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DP-800 Questions & Answers
Exam Code: DP-800
Exam Name: Developing AI-Enabled Database Solutions
Certification Provider: Microsoft
DP-800 Premium File
101 Questions & Answers
Last Update: Nov 12, 2026
Includes questions types found on actual exam such as drag and drop, simulation, type in, and fill in the blank.
Verified by experts
DP-800 Questions & Answers
Exam Code: DP-800
Exam Name: Developing AI-Enabled Database Solutions
Certification Provider: Microsoft
DP-800 Premium File
101 Questions & Answers
Last Update: Nov 12, 2026
Includes questions types found on actual exam such as drag and drop, simulation, type in, and fill in the blank.
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Developing AI-Enabled Database Solutions DP-800 Practice Test 42

Question 410

The design document proposes the following implementation: Add a UNIQUE constraint or suitable unique index on the external invoice number. Given that a billing app must ensure no two invoices share the same external invoice number across concurrent writers. Which technical principle most directly explains why it works?

  1. Pruning avoids unrelated partitions when predicates align with partition boundaries
  2. Uniqueness is enforced by the engine for all database clients, including concurrent sessions
  3. Ledger records support tamper-evidence through transaction history and cryptographic verification
  4. Aligned partitioning permits supported partition-level data movement and pruning

Explanation

Correct Answer

B:

Uniqueness is enforced by the engine for all database clients, including concurrent sessions. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: a second insert using an existing invoice number is rejected.

Incorrect Answers

A:

Pruning avoids unrelated partitions when predicates align with partition boundaries. That principle is applicable when a large log table is partitioned by ingestion month, but queries to one month still scan all partitions. It does not explain the selected change in the current case, which depends on uniqueness is enforced by the engine for all database clients, including concurrent sessions.

C:

Ledger records support tamper-evidence through transaction history and cryptographic verification. That principle is applicable when a SQL Server compliance ledger must provide tamper-evidence for historical financial entries without trusting application logs alone. It does not explain the selected change in the current case, which depends on uniqueness is enforced by the engine for all database clients, including concurrent sessions.

D:

Aligned partitioning permits supported partition-level data movement and pruning. That principle is applicable when a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival. It does not explain the selected change in the current case, which depends on uniqueness is enforced by the engine for all database clients, including concurrent sessions.

Question 411

A release reviewer must verify the effect of this implementation: Add a UNIQUE constraint or suitable unique index on the external invoice number. The check must catch this potential failure: Checking uniqueness in the web app before INSERT leaves a race window. Which observed outcome demonstrates the desired behavior?

  1. A historical query returns the old value while a current query returns the new value
  2. Valid nested region values appear and missing paths receive the expected null handling
  3. A second INSERT using an existing invoice number is rejected
  4. Concurrent inserts receive distinct allocated sequence numbers under normal use

Explanation

Correct Answer

C:

A second INSERT using an existing invoice number is rejected. This is the direct acceptance criterion because uniqueness is enforced by the engine for all database clients, including concurrent sessions. The validation should also distinguish the failure condition: checking uniqueness in the web app before INSERT leaves a race window.

Incorrect Answers

A:

A historical query returns the old value while a current query returns the new value. That observation would validate a different requirement: a SQL Server help desk must query an account's value as it existed at a previous point in time after legitimate updates. Here the required evidence is a second INSERT using an existing invoice number is rejected.

B:

Valid nested region values appear and missing paths receive the expected null handling. That observation would validate a different requirement: an application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document. Here the required evidence is a second INSERT using an existing invoice number is rejected.

D:

Concurrent inserts receive distinct allocated sequence numbers under normal use. That observation would validate a different requirement: a ticketing service needs unique monotonic numeric identifiers across multiple inserting sessions without using a table-wide MAX-plus-one lookup. Here the required evidence is a second INSERT using an existing invoice number is rejected.

Question 412

A regression is reported after deployment: Checking uniqueness in the web app before INSERT leaves a race window. The actual requirement is: A billing app must ensure no two invoices share the same external invoice number across concurrent writers. Which corrective implementation addresses the cause?

  1. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs
  2. Create a measured composite index with TenantId as a selective leading key and OrderDate suitable for range seeks
  3. Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path
  4. Add a UNIQUE constraint or suitable unique index on the external invoice number

Explanation

Correct Answer

D:

Add a UNIQUE constraint or suitable unique index on the external invoice number. Uniqueness is enforced by the engine for all database clients, including concurrent sessions. This directly corrects the observed failure, and success can be checked because a second INSERT using an existing invoice number is rejected.

