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Developing AI-Enabled Database Solutions DP-800 Practice Test 52

Question 510

An auditing trigger causes nested execution loops when writes to the audit table invoke another trigger

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

  1. Use a view or table-valued function when a relation must participate in JOIN operations
  2. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions
  3. Constrain trigger logic and recursion behavior to prevent unintended reentry
  4. Use SCHEMABINDING on the appropriate view where stable underlying schema is required

Explanation

Correct Answer

C:

Uncontrolled trigger nesting can cause excess DML, recursion failures, and transactional contention.

Incorrect Answers

A:

Views and TVFs are relational query sources; stored procedures are invoked with EXEC and do not act as arbitrary table expressions.

B:

T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.

D:

Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.

Question 511

A legacy reporting view intercepts a write and needs to redirect it to normalized underlying tables

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

  1. Create a view encapsulating the reusable SELECT and grant access to the view as appropriate
  2. Use an INSTEAD OF trigger only when deliberate view-write translation is required
  3. Pass the set with a user-defined table type and table-valued parameter
  4. Implement a focused AFTER trigger using inserted and deleted logical tables where justified

Explanation

Correct Answer

B:

INSTEAD OF triggers replace the original DML action and must implement the full intended persistence behavior.

Incorrect Answers

A:

Views centralize a logical query definition without storing an independent copy of rows by default.

C:

TVPs provide typed relational input for multirow procedure operations without ad hoc concatenated SQL.

D:

DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.

Question 512

Two developers edit the same SQL procedure and direct pushes overwrite each other's changes

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

  1. An unauthorized PR cannot merge sensitive schema changes without the required owner approval
  2. A failed canary is recovered without losing committed transactions or leaving incompatible schema
  3. A PR that references a nonexistent column fails validation and cannot pass the release gate
  4. No unreviewed direct main-branch change is accepted and merged schema builds successfully

Explanation

Correct Answer

D:

Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.

Incorrect Answers

A:

Policy-enforced reviews prevent bypassing designated security and database approvers.

B:

Schema rollback can be unsafe after new writes; recoverability must be designed before a high-risk change.

C:

Compilation catches many missing symbols and invalid references before a DACPAC is deployed.

Question 513

Database audit records are kept in the same writable store as the application administrator's data

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

  1. Repeating encryption for the same plaintext does not produce a stable equality pattern, and authorized clients can decrypt
  2. Authorized equality queries find the intended record without disclosing plaintext to the server
  3. The service can execute its approved procedure but SELECT from the sensitive base table is denied
  4. A privileged app principal cannot alter or erase protected historical audit records

Explanation

Correct Answer

D:

Separating audit custody from operational administrators reduces the risk of tampering and premature deletion.

Incorrect Answers

A:

Randomized encryption gives stronger pattern protection at the cost of limiting server-side comparisons.

B:

Deterministic encryption enables equality comparisons for matching plaintexts but reveals equality patterns and is less private than randomized encryption.

C:

Object-level permissions enable task-specific capability without broad exposure to every table.

Question 514

An UPDATE query scans a large table to find few rows and blocks other writers

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

  1. A concurrency benchmark shows fewer blocked writers and acceptable insert/update throughput
  2. The estimated row count approaches measured rows and representative query elapsed time improves
  3. Read and update workloads overlap without dirty reads or unacceptable version-store pressure
  4. Concurrent database updates finish faster and transaction durations fall without breaking atomicity

Explanation

Correct Answer

A:

Efficient row identification can shorten lock holding; excess indexes can slow writes and require balanced tuning.

Incorrect Answers

B:

Statistics provide distribution estimates that influence cardinality and join strategy choices.

C:

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

D:

Long transactions hold locks and version state, worsening throughput and blocking.

Question 515

JSON events contain a scalar priority at path $.incident.severity

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

  1. Use JSON_OBJECT to build object properties rather than concatenate unescaped strings
  2. Extract the scalar with JSON_VALUE and use appropriate type conversion and validation
  3. Evaluate JARO_WINKLER_DISTANCE for a name-similarity signal alongside business checks
  4. Define a window aggregate with an explicit ROWS frame and ordered partition

Explanation

Correct Answer

B:

JSON_VALUE reads scalar values at a specified JSON path; non-scalar fragments need a different interface.

