DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A retrieved database description attempts to change the assistant's system instructions
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Prompt injection in tool output must not grant new authority or override the application trust boundary.
Model Context Protocol tools amplify backend permissions and should be least-privilege for AI workflows.
AI-tool access should follow user authorization and workspace boundaries rather than tool availability alone.
Secrets in repository configuration can be leaked or copied; managed credentials reduce exposure and support rotation.
A new inventory table needs a canonical identifier that other tables may reference
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
A primary key uniquely identifies each row and provides a reference target; its underlying index strategy is a separate design choice.
An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.
Avoiding functions on the indexed search column can let the optimizer use an index seek.
Approximate binary floating-point types cannot represent every decimal currency value exactly; fixed-precision decimal arithmetic avoids that category of rounding error.
A trigger works for one row but omits additional rows in a 200-row UPDATE
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
DML triggers run per statement and inserted/deleted can contain multiple rows; singleton assumptions cause data loss.
Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.
Procedure output parameters convey scalar results in addition to result sets and return status values.
DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.
Chunk overlap is set to almost the entire chunk size and storage/embedding costs spike
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Excess overlap duplicates tokens and vectors; insufficient overlap may split a needed answer across boundaries.
Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.
Model hosting and batch generation must align on dimensions, security boundaries and quotas.
Embedding quality varies by language and corpus; cross-lingual retrieval must be measured rather than assumed.
A global product-help index must find semantically similar phrases across several languages
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.
Different embedding models or versions need not share vector space; mixing vectors can destroy distance relevance.
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
A larger model is not automatically best; task complexity and throughput determine a suitable choice.
A payment posting operation must guarantee two related write operations succeed or fail together
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
An explicit transaction and consistent failure policy enforce atomicity across multiple statements.
Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.
Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.
Procedure output parameters convey scalar results in addition to result sets and return status values.
A deduplication engine must compare strings based on small insertion and deletion differences
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Edit distance measures changes required to transform a string and must not be confused with semantic meaning.
Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.
A nonrecursive CTE names a logical result within one statement and does not inherently materialize persistent storage.
DENSE_RANK retains equal ranks for ties while the next distinct value advances by one.
A fact table is queried mostly by month and has several years of history
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Partition elimination can narrow scans and partition switching can simplify retention when indexes align.
Uniqueness for non-primary business attributes is enforced separately from the surrogate primary key.
Referential constraints ensure stored relationships point to permitted parent keys and avoid orphan records.
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
A developer modifies a stored procedure and wants a focused test of its error branch
Which SQL design or implementation decision most directly addresses this requirement?
Unit tests isolate programmable behavior and catch regression before full integration deployment.
CI/CD credentials are high-value attack targets and should not be stored in repository text.
Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.
Schema rollback can be unsafe after new writes; recoverability must be designed before a high-risk change.
A service checks unprocessed work items and ignores the large processed-history portion
Which SQL design or implementation decision most directly addresses this requirement?
A predicate-limited index has fewer rows to maintain and can serve a matching selective WHERE clause.
Partition switching has schema and index-alignment prerequisites; an incompatible index can block the metadata operation.
The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.
External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.
An MCP endpoint can execute arbitrary SQL statements from a language-model-generated tool call
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Model-generated tool calls are untrusted and can misuse granted database permissions unless the tool boundary enforces policy.
RLS filter predicates address row visibility while block predicates can stop invalid INSERT/UPDATE operations.
RLS applies row filters in SQL based on security context, reducing reliance on each client remembering tenant WHERE clauses.
Masking is a presentation control; filtering, permissions, and inference risks remain if users can query too freely.
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