Incorrect Answers

A:

Columnstore compresses columns and can accelerate scans and batch aggregation for suitable analytic workloads. Although relevant to a SQL Server analytics workload aggregates hundreds of millions of mostly read-only event rows, and a rowstore scan is expensive, this action would not correct the recorded production failure: checking uniqueness in the web app before INSERT leaves a race window. Use the target remedy instead.

B:

A seekable leading equality predicate followed by a range predicate can reduce the rows examined. Although relevant to an Azure SQL reporting table has 40 million sales rows; queries filter by TenantId and recent OrderDate but repeatedly scan the heap, this action would not correct the recorded production failure: checking uniqueness in the web app before INSERT leaves a race window. Use the target remedy instead.

C:

Indexable computed expressions can expose selective expression predicates to the optimizer. Although relevant to a SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression, this action would not correct the recorded production failure: checking uniqueness in the web app before INSERT leaves a race window. Use the target remedy instead.

Question 413

Before approving the database change, the architect reviews this case: A large log table is partitioned by ingestion month, but queries to one month still scan all partitions. Which implementation best satisfies this requirement?

  1. Use range predicates on the actual partitioning key and verify partition elimination in the plan
  2. Create a measured composite index with TenantId as a selective leading key and OrderDate suitable for range seeks
  3. Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path
  4. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs

Explanation

Correct Answer

A:

Pruning avoids unrelated partitions when predicates align with partition boundaries. For this stated production need, the recommended implementation is: Use range predicates on the actual partitioning key and verify partition elimination in the plan. Evidence to look for: the plan accesses only partitions covering the requested month.

Incorrect Answers

B:

A seekable leading equality predicate followed by a range predicate can reduce the rows examined. That method solves a different requirement: an Azure SQL reporting table has 40 million sales rows; queries filter by TenantId and recent OrderDate but repeatedly scan the heap. The current case instead requires use range predicates on the actual partitioning key and verify partition elimination in the plan.

C:

Indexable computed expressions can expose selective expression predicates to the optimizer. That method solves a different requirement: a SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression. The current case instead requires use range predicates on the actual partitioning key and verify partition elimination in the plan.

D:

Columnstore compresses columns and can accelerate scans and batch aggregation for suitable analytic workloads. That method solves a different requirement: a SQL Server analytics workload aggregates hundreds of millions of mostly read-only event rows, and a rowstore scan is expensive. The current case instead requires use range predicates on the actual partitioning key and verify partition elimination in the plan.

Question 414

The security and data engineering reviewers accept this action: Use range predicates on the actual partitioning key and verify partition elimination in the plan. Given that a large log table is partitioned by ingestion month, but queries to one month still scan all partitions. Which technical principle most directly explains why it works?

  1. Ledger records support tamper-evidence through transaction history and cryptographic verification
  2. Pruning avoids unrelated partitions when predicates align with partition boundaries
  3. Temporal tables automatically retain row histories according to their versioning contract
  4. Database constraints protect invariants across all writers rather than one application path

Explanation

Correct Answer

B:

Pruning avoids unrelated partitions when predicates align with partition boundaries. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: the plan accesses only partitions covering the requested month.

Incorrect Answers

A:

Ledger records support tamper-evidence through transaction history and cryptographic verification. That principle is applicable when a SQL Server compliance ledger must provide tamper-evidence for historical financial entries without trusting application logs alone. It does not explain the selected change in the current case, which depends on pruning avoids unrelated partitions when predicates align with partition boundaries.

C:

Temporal tables automatically retain row histories according to their versioning contract. That principle is applicable when a SQL Server help desk must query an account's value as it existed at a previous point in time after legitimate updates. It does not explain the selected change in the current case, which depends on pruning avoids unrelated partitions when predicates align with partition boundaries.

D:

Database constraints protect invariants across all writers rather than one application path. That principle is applicable when an order service must reject negative quantities even when callers bypass the API and write directly to the database. It does not explain the selected change in the current case, which depends on pruning avoids unrelated partitions when predicates align with partition boundaries.

Question 415

An incident post-change check is required for this fix: Use range predicates on the actual partitioning key and verify partition elimination in the plan. The check must catch this potential failure: Applying an unrelated function to the partition key can prevent useful elimination. Which observed outcome demonstrates the desired behavior?

