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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.
$65.99
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Developing AI-Enabled Database Solutions DP-800 Practice Test 41

Question 400

The operational test fails because: Wrapping a raw column in a non-sargable function may prevent an ordinary index seek. The actual requirement is: A SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression. Which corrective implementation addresses the cause?

  1. Align partition function, scheme, table and necessary indexes on the monthly boundary
  2. Use range predicates on the actual partitioning key and verify partition elimination in the plan
  3. Use JSON_VALUE with the correct JSON path and consider missing or invalid properties
  4. Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path

Explanation

Correct Answer

D:

Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path. Indexable computed expressions can expose selective expression predicates to the optimizer. This directly corrects the observed failure, and success can be checked because representative searches use the intended expression index with fewer scanned rows.

Incorrect Answers

A:

Aligned partitioning permits supported partition-level data movement and pruning. Although relevant to a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival, this action would not correct the recorded production failure: wrapping a raw column in a non-sargable function may prevent an ordinary index seek. Use the target remedy instead.

B:

Pruning avoids unrelated partitions when predicates align with partition boundaries. Although relevant to a large log table is partitioned by ingestion month, but queries to one month still scan all partitions, this action would not correct the recorded production failure: wrapping a raw column in a non-sargable function may prevent an ordinary index seek. Use the target remedy instead.

C:

JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. Although relevant to an application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document, this action would not correct the recorded production failure: wrapping a raw column in a non-sargable function may prevent an ordinary index seek. Use the target remedy instead.

Question 401

A cross-functional engineering review records the following need: A SQL Server help desk must query an account's value as it existed at a previous point in time after legitimate updates. Which implementation best satisfies this requirement?

  1. Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions
  2. Align partition function, scheme, table and necessary indexes on the monthly boundary
  3. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs
  4. Create a database SEQUENCE and request NEXT VALUE FOR it during insertion

Explanation

Correct Answer

A:

Temporal tables automatically retain row histories according to their versioning contract. For this stated production need, the recommended implementation is: Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions. Evidence to look for: a historical query returns the old value while a current query returns the new value.

Incorrect Answers

B:

Aligned partitioning permits supported partition-level data movement and pruning. That method solves a different requirement: a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival. The current case instead requires use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions.

C:

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 a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions.

D:

A sequence allocates values independently of a user-managed maximum and can cache allocations. That method solves a different requirement: a ticketing service needs unique monotonic numeric identifiers across multiple inserting sessions without using a table-wide MAX-plus-one lookup. The current case instead requires use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions.

Question 402

The database team applies the following decision: Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions. Given that a SQL Server help desk must query an account's value as it existed at a previous point in time after legitimate updates. Which technical principle most directly explains why it works?

  1. Indexable computed expressions can expose selective expression predicates to the optimizer
  2. Temporal tables automatically retain row histories according to their versioning contract
  3. JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array
  4. Pruning avoids unrelated partitions when predicates align with partition boundaries

Explanation

Correct Answer

B:

Temporal tables automatically retain row histories according to their versioning contract. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: a historical query returns the old value while a current query returns the new value.

Incorrect Answers

A:

Indexable computed expressions can expose selective expression predicates to the optimizer. That principle is applicable when a SQL query repeatedly filters on a normalized expression of an indexed business key and the runtime repeatedly computes the expression. It does not explain the selected change in the current case, which depends on temporal tables automatically retain row histories according to their versioning contract.

C:

JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. That principle is applicable when an application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document. It does not explain the selected change in the current case, which depends on temporal tables automatically retain row histories according to their versioning contract.

D:

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 temporal tables automatically retain row histories according to their versioning contract.

Question 403

The deployment validation team is assessing this proposal: Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions. The check must catch this potential failure: An ordinary table without historical tracking cannot reconstruct overwritten values. Which observed outcome demonstrates the desired behavior?

  1. The representative query plan uses a selective index access and logical reads fall
  2. The indexed property predicate returns correct customers with fewer reads than a full scan
  3. A historical query returns the old value while a current query returns the new value
  4. A direct INSERT with negative Quantity fails while valid rows succeed

Explanation

Correct Answer

C:

A historical query returns the old value while a current query returns the new value. This is the direct acceptance criterion because temporal tables automatically retain row histories according to their versioning contract. The validation should also distinguish the failure condition: an ordinary table without historical tracking cannot reconstruct overwritten values.

Incorrect Answers

A:

The representative query plan uses a selective index access and logical reads fall. That observation would validate 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. Here the required evidence is a historical query returns the old value while a current query returns the new value.

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 a historical query returns the old value while a current query returns the new value.

D:

A direct INSERT with negative Quantity fails while valid rows succeed. That observation would validate a different requirement: an order service must reject negative quantities even when callers bypass the API and write directly to the database. Here the required evidence is a historical query returns the old value while a current query returns the new value.

Question 404

The reviewer rejects the current behavior: An ordinary table without historical tracking cannot reconstruct overwritten values. The actual requirement is: A SQL Server help desk must query an account's value as it existed at a previous point in time after legitimate updates. Which corrective implementation addresses the cause?

  1. Add a UNIQUE constraint or suitable unique index on the external invoice number
  2. Align partition function, scheme, table and necessary indexes on the monthly boundary
  3. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs
  4. Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions

Explanation

Correct Answer

D:

Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions. Temporal tables automatically retain row histories according to their versioning contract. This directly corrects the observed failure, and success can be checked because a historical query returns the old value while a current query returns the new value.

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: an ordinary table without historical tracking cannot reconstruct overwritten values. Use the target remedy instead.

B:

Aligned partitioning permits supported partition-level data movement and pruning. Although relevant to a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival, this action would not correct the recorded production failure: an ordinary table without historical tracking cannot reconstruct overwritten values. Use the target remedy instead.

