DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A status dashboard repeatedly filters on an indexed timestamp yet plans show scans
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.
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
Referential constraints ensure stored relationships point to permitted parent keys and avoid orphan records.
Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.
A solution stores high-dimensional vectors and the platform has strict capacity limits
Which SQL design or implementation decision most directly addresses this requirement?
Vector column dimension and element representation drive base storage and index footprint, not row count alone.
Full-text indexing supports token-oriented search and ranking beyond simple substring scans.
Index freshness includes removal as well as addition and edits; stale documents can yield harmful answers.
Vector properties help validate dimensions and related characteristics before comparison or indexing.
A prompt asks an external model to return SQL update statements and executes them without checking
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Model output is untrusted data and must not be treated as authorized executable SQL.
LLMs are not authoritative for arithmetic or source-of-truth values; database computations should remain deterministic.
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
Fluency is not a reliability metric; RAG performance depends on retrieval, prompt assembly and model behavior.
A new FK will fail unless existing orphan data is reconciled before publish
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.
Reference data needs source control and repeatable seed logic, not manual one-off production inserts.
Build success does not prove connections, permissions, seed data and business workflows work together.
Unmanaged production modifications can be overwritten unless intentionally captured in source control.
A Fabric developer cannot access Copilot suggestions even though the workspace contains SQL artifacts
Which SQL design or implementation decision most directly addresses this requirement?
Copilot features depend on administrative eligibility and workspace settings rather than appearing automatically for every user.
MCP endpoints are service interfaces requiring transport, authentication and authorization controls.
Natural-language prompts do not guarantee safe SQL, so explicit statement-level approval protects critical schema.
AI-generated rewrites can silently alter authorization or semantics even if syntactically valid.
A large historical transaction store supports mostly batch reporting rather than single-row updates
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Columnstore compression and batch execution are effective on broad aggregations; they are not universally best for singleton OLTP updates.
Unicode-capable character types retain characters outside a single legacy code page and require appropriate length planning.
Checking JSON validity before promotion reduces malformed documents but does not replace application-level schema validation.
System-versioned temporal tables maintain historical row versions so FOR SYSTEM_TIME queries can reconstruct earlier states.
A service performs repeated JSON_VALUE predicates and currently scans every row
Which SQL design or implementation decision most directly addresses this requirement?
An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.
Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.
A document description change should immediately queue an embedding update but OLTP writes must remain fast
Which SQL design or implementation decision most directly addresses this requirement?
Synchronous network calls in triggers extend transactions and risk blocking; queueing decouples compute.
Chunk size and overlap trade off retrieval specificity and lost context; arbitrary whole-file chunks are often weak.
Logic Apps coordinates cross-service actions and retries but does not eliminate the need for idempotency.
Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.
An AI service experiences intermittent timeouts and users see silent blank content
Which SQL design or implementation decision most directly addresses this requirement?
Throttling and transient errors require carefully bounded retry; unbounded retries can exhaust database resources.
Model output is untrusted data and must not be treated as authorized executable SQL.
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
The stored procedure can call an external REST endpoint under its security/configuration limits; the caller must handle HTTP errors and quotas.
A data team uses RANGE RIGHT partitioning and is confused about which side owns the boundary value
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.
Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.
Avoiding functions on the indexed search column can let the optimizer use an index seek.
An international knowledge base serves questions in Spanish, German and Japanese
Which SQL design or implementation decision most directly addresses this requirement?
Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.
Vector similarity does not enforce authorization; retrieval still needs tenant/ACL filters.
A larger model is not automatically best; task complexity and throughput determine a suitable choice.
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
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