DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
An MCP endpoint can execute arbitrary SQL statements from a language-model-generated tool call
Which SQL design or implementation decision most directly addresses this requirement?
Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.
Identity-based model calls reduce secret sprawl and allow endpoint permissions to be scoped and revoked.
Column-master and column-encryption key lifecycle must be managed carefully to prevent decryption outages.
Nonproduction environments should not inherit production exposure merely for test convenience.
An integration must obtain an identifier before inserting its final target row
Which SQL design or implementation decision most directly addresses this requirement?
Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.
Partition switching has schema and index-alignment prerequisites; an incompatible index can block the metadata operation.
Avoiding functions on the indexed search column can let the optimizer use an index seek.
Checking JSON validity before promotion reduces malformed documents but does not replace application-level schema validation.
A DAB configuration works locally but production requests fail because the host has no proper connection configuration
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Configuration separation allows consistent entities while credentials and endpoints differ securely across environments.
SQL trigger bindings react to detected table changes and require correct change tracking and idempotent handler logic.
Pagination bounds response size and limits database work per request, while stable ordering is essential.
DAB can expose approved programmable objects while caller identity and database permissions enforce access.
An external model is upgraded and its embeddings are not compatible with existing stored vectors
Which SQL design or implementation decision most directly addresses this requirement?
Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.
Structured-output mode can reduce free-form variability but application-side validation remains required.
Change Tracking identifies changed rows efficiently but does not preserve full change history or unlimited retention.
A fixed-dimensional vector column cannot store embeddings of an incompatible dimension without schema or model changes.
A production index was added manually during an incident and the next CI/CD release proposes dropping it
Which SQL design or implementation decision most directly addresses this requirement?
Unmanaged production modifications can be overwritten unless intentionally captured in source control.
Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.
Decoupling build and deploy improves traceability and avoids publishing unreviewed source.
Build success does not prove connections, permissions, seed data and business workflows work together.
A security application needs to identify multi-hop links between accounts and devices
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.
In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.
Covering indexes can avoid residual lookups while keeping included attributes out of the search-key ordering.
Nullability is a core schema invariant and should not be delegated solely to an API form.
A semantic-search index returns irrelevant matches because it embeds volatile IDs instead of meaningful language
Which SQL design or implementation decision most directly addresses this requirement?
High-entropy IDs and timestamps add noise to natural-language embeddings; structured filters handle them better.
Model hosting and batch generation must align on dimensions, security boundaries and quotas.
Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.
Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.
A file naming convention encodes a region token inside a longer value
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.
Regex splitting can turn patterned text delimiters into row values for relational processing.
Errors can leave a transaction uncommittable; blindly committing from a catch block is unsafe.
REGEXP_COUNT returns the number of matches, unlike a boolean REGEXP_LIKE or substring extraction.
A model evaluation needs a ground-truth top-K neighbor list for vector search quality testing
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Exhaustive nearest-neighbor comparison checks all eligible vectors and provides a recall reference for ANN.
SQL vector storage enforces or expects a known dimension and model compatibility for meaningful distance calculations.
Full-text indexing supports token-oriented search and ranking beyond simple substring scans.
Distance calculation requires aligned dimensions and semantics, and metric choice affects ordering.
A dashboard must compute a per-account child aggregation without a global group-by rewrite
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
A correlated subquery evaluates using the current outer-row key and may be optimized differently from explicit joins.
Correlated EXISTS performs an existence test and avoids multiplying outer rows for multiple qualifying matches.
OPENJSON shreds objects or arrays into rows and typed columns when a schema is supplied.
Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.
A team needs controlled model endpoint definitions reusable across approved SQL workflows
Which SQL design or implementation decision most directly addresses this requirement?
A governed model object can centralize endpoint and identity parameters for supported SQL AI operations.
High-entropy IDs and timestamps add noise to natural-language embeddings; structured filters handle them better.
Embedding freshness requires detecting source changes and re-embedding only changed meaningful content.
A fixed-dimensional vector column cannot store embeddings of an incompatible dimension without schema or model changes.
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