  1. A second INSERT using an existing invoice number is rejected
  2. The indexed property predicate returns correct customers with fewer reads than a full scan
  3. The plan accesses only partitions covering the requested month
  4. Representative searches use the intended expression index with fewer scanned rows

Explanation

Correct Answer

C:

The plan accesses only partitions covering the requested month. This is the direct acceptance criterion because pruning avoids unrelated partitions when predicates align with partition boundaries. The validation should also distinguish the failure condition: applying an unrelated function to the partition key can prevent useful elimination.

Incorrect Answers

A:

A second INSERT using an existing invoice number is rejected. That observation would validate a different requirement: a billing app must ensure no two invoices share the same external invoice number across concurrent writers. Here the required evidence is the plan accesses only partitions covering the requested month.

B:

The indexed property predicate returns correct customers with fewer reads than a full scan. That observation would validate a different requirement: an Azure SQL customer table stores JSON preferences and filters thousands of times per hour by a commonly queried country property. Here the required evidence is the plan accesses only partitions covering the requested month.

D:

Representative searches use the intended expression index with fewer scanned rows. That observation would validate a different requirement: a SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression. Here the required evidence is the plan accesses only partitions covering the requested month.

Question 416

The operational test fails because: Applying an unrelated function to the partition key can prevent useful elimination. The actual requirement is: A large log table is partitioned by ingestion month, but queries to one month still scan all partitions. Which corrective implementation addresses the cause?

  1. Add a UNIQUE constraint or suitable unique index on the external invoice number
  2. Create a measured composite index with TenantId as a selective leading key and OrderDate suitable for range seeks
  3. Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path
  4. Use range predicates on the actual partitioning key and verify partition elimination in the plan

Explanation

Correct Answer

D:

Use range predicates on the actual partitioning key and verify partition elimination in the plan. Pruning avoids unrelated partitions when predicates align with partition boundaries. This directly corrects the observed failure, and success can be checked because the plan accesses only partitions covering the requested month.

Incorrect Answers

A:

Uniqueness is enforced by the engine for all database clients, including concurrent sessions. Although relevant to a billing app must ensure no two invoices share the same external invoice number across concurrent writers, this action would not correct the recorded production failure: applying an unrelated function to the partition key can prevent useful elimination. Use the target remedy instead.

B:

A seekable leading equality predicate followed by a range predicate can reduce the rows examined. Although relevant to an Azure SQL reporting table has 40 million sales rows; queries filter by TenantId and recent OrderDate but repeatedly scan the heap, this action would not correct the recorded production failure: applying an unrelated function to the partition key can prevent useful elimination. Use the target remedy instead.

C:

Indexable computed expressions can expose selective expression predicates to the optimizer. Although relevant to a SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression, this action would not correct the recorded production failure: applying an unrelated function to the partition key can prevent useful elimination. Use the target remedy instead.

Question 417

A cross-functional engineering review records the following need: Several applications depend on an existing reporting view while underlying normalized tables need to be refactored. Which implementation best satisfies this requirement?

  1. Maintain a stable, explicitly defined view projection while changing its underlying implementation
  2. Use a table-valued parameter of a defined user table type for the procedure
  3. Implement a parameterized inline table-valued function returning a table expression
  4. Limit trigger scope and prevent unwanted nested or recursive behavior while testing multirow updates

Explanation

Correct Answer

A:

A view can separate consumer query contracts from physical table organization. For this stated production need, the recommended implementation is: Maintain a stable, explicitly defined view projection while changing its underlying implementation. Evidence to look for: applications keep receiving the same column contract after the table refactor.

Incorrect Answers

B:

TVPs carry sets of strongly typed rows across a procedure call. That method solves a different requirement: an API must submit 500 inventory adjustments in one network call to a SQL Server stored procedure. The current case instead requires maintain a stable, explicitly defined view projection while changing its underlying implementation.

C:

An inline TVF exposes a composable rowset and can be joined or filtered by callers. That method solves a different requirement: a multi-tenant report must call a reusable parameterized query returning all invoices for a requested account. The current case instead requires maintain a stable, explicitly defined view projection while changing its underlying implementation.

D:

Triggers operate on sets of inserted and deleted rows and may interact through nested DML. That method solves a different requirement: an AFTER UPDATE audit trigger writes to an audit table but accidentally invokes another trigger and causes repeated writes. The current case instead requires maintain a stable, explicitly defined view projection while changing its underlying implementation.

Question 418

The database team applies the following decision: Maintain a stable, explicitly defined view projection while changing its underlying implementation. Given that several applications depend on an existing reporting view while underlying normalized tables need to be refactored. Which technical principle most directly explains why it works?