Incorrect Answers

A:

JSON_OBJECT produces correctly structured JSON property/value pairs and avoids manual quoting errors.

C:

Jaro-Winkler style similarity rewards matching character patterns and helps with transpositions but cannot prove identity.

D:

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

Question 516

A data-access function has several staged relational transformations and needs a table return

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

  1. Keep the calculation in a side-effect-free SQL function consistent with UDF restrictions
  2. Wrap the related writes in BEGIN TRANSACTION with TRY/CATCH and appropriate rollback
  3. Use an inline table-valued function with a parameter and a relational SELECT body
  4. Assess a multistatement TVF only when necessary and compare it with an inline TVF

Explanation

Correct Answer

D:

Multistatement TVFs can introduce estimation and optimization limitations, so an inline form is preferred when expressive enough.

Incorrect Answers

A:

T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.

B:

An explicit transaction and consistent failure policy enforce atomicity across multiple statements.

C:

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

Question 517

A frontend wants to traverse an approved parent-child relationship using a typed GraphQL field

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

  1. A filtered request returns only matching permitted rows and disallowed fields remain inaccessible
  2. The endpoint invokes only the permitted procedure and rejects unauthorized table writes
  3. A test insert produces the expected event and the subscriber can replay or recover according to its contract
  4. A sample query retrieves the expected nested orders and unauthorized relationships remain unavailable

Explanation

Correct Answer

D:

GraphQL relationships make defined SQL relations traversable through the API without arbitrary client SQL.

Incorrect Answers

A:

API filtering reduces unnecessary result transfer but cannot replace server-side authorization.

B:

DAB can expose approved programmable objects while caller identity and database permissions enforce access.

C:

CES can publish database changes into an event architecture, but supported platform and ordering guarantees must be checked.

Question 518

An event history must identify the next stage after each transaction in the same customer stream

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

  1. Use ROW_NUMBER partitioned by the entity and ordered by descending event time with a tie-breaker
  2. Use LEAD with partition and order to access the following row
  3. Use REGEXP_SUBSTR with a defined regex to extract the matching segment
  4. Use EDIT_DISTANCE to evaluate edit-operation differences before choosing a threshold

Explanation

Correct Answer

B:

LEAD returns a later row in an ordered window and avoids complicated self-joins.

Incorrect Answers

A:

Window numbering can select one row per logical partition while a deterministic secondary sort resolves equal timestamps.

C:

REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.

D:

Edit distance measures changes required to transform a string and must not be confused with semantic meaning.

Question 519

A team wants to query external data without continuously copying it into an operational table

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

  1. Month-filtered plans show partition elimination and the oldest eligible partition is archived safely
  2. The actual plan no longer performs the expensive key lookup for the representative query
  3. A permitted cross-source SELECT returns expected rows and failure handling is verified for an unavailable source
  4. The execution plan uses an appropriate clustered seek and measured insert costs remain acceptable

Explanation

Correct Answer

C:

External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.

Incorrect Answers

A:

Partition elimination can narrow scans and partition switching can simplify retention when indexes align.

B:

Covering indexes can avoid residual lookups while keeping included attributes out of the search-key ordering.

D:

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

Question 520

A status dashboard repeatedly filters on an indexed timestamp yet plans show scans

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

  1. Choose RANGE LEFT or RANGE RIGHT deliberately and test equality at boundary values
  2. Rewrite the predicate into a sargable range on the original indexed column
  3. Add a FOREIGN KEY with deliberate delete/update behavior between detail and parent keys
  4. Use a SEQUENCE and request values explicitly where shared preallocation is required

Explanation

Correct Answer

B:

Avoiding functions on the indexed search column can let the optimizer use an index seek.

Incorrect Answers

A:

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

C:

Referential constraints ensure stored relationships point to permitted parent keys and avoid orphan records.

D:

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

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