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Developing AI-Enabled Database Solutions DP-800 Practice Test 13

Question 120

An API frequently filters a JSON payload by a customer tier nested inside a document

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

  1. Implement a CHECK constraint expressing the permitted numeric or state values
  2. Define an appropriate PRIMARY KEY with the required uniqueness and nullability semantics
  3. Expose a deterministic computed JSON path value and index it appropriately for the engine
  4. Choose Unicode-compatible character storage such as NVARCHAR for the required text

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

Unicode-capable character types retain characters outside a single legacy code page and require appropriate length planning.

Question 121

A SQL workload's throughput drops after reducing a database compute tier to save cost

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

  1. A controlled conflict does not silently overwrite another user's changes and either retries safely or surfaces a conflict
  2. Injected deadlocks are retried safely and one logical order is committed exactly once
  3. Peak tests remain within response-time and resource limits at the selected service tier
  4. Separate small- and large-tenant workloads both meet latency targets without causing global regressions

Explanation

Correct Answer

C:

Saving compute cost is not safe if CPU, IO or memory limits violate service-level objectives.

Incorrect Answers

A:

Optimistic versioned isolation can reject overlapping writes, requiring idempotent retry or conflict resolution.

B:

SQL may abort one deadlock participant; retries can succeed but must not repeat non-idempotent side effects.

D:

A cached plan based on one parameter distribution may be unsuitable for another; forced plans or hints need evidence.

Question 122

A query builder needs to know how many elements an SQL vector contains before invoking an embedding function

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

  1. Use reciprocal rank fusion with documented rank constants and deduplication
  2. Introduce tested diversity or deduplication rules after tenant-filtered candidate retrieval
  3. Combine structured SQL predicates with vector retrieval using the supported filter strategy
  4. Use VECTORPROPERTY with the relevant property to inspect vector metadata

Explanation

Correct Answer

D:

Vector properties help validate dimensions and related characteristics before comparison or indexing.

Incorrect Answers

A:

RRF combines positional rankings and avoids directly adding incompatible score scales.

B:

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

C:

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

Question 123

Only active customer records are read frequently while archived records dominate a table

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

  1. Use a JSON-capable column and validate its schema and version expectations
  2. Evaluate a memory-optimized table with the correct durability and index choices
  3. Use a filtered index whose predicate matches the stable selective subset being queried
  4. Use DATETIMEOFFSET or a documented UTC-instant strategy with explicit time zone handling

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

JSON storage supports evolving attributes, but constraints and relational columns should still enforce critical business invariants.

B:

In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.

D:

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

Question 124

A shipping weight is sometimes ingested as a negative number from a faulty device

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

  1. The same event displays a consistent instant after conversion between several regional offsets
  2. Negative weights or forbidden states fail on INSERT/UPDATE and valid values succeed
  3. Two authorized consumers obtain distinct sequence values and a rollback does not incorrectly imply gaplessness
  4. A reconciliation query sums sample invoices to expected cent amounts without floating-point drift

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

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

D:

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

Question 125

A dashboard must compute a per-account child aggregation without a global group-by rewrite

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. Use DENSE_RANK OVER the specified ordering criteria
  3. Use a correlated scalar subquery for the per-parent aggregate where appropriate
  4. Use OPENJSON with an explicit WITH schema to project JSON content into relational columns

Explanation

Correct Answer

C:

A correlated subquery evaluates using the current outer-row key and may be optimized differently from explicit joins.

Incorrect Answers

A:

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

B:

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

D:

OPENJSON shreds objects or arrays into rows and typed columns when a schema is supplied.

Question 126

A platform is evaluating event-driven SQL change processing without frequent polling

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

  1. A sample query retrieves the expected nested orders and unauthorized relationships remain unavailable
  2. A test insert produces the expected event and the subscriber can replay or recover according to its contract
  3. The role can GET permitted orders but cannot query or mutate unexposed tables
  4. A production health test connects to the intended database without secrets in container images

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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

C:

DAB entity mapping and permissions limit accessible objects and operations, complementing SQL grants.

D:

Configuration separation allows consistent entities while credentials and endpoints differ securely across environments.

Question 127

A security team needs to query SQL performance logs alongside DAB request telemetry over a month

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

  1. A KQL investigation retrieves matched endpoint and database events across the required time window
  2. A controlled incident generates one routed alert with enough context to triage the failing dependency
  3. The endpoint invokes only the permitted procedure and rejects unauthorized table writes
  4. The deployed runtime exposes only configured entities and handles expected basic requests

Explanation

Correct Answer

A:

Log Analytics supports queryable cross-resource telemetry and Azure Monitor alerting.

Incorrect Answers

B:

Actionable alerts require measurable thresholds, destinations and noise controls rather than generic dashboards alone.

C:

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

D:

DAB reads configuration to expose chosen database objects as endpoints, subject to role and permission controls.

Question 128

Data owners must prioritize encryption, retention and restricted access for the most sensitive SQL columns

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

  1. Prompt-injection test requests fail to perform prohibited SQL changes and are recorded for review
  2. Both an unapproved network source and an unauthorized identity fail independently
  3. Authorized SQL decryption returns the correct value while permissions block unauthorized key use
  4. A sample inventory maps confidential columns to approved policies and restricted roles

Explanation

Correct Answer

D:

Information classification guides which columns require stricter access, masking, encryption and auditing.

Incorrect Answers

A:

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

B:

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

C:

Server-side column encryption is different from Always Encrypted: the engine may decrypt for authorized server operations.

Question 129

A scheduled deployment should use a known reviewed build rather than the latest unverified developer branch

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

  1. Separate environment configuration and connection authentication from the versioned SQL model
  2. Configure deployment triggers and environment approval gates for production
  3. Inspect the deployment plan and block unapproved data-loss operations
  4. Deploy only immutable approved artifacts with a trigger and approval policy matching release intent

Explanation

Correct Answer

D:

Decoupling build and deploy improves traceability and avoids publishing unreviewed source.

Incorrect Answers

A:

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

B:

CI can build frequently while CD must respect protected environments, approvals and test conditions.

C:

Automated schema comparisons may propose destructive changes that need explicit approval and migration planning.

Question 130

A customer-support model receives SQL rows but each row lacks a record identifier for attribution

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

  1. A deployment review confirms prompts remain in approved processing boundaries and logs retain only permitted data
  2. An updated policy source appears in a cited answer and a conflicting old policy is not used
  3. Every factual assertion in the controlled test can be traced to the corresponding permitted source row
  4. A malicious model response cannot perform a write and only approved validated updates are executed

Explanation

Correct Answer

C:

Source metadata supports provenance checks and keeps generated statements linked to authorized records.

Incorrect Answers

A:

Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.

B:

RAG supplies relevant external context at answer time, reducing dependence on stale model memory but not guaranteeing truth.

D:

Model output is untrusted data and must not be treated as authorized executable SQL.

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

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