DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A tax calculation accepts one order amount and returns one decimal rate-adjusted value
Which SQL design or implementation decision most directly addresses this requirement?
Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.
NOCOUNT suppresses DONEINPROC row-count chatter without changing @@ROWCOUNT semantics.
Views and TVFs are relational query sources; stored procedures are invoked with EXEC and do not act as arbitrary table expressions.
T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.
A database slows during end-of-month processing and teams cannot identify whether IO or lock waits dominate
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
DMVs expose current and cumulative SQL diagnostics that help distinguish contention from capacity or query-plan issues.
Performance changes need controlled before-and-after measurement because cache, concurrency and statistics distort comparisons.
SQL may abort one deadlock participant; retries can succeed but must not repeat non-idempotent side effects.
Blocking is caused by incompatible locks; addressing the head blocker is different from killing every waiting request.
A deployment adds a new reference row required by the application after schema changes
Which SQL design or implementation decision most directly addresses this requirement?
Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.
Policy-enforced reviews prevent bypassing designated security and database approvers.
Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.
Backward-compatible intermediate schema lets mixed app versions operate safely until a later cleanup.
A deployment has dependent database schemas stored in separate repositories
Which SQL design or implementation decision most directly addresses this requirement?
Project references inform build-time symbol resolution and make schema dependencies explicit.
Build success does not prove connections, permissions, seed data and business workflows work together.
SDK-style project definitions simplify consistent tooling and package references while preserving project build semantics.
Automated schema comparisons may propose destructive changes that need explicit approval and migration planning.
An application must invoke a validated SQL stored procedure through REST while hiding its internal tables
Which SQL design or implementation decision most directly addresses this requirement?
DAB can expose approved programmable objects while caller identity and database permissions enforce access.
API filtering reduces unnecessary result transfer but cannot replace server-side authorization.
SQL trigger bindings react to detected table changes and require correct change tracking and idempotent handler logic.
Caching reduces repeat database load but introduces staleness and must avoid exposing user-specific sensitive results.
An internal assistant's SQL tool accepts free-form requests and can modify schema without approval
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.
Managed identity supplies short-lived identity-based credentials without a long-lived application password.
A DENY generally overrides an inherited GRANT for an ordinary user; exceptional cases require explicit security review.
Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.
A tuning report claims success after one atypical test executed without realistic row volumes
Which SQL design or implementation decision most directly addresses this requirement?
Performance changes need controlled before-and-after measurement because cache, concurrency and statistics distort comparisons.
Latency symptoms may come from blocking, execution plans, throttling or network; one symptom cannot establish root cause.
Efficient row identification can shorten lock holding; excess indexes can slow writes and require balanced tuning.
Saving compute cost is not safe if CPU, IO or memory limits violate service-level objectives.
An AI inventory search must refresh embeddings after any meaningful description edit
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Embedding freshness requires detecting source changes and re-embedding only changed meaningful content.
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
A larger model is not automatically best; task complexity and throughput determine a suitable choice.
A text-only model cannot directly process raw images, while multimodal inputs require tested format, cost and safety handling.
A JSON payload stores nested objects and an API needs a nested array fragment intact
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
JSON_QUERY returns a JSON fragment such as an array/object while JSON_VALUE returns a scalar.
REGEXP_LIKE evaluates a regex match, including anchors that constrain the whole input rather than just a substring.
JSON_OBJECT produces correctly structured JSON property/value pairs and avoids manual quoting errors.
Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.
A content pipeline must notify several business systems before vector generation completes
Which SQL design or implementation decision most directly addresses this requirement?
Logic Apps coordinates cross-service actions and retries but does not eliminate the need for idempotency.
Vector similarity does not enforce authorization; retrieval still needs tenant/ACL filters.
A governed model object can centralize endpoint and identity parameters for supported SQL AI operations.
Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.
An embedding index contains deleted documents because the update pipeline only handles inserts
Which SQL design or implementation decision most directly addresses this requirement?
Index freshness includes removal as well as addition and edits; stale documents can yield harmful answers.
Answer-generation quality cannot reveal all retrieval failures; ranking metrics provide direct measurement.
DiskANN is an approximate-neighbor indexing approach, not a substitute for valid model dimensions and authorization.
Late filtering after global top-K can leak unauthorized results or starve legitimate tenant matches.
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