DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
Two branches change the same table definition and the merged project has conflicting constraints
Which SQL design or implementation decision most directly addresses this requirement?
Text merges may not produce semantically compatible database designs, requiring explicit conflict resolution.
Unmanaged production modifications can be overwritten unless intentionally captured in source control.
Reference data needs source control and repeatable seed logic, not manual one-off production inserts.
Backward-compatible intermediate schema lets mixed app versions operate safely until a later cleanup.
An automated workflow must catch invalid SQL object dependencies before staging
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.
Unit tests isolate programmable behavior and catch regression before full integration deployment.
Project references inform build-time symbol resolution and make schema dependencies explicit.
CI/CD credentials are high-value attack targets and should not be stored in repository text.
A batch payload contains nested key-value elements that must be joined to a dimension table
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
OPENJSON shreds objects or arrays into rows and typed columns when a schema is supplied.
Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.
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.
A RAG feature includes twenty irrelevant SQL rows and its prompts exceed the endpoint's context budget
Which SQL design or implementation decision most directly addresses this requirement?
Excess context raises cost, latency and distraction; selective retrieval improves the model's usable evidence.
External network latency inside a transaction prolongs locks and increases deadlock and timeout exposure.
Retrieval-augmented prompts must not bypass database access controls through backend service identity.
RAG context can be missing or ambiguous; the model must not fill unsupported gaps with invented facts.
A service needs cosine similarity but input vectors have inconsistent magnitudes
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Vector normalization removes magnitude effects for certain comparisons but must match model guidance and the intended ranking metric.
Provenance identifiers are needed for source citation, authorization and update/delete handling.
Exhaustive nearest-neighbor comparison checks all eligible vectors and provides a recall reference for ANN.
Semantic relevance does not replace mandatory structured filters such as date, category or tenant.
An embedding job must run when a record changes and should scale without patching worker VMs
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
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.
Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.
A service-account design relies on a stored procedure to perform constrained data changes
Which SQL design or implementation decision most directly addresses this requirement?
Stored procedure execution can reduce direct table grants but still needs review of ownership, dynamic SQL, and execution context.
DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.
Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.
Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.
An application timeouts after a new SQL index is added and a DBA blames networking without measurements
Which SQL design or implementation decision most directly addresses this requirement?
Latency symptoms may come from blocking, execution plans, throttling or network; one symptom cannot establish root cause.
SQL may abort one deadlock participant; retries can succeed but must not repeat non-idempotent side effects.
The optimizer may scan without a suitable search path; index keys should reflect frequently filtered columns.
Actual plans reveal runtime statistics and costly operators that estimated plans alone may not expose.
A legacy TVF inserts into a table variable and has a poorly estimated cardinality
Which SQL design or implementation decision most directly addresses this requirement?
Multistatement TVFs can introduce estimation and optimization limitations, so an inline form is preferred when expressive enough.
Views and TVFs are relational query sources; stored procedures are invoked with EXEC and do not act as arbitrary table expressions.
DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.
Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.
A large table changes distribution drastically after a batch load and query plans regress
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Statistics provide distribution estimates that influence cardinality and join strategy choices.
Snapshot transactions read a consistent row version as of transaction start without dirty reads, but writes may conflict.
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.
A pipeline successfully builds the schema project but application migrations break with the real API
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Build success does not prove connections, permissions, seed data and business workflows work together.
Schema drift is divergence between the target and the model; blind publish may remove legitimate hotfixes.
Text merges may not produce semantically compatible database designs, requiring explicit conflict resolution.
Project references inform build-time symbol resolution and make schema dependencies explicit.
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