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Developing AI-Enabled Database Solutions DP-800 Practice Test 95

Question 940

An OLTP table is queried through a date predicate but the column is wrapped in a conversion function

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

  1. Define a DEFAULT constraint for the column with an appropriate expression
  2. Rewrite the predicate into a sargable range on the original indexed column
  3. Configure an IDENTITY column with suitable seed and increment while treating values as identifiers, not gapless sequence numbers
  4. Choose a clustered index key appropriate to the prevalent access pattern and insert behavior

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.

C:

Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.

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 941

A customer query includes a mandatory date range in addition to semantic similarity

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

  1. Result sets match both the semantic relevance threshold and the exact date predicate
  2. Measured storage and indexing capacity meet the documented volume and growth budget
  3. CPU use decreases while the returned ranking remains unchanged in a controlled comparison
  4. Labeled ranking fixtures confirm the chosen metric produces intended neighbors

Explanation

Correct Answer

A:

Semantic relevance does not replace mandatory structured filters such as date, category or tenant.

Incorrect Answers

B:

Vector column dimension and element representation drive base storage and index footprint, not row count alone.

C:

Repeated per-query transformation wastes compute when the model and representation are stable.

D:

Cosine, Euclidean and dot-product measures are not universally interchangeable unless normalization assumptions hold.

Question 942

A change compiles in the developer database but fails when deployed because an object reference is missing

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

  1. The app completes representative create/read/update operations against a freshly deployed test database
  2. A containerized CI build produces the same validated database model artifact from a clean clone
  3. A PR that references a nonexistent column fails validation and cannot pass the release gate
  4. A clean target receives the approved schema and a drift report matches the expected model

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

Build success does not prove connections, permissions, seed data and business workflows work together.

B:

SDK-style project definitions simplify consistent tooling and package references while preserving project build semantics.

D:

A DACPAC packages the declarative database model used by supported deployment tools.

Question 943

An assistant is issued a database credential with db_owner permission merely to inspect table shapes

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

  1. The session displays the approved model and request logs show no traffic to disallowed providers
  2. A repository scan finds no plaintext credentials and a test connection still succeeds under approved identity
  3. A test of destructive operations fails while metadata lookup still functions
  4. An audit query correlates the authorized user, selected MCP tool and schema action without exposing secret payloads

Explanation

Correct Answer

C:

Least privilege reduces the impact of prompt injection, mistaken tool calls and credential disclosure.

Incorrect Answers

A:

Model choice affects capability and governance, and prompts must stay within the approved service boundary.

B:

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

D:

Traceable AI-assisted operations support accountability while logs require access and retention controls.

Question 944

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

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

  1. Define an appropriate PRIMARY KEY with the required uniqueness and nullability semantics
  2. Use DATETIMEOFFSET or a documented UTC-instant strategy with explicit time zone handling
  3. Implement a CHECK constraint expressing the permitted numeric or state values
  4. Implement a system-versioned temporal table with a period and history table

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.

C:

Database check predicates reject invalid stored values regardless of which client sent the write.

D:

System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.

Question 945

A schema project references tables from another project and treats those names as unresolved

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

  1. A failed canary is recovered without losing committed transactions or leaving incompatible schema
  2. The drift report identifies every unexpected object and the team reconciles intended changes before publishing
  3. Running the deployment twice leaves one expected seed row and the correct feature flags
  4. The build resolves referenced objects and fails predictably if an incompatible referenced schema changes

Explanation

Correct Answer

D:

Project references inform build-time symbol resolution and make schema dependencies explicit.

Incorrect Answers

A:

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

B:

Schema drift is divergence between the target and the model; blind publish may remove legitimate hotfixes.

C:

Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.

Question 946

A developer adds raw BM25 scores to cosine similarity numbers without normalizing them

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

  1. Introduce tested diversity or deduplication rules after tenant-filtered candidate retrieval
  2. Evaluate retrieval precision, recall-at-k and relevance against a labeled question corpus
  3. Combine lexical and semantic retrieval in a hybrid search pipeline
  4. Use rank-based fusion or calibrated score normalization before merging lexical and vector results

Explanation

Correct Answer

D:

Raw keyword and vector scores may have different ranges and meanings, so naive addition can bias results.

Incorrect Answers

A:

Near-duplicate chunks can crowd top-K slots and lower answer coverage even with accurate vector ranking.

B:

Answer-generation quality cannot reveal all retrieval failures; ranking metrics provide direct measurement.

C:

Hybrid retrieval can leverage exact-term precision and vector semantic recall if results are merged sensibly.

Question 947

A DAB endpoint receives identical requests and teams need controlled cache freshness

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

  1. Representative search requests return expected records within the query budget
  2. Repeated catalog requests reduce SQL load and changed items become visible within the accepted staleness limit
  3. Replaying the same change does not duplicate business data and checkpoint recovery catches up accurately
  4. An inserted, updated and deleted fixture produces the expected downstream CDC records

Explanation

Correct Answer

B:

Caching reduces repeat database load but introduces staleness and must avoid exposing user-specific sensitive results.

Incorrect Answers

A:

Search capability should use approved fields and query limits rather than exposing arbitrary free-form SQL.

C:

At-least-once delivery and retries require idempotent consumers rather than relying on exactly-once invocation.

D:

CDC records changes from the transaction log for downstream consumption, but latency and retention need management.

Question 948

An existing legacy project uses nonstandard build files and tooling cannot discover SQL project dependencies

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

  1. Separate environment configuration and connection authentication from the versioned SQL model
  2. Use an expand-and-contract compatible schema migration with a staged backfill
  3. Adopt an appropriate SDK-style SQL Database Project configuration where supported
  4. Use workload identity federation or approved short-lived credentials with least privilege

Explanation

Correct Answer

C:

SDK-style project definitions simplify consistent tooling and package references while preserving project build semantics.

Incorrect Answers

A:

A consistent schema artifact should be promoted while environment-specific values are provided securely at deployment.

B:

Backward-compatible intermediate schema lets mixed app versions operate safely until a later cleanup.

D:

Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.

Question 949

Regulators require tamper-evident evidence of changes to financial records

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

  1. A ledger verification detects a controlled unauthorized modification attempt against a trusted digest
  2. Two authorized consumers obtain distinct sequence values and a rollback does not incorrectly imply gaplessness
  3. Attempts to store NULL for a required column fail while optional NULL attributes remain valid
  4. A duplicate active business identifier is rejected while distinct identifiers remain insertable

Explanation

Correct Answer

A:

Ledger adds cryptographic evidence for changes, but access governance and external digest retention remain essential.

Incorrect Answers

B:

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

C:

Nullability is a core schema invariant and should not be delegated solely to an API form.

D:

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

Question 950

A managed endpoint is private but a broad service identity can invoke models not assigned to its project

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

  1. Both an unapproved network source and an unauthorized identity fail independently
  2. A restarted workload connects using its assigned principal and no SQL password is present in deployment secrets
  3. An impersonation test confirms confidential SELECT fails and approved access paths still succeed
  4. An attempted ALTER or DROP is denied while required SELECT queries continue to work

Explanation

Correct Answer

A:

Network restrictions limit reachability while scoped credentials decide who can invoke supported operations.

Incorrect Answers

B:

Managed identity supplies short-lived identity-based credentials without a long-lived application password.

C:

A DENY generally overrides an inherited GRANT for an ordinary user; exceptional cases require explicit security review.

D:

Overprivileged built-in roles broaden the blast radius of compromises and accidental statements.

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

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