is detected and retried or rejected rather than silently overwriting new data.
  2. Concurrent reports avoid dirty data while meeting tested read/write throughput goals.
  3. Blocked request durations fall while consistency requirements still hold.
  4. A test status update starts the intended workflow exactly as designed and records failures.

Explanation

Correct Answer

B:

READ UNCOMMITTED or NOLOCK may read uncommitted changes; row versioning can improve concurrency without dirty reads. The observation “Concurrent reports avoid dirty data while meeting tested read/write throughput goals” directly confirms the chosen action worked for this situation: A reporting query reads the same row while a writer changes it and inconsistent balances appear.

Incorrect Answers

A:

Optimistic concurrency compares version tokens to prevent lost updates without holding long locks. This observation would not establish that the required result occurred for A reporting query reads the same row while a writer changes it and inconsistent balances appear. The confirming test is: Concurrent reports avoid dirty data while meeting tested read/write throughput goals.

C:

Long transactions prolong lock retention, and extra indexes alone cannot resolve idle open transactions. This observation would not establish that the required result occurred for A reporting query reads the same row while a writer changes it and inconsistent balances appear. The confirming test is: Concurrent reports avoid dirty data while meeting tested read/write throughput goals.

D:

Logic Apps orchestrate external actions; the SQL change signal and connector privileges must be governed. This observation would not establish that the required result occurred for A reporting query reads the same row while a writer changes it and inconsistent balances appear. The confirming test is: Concurrent reports avoid dirty data while meeting tested read/write throughput goals.

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