DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
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.
A RAG workflow returns a source link but that source belongs to another tenant
Which SQL design or implementation decision most directly addresses this requirement?
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.
LLMs are not authoritative for arithmetic or source-of-truth values; database computations should remain deterministic.
Excess context raises cost, latency and distraction; selective retrieval improves the model's usable evidence.
An analytics query requires one row for each order with a related count of matching line items
Which SQL design or implementation decision most directly addresses this requirement?
A correlated subquery evaluates using the current outer-row key and may be optimized differently from explicit joins.
Window aggregates retain detail rows while computing group-level results, unlike GROUP BY which collapses rows.
REGEXP_COUNT returns the number of matches, unlike a boolean REGEXP_LIKE or substring extraction.
APPLY evaluates a right-side table expression per outer row and OUTER APPLY retains parents with no matches.
A database schema publish unexpectedly includes a DROP for a populated legacy table
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Automated schema comparisons may propose destructive changes that need explicit approval and migration planning.
CI/CD credentials are high-value attack targets and should not be stored in repository text.
CI can build frequently while CD must respect protected environments, approvals and test conditions.
SQL Database Projects represent schema as versioned declarative artifacts that can be built and validated.
A query must combine a local reference table with a dataset kept in an external platform
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.
Nullability is a core schema invariant and should not be delegated solely to an API form.
System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.
In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.
A company automates text synthesis from SQL query results and sends prompts through a model deployed in a different trust region
Which SQL design or implementation decision most directly addresses this requirement?
Cross-boundary model processing can violate residency or contractual restrictions even when SQL itself is secured.
Data minimization reduces privacy exposure, inference risk and token costs without impairing the specific answer.
RAG context can be missing or ambiguous; the model must not fill unsupported gaps with invented facts.
Structured JSON preserves named fields and reduces ambiguity compared with ad hoc delimited text.
A customer table must never contain two rows with the same immutable customer identifier
Which SQL design or implementation decision most directly addresses this requirement?
A primary key uniquely identifies each row and provides a reference target; its underlying index strategy is a separate design choice.
Partition elimination can narrow scans and partition switching can simplify retention when indexes align.
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
Partition switching has schema and index-alignment prerequisites; an incompatible index can block the metadata operation.
An API connects to a database through a plaintext channel on a network with untrusted intermediaries
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
TLS protects data in transit and endpoint verification reduces man-in-the-middle risk.
RLS filter predicates address row visibility while block predicates can stop invalid INSERT/UPDATE operations.
Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.
Masking is a presentation control; filtering, permissions, and inference risks remain if users can query too freely.
A service fleet needs centralized account revocation and identity-based database access
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Centralized identity management reduces shared-secret exposure and improves attribution and revocation.
Deterministic encryption enables equality comparisons for matching plaintexts but reveals equality patterns and is less private than randomized encryption.
Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.
Server-side column encryption is different from Always Encrypted: the engine may decrypt for authorized server operations.
A team stores source text without chunk IDs and cannot trace semantic hits back to the original document
Which SQL design or implementation decision most directly addresses this requirement?
Provenance identifiers are needed for source citation, authorization and update/delete handling.
Raw keyword and vector scores may have different ranges and meanings, so naive addition can bias results.
Late filtering after global top-K can leak unauthorized results or starve legitimate tenant matches.
Vector normalization removes magnitude effects for certain comparisons but must match model guidance and the intended ranking metric.
A fraud system stores entities and many-to-many relationships that analysts traverse with patterns
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.
Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.
Checking JSON validity before promotion reduces malformed documents but does not replace application-level schema validation.
In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.
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