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Developing AI-Enabled Database Solutions DP-800 Practice Test 33

Question 320

A retrieved database description attempts to change the assistant's system instructions

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

  1. A test assistant can inspect allowed metadata but cannot invoke a data mutation operation
  2. A seeded malicious comment does not trigger export or additional tool invocation
  3. An authenticated test can list authorized metadata but cannot enumerate other customers' workspaces
  4. A repository scan finds no plaintext credentials and a test connection still succeeds under approved identity

Explanation

Correct Answer

B:

Prompt injection in tool output must not grant new authority or override the application trust boundary.

Incorrect Answers

A:

Model Context Protocol tools amplify backend permissions and should be least-privilege for AI workflows.

C:

AI-tool access should follow user authorization and workspace boundaries rather than tool availability alone.

D:

Secrets in repository configuration can be leaked or copied; managed credentials reduce exposure and support rotation.

Question 321

A new inventory table needs a canonical identifier that other tables may reference

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

  1. The actual plan seeks using the indexed JSON property while returning the same matching document IDs
  2. Duplicate and NULL primary-key inserts are rejected while valid referenced rows persist
  3. A representative query returns identical results and shows a range seek with fewer reads
  4. A reconciliation query sums sample invoices to expected cent amounts without floating-point drift

Explanation

Correct Answer

B:

A primary key uniquely identifies each row and provides a reference target; its underlying index strategy is a separate design choice.

Incorrect Answers

A:

An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.

C:

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

D:

Approximate binary floating-point types cannot represent every decimal currency value exactly; fixed-precision decimal arithmetic avoids that category of rounding error.

Question 322

A trigger works for one row but omits additional rows in a 200-row UPDATE

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

  1. JOINing the function to a caller produces the expected rows with a stable execution plan
  2. The caller receives the expected parameter value for empty, partial, and full batches
  3. A 200-row test produces 200 correct audit details with no duplicate or missing records
  4. A multirow UPDATE writes the expected before-and-after audit records once per affected row

Explanation

Correct Answer

C:

DML triggers run per statement and inserted/deleted can contain multiple rows; singleton assumptions cause data loss.

Incorrect Answers

A:

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

B:

Procedure output parameters convey scalar results in addition to result sets and return status values.

D:

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

Question 323

Chunk overlap is set to almost the entire chunk size and storage/embedding costs spike

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

  1. Retrieval comparison confirms all indexed vectors were produced by the intended model version
  2. Stored vectors match expected dimensions and request logs show the authorized model deployment
  3. Benchmark recall meets targets with fewer redundant chunks and lower embedding spend
  4. A curated multilingual question set retrieves relevant sources in each required language

Explanation

Correct Answer

C:

Excess overlap duplicates tokens and vectors; insufficient overlap may split a needed answer across boundaries.

Incorrect Answers

A:

Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.

B:

Model hosting and batch generation must align on dimensions, security boundaries and quotas.

D:

Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.

Question 324

A global product-help index must find semantically similar phrases across several languages

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

  1. Version embedding generation and rebuild or separate incompatible embedding sets
  2. Select and evaluate an embedding model with appropriate multilingual coverage
  3. Use an Azure Function with the supported SQL trigger binding and idempotent handler logic
  4. Benchmark model sizes and capabilities against accuracy, latency and total cost targets

Explanation

Correct Answer

B:

Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.

Incorrect Answers

A:

Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.

C:

Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.

D:

A larger model is not automatically best; task complexity and throughput determine a suitable choice.

Question 325

A payment posting operation must guarantee two related write operations succeed or fail together

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

  1. Successful calls update all required tables and forced errors leave no partial transaction
  2. A forced failure in the second statement restores original stock and payment records
  3. JOINing the function to a caller produces the expected rows with a stable execution plan
  4. The caller receives the expected parameter value for empty, partial, and full batches

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.

C:

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

D:

Procedure output parameters convey scalar results in addition to result sets and return status values.

Question 326

A deduplication engine must compare strings based on small insertion and deletion differences

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

  1. A cyclic fixture terminates with a controlled error or flagged cycle while valid hierarchies complete
  2. Known similar/dissimilar pairs produce the expected relative edit costs
  3. The final SELECT returns the approved set while no unwanted permanent table is created
  4. Tied sample scores produce ranks 1,2,2,3 and not rank 4 for the next group

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.

C:

A nonrecursive CTE names a logical result within one statement and does not inherently materialize persistent storage.

D:

DENSE_RANK retains equal ranks for ties while the next distinct value advances by one.

Question 327

A fact table is queried mostly by month and has several years of history

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. A duplicate active business identifier is rejected while distinct identifiers remain insertable
  3. A transaction inserting a nonexistent parent reference fails while a valid parent-child insert commits
  4. Boundary-value test rows land in the intended partition before the annual rollover job is approved

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

Uniqueness for non-primary business attributes is enforced separately from the surrogate primary key.

C:

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

D:

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

Question 328

A developer modifies a stored procedure and wants a focused test of its error branch

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

  1. Move deployment secrets to approved vault or short-lived federation and mask sensitive outputs
  2. Require feature branches and reviewed pull requests for SQL Database Project edits
  3. Create database unit tests for the changed logic and expected error paths
  4. Prepare tested backward-compatible rollback or forward-fix procedures and protect data backups

Explanation

Correct Answer

C:

Unit tests isolate programmable behavior and catch regression before full integration deployment.

Incorrect Answers

A:

CI/CD credentials are high-value attack targets and should not be stored in repository text.

B:

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

D:

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

Question 329

A service checks unprocessed work items and ignores the large processed-history portion

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

  1. Use a filtered index whose predicate matches the stable selective subset being queried
  2. Align the required indexes and partition schemes before partition-switch operations
  3. Choose a clustered index key appropriate to the prevalent access pattern and insert behavior
  4. Evaluate an external table and the required external data source and credential configuration

Explanation

Correct Answer

A:

A predicate-limited index has fewer rows to maintain and can serve a matching selective WHERE clause.

Incorrect Answers

B:

Partition switching has schema and index-alignment prerequisites; an incompatible index can block the metadata operation.

C:

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

D:

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

Question 330

An MCP endpoint can execute arbitrary SQL statements from a language-model-generated tool call

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

  1. A cross-tenant write is rejected and a same-tenant write succeeds for the same application principal
  2. Two test identities see only their own tenant rows, including queries that omit client-side tenant filters
  3. Prompt-injection test requests fail to perform prohibited SQL changes and are recorded for review
  4. A restricted principal cannot query or infer prohibited records under the combined controls

Explanation

Correct Answer

C:

Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.

Incorrect Answers

A:

RLS filter predicates address row visibility while block predicates can stop invalid INSERT/UPDATE operations.

B:

RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.

D:

Masking is a presentation control; filtering, permissions, and inference risks remain if users can query too freely.

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

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