DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
An OLTP table is queried through a date predicate but the column is wrapped in a conversion function
Which SQL design or implementation decision most directly addresses this requirement?
Avoiding functions on the indexed search column can let the optimizer use an index seek.
A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.
Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.
The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.
A customer query includes a mandatory date range in addition to semantic similarity
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Semantic relevance does not replace mandatory structured filters such as date, category or tenant.
Vector column dimension and element representation drive base storage and index footprint, not row count alone.
Repeated per-query transformation wastes compute when the model and representation are stable.
Cosine, Euclidean and dot-product measures are not universally interchangeable unless normalization assumptions hold.
A change compiles in the developer database but fails when deployed because an object reference is missing
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Compilation catches many missing symbols and invalid references before a DACPAC is deployed.
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.
A DACPAC packages the declarative database model used by supported deployment tools.
An assistant is issued a database credential with db_owner permission merely to inspect table shapes
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Least privilege reduces the impact of prompt injection, mistaken tool calls and credential disclosure.
Model choice affects capability and governance, and prompts must stay within the approved service boundary.
Secrets in repository configuration can be leaked or copied; managed credentials reduce exposure and support rotation.
Traceable AI-assisted operations support accountability while logs require access and retention controls.
A new inventory table needs a canonical identifier that other tables may reference
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.
Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.
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.
A schema project references tables from another project and treats those names as unresolved
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.
Schema rollback can be unsafe after new writes; recoverability must be designed before a high-risk change.
Schema drift is divergence between the target and the model; blind publish may remove legitimate hotfixes.
Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.
A developer adds raw BM25 scores to cosine similarity numbers without normalizing them
Which SQL design or implementation decision most directly addresses this requirement?
Raw keyword and vector scores may have different ranges and meanings, so naive addition can bias results.
Near-duplicate chunks can crowd top-K slots and lower answer coverage even with accurate vector ranking.
Answer-generation quality cannot reveal all retrieval failures; ranking metrics provide direct measurement.
Hybrid retrieval can leverage exact-term precision and vector semantic recall if results are merged sensibly.
A DAB endpoint receives identical requests and teams need controlled cache freshness
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Caching reduces repeat database load but introduces staleness and must avoid exposing user-specific sensitive results.
Search capability should use approved fields and query limits rather than exposing arbitrary free-form SQL.
At-least-once delivery and retries require idempotent consumers rather than relying on exactly-once invocation.
CDC records changes from the transaction log for downstream consumption, but latency and retention need management.
An existing legacy project uses nonstandard build files and tooling cannot discover SQL project dependencies
Which SQL design or implementation decision most directly addresses this requirement?
SDK-style project definitions simplify consistent tooling and package references while preserving project build semantics.
A consistent schema artifact should be promoted while environment-specific values are provided securely at deployment.
Backward-compatible intermediate schema lets mixed app versions operate safely until a later cleanup.
Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.
Regulators require tamper-evident evidence of changes to financial records
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Ledger adds cryptographic evidence for changes, but access governance and external digest retention remain essential.
Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.
Nullability is a core schema invariant and should not be delegated solely to an API form.
Uniqueness for non-primary business attributes is enforced separately from the surrogate primary key.
A managed endpoint is private but a broad service identity can invoke models not assigned to its project
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Network restrictions limit reachability while scoped credentials decide who can invoke supported operations.
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.
Overprivileged built-in roles broaden the blast radius of compromises and accidental statements.
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