DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
An accounting service must let auditors detect unauthorized alteration of retained ledger data
Which SQL design or implementation decision most directly addresses this requirement?
Ledger adds cryptographic evidence for changes, but access governance and external digest retention remain essential.
Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.
Database check predicates reject invalid stored values regardless of which client sent the write.
External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.
An event export groups individual values into a single structured JSON array per account
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
JSON_ARRAYAGG aggregates scalar or JSON values into an array, reducing custom string assembly.
REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.
THROW provides structured error propagation that callers can handle and prevents false-success status reporting.
Errors can leave a transaction uncommittable; blindly committing from a catch block is unsafe.
An inventory record has a constrained integer state code that should never be outside its approved range
Which SQL design or implementation decision most directly addresses this requirement?
Database check predicates reject invalid stored values regardless of which client sent the write.
System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.
Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.
Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.
A deployment introduces a slower plan for the same SQL text and users report a latency spike
Which SQL design or implementation decision most directly addresses this requirement?
Query Store retains plan and runtime history so regressions can be tied to specific plan choices.
Actual plans reveal runtime statistics and costly operators that estimated plans alone may not expose.
Long transactions hold locks and version state, worsening throughput and blocking.
Latency symptoms may come from blocking, execution plans, throttling or network; one symptom cannot establish root cause.
A model endpoint is moved and ingestion errors expose long-lived tokens in application logs
Which SQL design or implementation decision most directly addresses this requirement?
Operational logs can reveal sensitive source text or access tokens if not carefully configured.
High-entropy IDs and timestamps add noise to natural-language embeddings; structured filters handle them better.
Structured-output mode can reduce free-form variability but application-side validation remains required.
Synchronous network calls in triggers extend transactions and risk blocking; queueing decouples compute.
An assistant times out because the retrieval step sends all candidate documents to the model
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Excess context raises cost, latency and distraction; selective retrieval improves the model's usable evidence.
Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.
Throttling and transient errors require carefully bounded retry; unbounded retries can exhaust database resources.
External network latency inside a transaction prolongs locks and increases deadlock and timeout exposure.
A department needs SQL-level encryption for a single stored field while accepting managed key exposure to the engine
Which SQL design or implementation decision most directly addresses this requirement?
Server-side column encryption is different from Always Encrypted: the engine may decrypt for authorized server operations.
Overprivileged built-in roles broaden the blast radius of compromises and accidental statements.
TDE encrypts database files and backups at rest but does not prevent authorized SQL queries from reading plaintext.
Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.
A developer modifies a stored procedure and wants a focused test of its error branch
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Unit tests isolate programmable behavior and catch regression before full integration deployment.
A DACPAC packages the declarative database model used by supported deployment tools.
Project references inform build-time symbol resolution and make schema dependencies explicit.
Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.
A finance team requests more computations on Always Encrypted columns than ordinary client-side encryption supports
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Secure enclaves can permit certain richer operations over encrypted data within an attested protected boundary.
TLS protects data in transit and endpoint verification reduces man-in-the-middle risk.
RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.
Identity-based model calls reduce secret sprawl and allow endpoint permissions to be scoped and revoked.
A billing service must preserve exact two-decimal charges in SQL Server
Which SQL design or implementation decision most directly addresses this requirement?
Approximate binary floating-point types cannot represent every decimal currency value exactly; fixed-precision decimal arithmetic avoids that category of rounding error.
The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.
Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.
System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.
A user requests account details and model context retrieval does not apply database row-level security
Which SQL design or implementation decision most directly addresses this requirement?
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
Throttling and transient errors require carefully bounded retry; unbounded retries can exhaust database resources.
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.
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