C:

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: an ordinary table without historical tracking cannot reconstruct overwritten values. Use the target remedy instead.

Question 405

A development review identifies this database requirement: An application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document. Which implementation best satisfies this requirement?

  1. Use JSON_VALUE with the correct JSON path and consider missing or invalid properties
  2. Create a persisted or otherwise indexable computed-column strategy on a supported engine and rewrite to use its access path
  3. Use a system-versioned temporal table and a FOR SYSTEM_TIME query for historical versions
  4. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs

Explanation

Correct Answer

A:

JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. For this stated production need, the recommended implementation is: Use JSON_VALUE with the correct JSON path and consider missing or invalid properties. Evidence to look for: valid nested region values appear and missing paths receive the expected null handling.

Incorrect Answers

B:

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 JSON_VALUE with the correct JSON path and consider missing or invalid properties.

C:

Temporal tables automatically retain row histories according to their versioning contract. That method solves 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. The current case instead requires use JSON_VALUE with the correct JSON path and consider missing or invalid properties.

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 JSON_VALUE with the correct JSON path and consider missing or invalid properties.

Question 406

The engineer chooses the following change: Use JSON_VALUE with the correct JSON path and consider missing or invalid properties. Given that an application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document. Which technical principle most directly explains why it works?

  1. Ledger records support tamper-evidence through transaction history and cryptographic verification
  2. JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array
  3. Pruning avoids unrelated partitions when predicates align with partition boundaries
  4. A sequence allocates values independently of a user-managed maximum and can cache allocations

Explanation

Correct Answer

B:

JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: valid nested region values appear and missing paths receive the expected null handling.

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 jSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array.

C:

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 jSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array.

D:

A sequence allocates values independently of a user-managed maximum and can cache allocations. That principle is applicable when a ticketing service needs unique monotonic numeric identifiers across multiple inserting sessions without using a table-wide MAX-plus-one lookup. It does not explain the selected change in the current case, which depends on jSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array.

Question 407

A staging acceptance test is being designed for this change: Use JSON_VALUE with the correct JSON path and consider missing or invalid properties. The check must catch this potential failure: OPENJSON with a rowset schema is unnecessary for simple scalar extraction. Which observed outcome demonstrates the desired behavior?

  1. Concurrent inserts receive distinct allocated sequence numbers under normal use
  2. The closed monthly partition can be managed without touching unrelated months
  3. Valid nested region values appear and missing paths receive the expected null handling
  4. A second INSERT using an existing invoice number is rejected

Explanation

Correct Answer

C:

Valid nested region values appear and missing paths receive the expected null handling. This is the direct acceptance criterion because jSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. The validation should also distinguish the failure condition: oPENJSON with a rowset schema is unnecessary for simple scalar extraction.

Incorrect Answers

A:

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 valid nested region values appear and missing paths receive the expected null handling.

B:

The closed monthly partition can be managed without touching unrelated months. That observation would validate a different requirement: a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival. Here the required evidence is valid nested region values appear and missing paths receive the expected null handling.

D:

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 valid nested region values appear and missing paths receive the expected null handling.

Question 408

The production rollout exhibits this defect: OPENJSON with a rowset schema is unnecessary for simple scalar extraction. The actual requirement is: An application accepts customer preference JSON, and a read query must return a scalar nested region safely from each document. Which corrective implementation addresses the cause?

  1. Align partition function, scheme, table and necessary indexes on the monthly boundary
  2. Add a CHECK constraint enforcing Quantity greater than zero on the table
  3. Evaluate a clustered columnstore index on the analytic fact table after testing mixed workload needs
  4. Use JSON_VALUE with the correct JSON path and consider missing or invalid properties

Explanation

Correct Answer

D:

Use JSON_VALUE with the correct JSON path and consider missing or invalid properties. JSON_VALUE extracts a scalar at a requested JSON path rather than expanding an array. This directly corrects the observed failure, and success can be checked because valid nested region values appear and missing paths receive the expected null handling.

Incorrect Answers

A:

Aligned partitioning permits supported partition-level data movement and pruning. Although relevant to a SQL Server fact table contains several years of events and data managers need to switch out one closed month for archival, this action would not correct the recorded production failure: oPENJSON with a rowset schema is unnecessary for simple scalar extraction. Use the target remedy instead.

B:

Database constraints protect invariants across all writers rather than one application path. Although relevant to an order service must reject negative quantities even when callers bypass the API and write directly to the database, this action would not correct the recorded production failure: oPENJSON with a rowset schema is unnecessary for simple scalar extraction. Use the target remedy instead.

C:

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: oPENJSON with a rowset schema is unnecessary for simple scalar extraction. Use the target remedy instead.

Question 409

The SQL platform team receives the following production requirement: A billing app must ensure no two invoices share the same external invoice number across concurrent writers. Which implementation best satisfies this requirement?

  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. Extract the queried JSON property into an indexable expression or supported JSON index strategy after evaluating the platform

Explanation

Correct Answer

A:

Uniqueness is enforced by the engine for all database clients, including concurrent sessions. For this stated production need, the recommended implementation is: Add a UNIQUE constraint or suitable unique index on the external invoice number. Evidence to look for: a second insert using an existing invoice number is rejected.

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 add a UNIQUE constraint or suitable unique index on the external invoice number.

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 add a UNIQUE constraint or suitable unique index on the external invoice number.

D:

Indexable JSON access paths reduce repeated full parsing and scans for selective property filters. That method solves a different requirement: an Azure SQL customer table stores JSON preferences and filters thousands of times per hour by a commonly queried country property. The current case instead requires add a UNIQUE constraint or suitable unique index on the external invoice number.

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.

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

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