DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A multitenant application uses one table for several customers and users must see only their tenant rows
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.
Dynamic Data Masking changes query presentation for covered low-privilege principals but is not cryptographic encryption.
Always Encrypted keeps sensitive column values inaccessible to parties lacking client-side keys, unlike server-only encryption at rest.
Auditing generates event evidence of SQL activity but must be configured for relevant actions and protected storage.
A data-access change must be verified against an application using the deployed test database
Which SQL design or implementation decision most directly addresses this requirement?
Build success does not prove connections, permissions, seed data and business workflows work together.
Reference data needs source control and repeatable seed logic, not manual one-off production inserts.
Policy-enforced reviews prevent bypassing designated security and database approvers.
Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.
A subscription report needs the previous month's revenue beside each current month
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
LAG retrieves a preceding row from a window without a self-join, respecting the defined partition and order.
DENSE_RANK retains equal ranks for ties while the next distinct value advances by one.
Jaro-Winkler style similarity rewards matching character patterns and helps with transpositions but cannot prove identity.
REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.
A database team wants to pass grounded prompt text to a trusted model HTTPS endpoint
Which SQL design or implementation decision most directly addresses this requirement?
The stored procedure can call an external REST endpoint under its security/configuration limits; the caller must handle HTTP errors and quotas.
LLMs are not authoritative for arithmetic or source-of-truth values; database computations should remain deterministic.
Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.
External network latency inside a transaction prolongs locks and increases deadlock and timeout exposure.
A deployment has dependent database schemas stored in separate repositories
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Project references inform build-time symbol resolution and make schema dependencies explicit.
Compilation catches many missing symbols and invalid references before a DACPAC is deployed.
Unit tests isolate programmable behavior and catch regression before full integration deployment.
Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.
A user asks for the meaning of a policy using wording not present in the source document
Which SQL design or implementation decision most directly addresses this requirement?
Vector similarity can match related meaning beyond exact token overlap if embedding quality is adequate.
Cosine, Euclidean and dot-product measures are not universally interchangeable unless normalization assumptions hold.
Vector normalization removes magnitude effects for certain comparisons but must match model guidance and the intended ranking metric.
Vector column dimension and element representation drive base storage and index footprint, not row count alone.
A data team uses RANGE RIGHT partitioning and is confused about which side owns the boundary value
Which SQL design or implementation decision most directly addresses this requirement?
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.
An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.
Avoiding functions on the indexed search column can let the optimizer use an index seek.
A developer computes distances between two SQL embedding columns but uses incompatible vector dimensions
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Distance calculation requires aligned dimensions and semantics, and metric choice affects ordering.
Repeated per-query transformation wastes compute when the model and representation are stable.
Index freshness includes removal as well as addition and edits; stale documents can yield harmful answers.
Late filtering after global top-K can leak unauthorized results or starve legitimate tenant matches.
A language model's HTTP response is JSON but a SQL procedure treats the entire response as final user text
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Model APIs return structured envelopes with status and content fields, which must not be forwarded blindly.
Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.
Source metadata supports provenance checks and keeps generated statements linked to authorized records.
RAG context can be missing or ambiguous; the model must not fill unsupported gaps with invented facts.
An AI workflow must send an order summary with predictable field names and types to a model
Which SQL design or implementation decision most directly addresses this requirement?
Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
Data minimization reduces privacy exposure, inference risk and token costs without impairing the specific answer.
Throttling and transient errors require carefully bounded retry; unbounded retries can exhaust database resources.
A SQL workload calls an AI model endpoint and code contains a static API key
Which SQL design or implementation decision most directly addresses this requirement?
Identity-based model calls reduce secret sprawl and allow endpoint permissions to be scoped and revoked.
Dynamic Data Masking changes query presentation for covered low-privilege principals but is not cryptographic encryption.
Auditing generates event evidence of SQL activity but must be configured for relevant actions and protected storage.
RLS predicates must receive authenticated tenant context and connection pooling can retain session state unless managed.
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