  1. A scalar function encapsulates a reusable value calculation that can be invoked in expressions
  2. A view can separate consumer query contracts from physical table organization
  3. Stored procedures encapsulate multi-statement database operations and their execution contract
  4. A DML trigger executes in response to the table modification within its transaction

Explanation

Correct Answer

B:

A view can separate consumer query contracts from physical table organization. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: applications keep receiving the same column contract after the table refactor.

Incorrect Answers

A:

A scalar function encapsulates a reusable value calculation that can be invoked in expressions. That principle is applicable when the invoice query repeats a deterministic expression returning a single derived tax band for each row. It does not explain the selected change in the current case, which depends on a view can separate consumer query contracts from physical table organization.

C:

Stored procedures encapsulate multi-statement database operations and their execution contract. That principle is applicable when order registration must validate stock, insert a reservation, and return a status through one managed database interface. It does not explain the selected change in the current case, which depends on a view can separate consumer query contracts from physical table organization.

D:

A DML trigger executes in response to the table modification within its transaction. That principle is applicable when a regulated SQL table must populate a change-audit table automatically when an UPDATE occurs even from legacy applications. It does not explain the selected change in the current case, which depends on a view can separate consumer query contracts from physical table organization.

Question 419

The deployment validation team is assessing this proposal: Maintain a stable, explicitly defined view projection while changing its underlying implementation. The check must catch this potential failure: SELECT star in a persistent contract can silently change column exposure. Which observed outcome demonstrates the desired behavior?

  1. The procedure processes the submitted batch with one call and validated row types
  2. SELECT from the TVF returns only rows for the supplied account parameter
  3. Applications keep receiving the same column contract after the table refactor
  4. A multirow UPDATE creates precisely the intended audit rows without recursion

Explanation

Correct Answer

C:

Applications keep receiving the same column contract after the table refactor. This is the direct acceptance criterion because a view can separate consumer query contracts from physical table organization. The validation should also distinguish the failure condition: sELECT star in a persistent contract can silently change column exposure.

Incorrect Answers

A:

The procedure processes the submitted batch with one call and validated row types. That observation would validate a different requirement: an API must submit 500 inventory adjustments in one network call to a SQL Server stored procedure. Here the required evidence is applications keep receiving the same column contract after the table refactor.

B:

SELECT from the TVF returns only rows for the supplied account parameter. That observation would validate a different requirement: a multi-tenant report must call a reusable parameterized query returning all invoices for a requested account. Here the required evidence is applications keep receiving the same column contract after the table refactor.

D:

A multirow UPDATE creates precisely the intended audit rows without recursion. That observation would validate a different requirement: an AFTER UPDATE audit trigger writes to an audit table but accidentally invokes another trigger and causes repeated writes. Here the required evidence is applications keep receiving the same column contract after the table refactor.

Question 420

The reviewer rejects the current behavior: SELECT star in a persistent contract can silently change column exposure. The actual requirement is: Several applications depend on an existing reporting view while underlying normalized tables need to be refactored. Which corrective implementation addresses the cause?

  1. Create a scalar function with a single scalar return value where reusable SQL abstraction is justified
  2. Implement a stored procedure with explicit parameters and transactional error handling
  3. Create a targeted AFTER UPDATE trigger that records appropriate audit details without recursively altering data
  4. Maintain a stable, explicitly defined view projection while changing its underlying implementation

Explanation

Correct Answer

D:

Maintain a stable, explicitly defined view projection while changing its underlying implementation. A view can separate consumer query contracts from physical table organization. This directly corrects the observed failure, and success can be checked because applications keep receiving the same column contract after the table refactor.

Incorrect Answers

A:

A scalar function encapsulates a reusable value calculation that can be invoked in expressions. Although relevant to the invoice query repeats a deterministic expression returning a single derived tax band for each row, this action would not correct the recorded production failure: sELECT star in a persistent contract can silently change column exposure. Use the target remedy instead.

B:

Stored procedures encapsulate multi-statement database operations and their execution contract. Although relevant to order registration must validate stock, insert a reservation, and return a status through one managed database interface, this action would not correct the recorded production failure: sELECT star in a persistent contract can silently change column exposure. Use the target remedy instead.

C:

A DML trigger executes in response to the table modification within its transaction. Although relevant to a regulated SQL table must populate a change-audit table automatically when an UPDATE occurs even from legacy applications, this action would not correct the recorded production failure: sELECT star in a persistent contract can silently change column exposure. Use the target remedy instead.

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

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