DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
An auditing trigger causes nested execution loops when writes to the audit table invoke another trigger
Which SQL design or implementation decision most directly addresses this requirement?
Uncontrolled trigger nesting can cause excess DML, recursion failures, and transactional contention.
Views and TVFs are relational query sources; stored procedures are invoked with EXEC and do not act as arbitrary table expressions.
T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.
Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.
A legacy reporting view intercepts a write and needs to redirect it to normalized underlying tables
Which SQL design or implementation decision most directly addresses this requirement?
INSTEAD OF triggers replace the original DML action and must implement the full intended persistence behavior.
Views centralize a logical query definition without storing an independent copy of rows by default.
TVPs provide typed relational input for multirow procedure operations without ad hoc concatenated SQL.
DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.
Two developers edit the same SQL procedure and direct pushes overwrite each other's changes
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.
Policy-enforced reviews prevent bypassing designated security and database approvers.
Schema rollback can be unsafe after new writes; recoverability must be designed before a high-risk change.
Compilation catches many missing symbols and invalid references before a DACPAC is deployed.
Database audit records are kept in the same writable store as the application administrator's data
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Separating audit custody from operational administrators reduces the risk of tampering and premature deletion.
Randomized encryption gives stronger pattern protection at the cost of limiting server-side comparisons.
Deterministic encryption enables equality comparisons for matching plaintexts but reveals equality patterns and is less private than randomized encryption.
Object-level permissions enable task-specific capability without broad exposure to every table.
An UPDATE query scans a large table to find few rows and blocks other writers
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Efficient row identification can shorten lock holding; excess indexes can slow writes and require balanced tuning.
Statistics provide distribution estimates that influence cardinality and join strategy choices.
Versioned read-committed isolation reduces reader/writer blocking but changes consistency semantics and tempdb/version-store demand.
Long transactions hold locks and version state, worsening throughput and blocking.
JSON events contain a scalar priority at path $.incident.severity
Which SQL design or implementation decision most directly addresses this requirement?
JSON_VALUE reads scalar values at a specified JSON path; non-scalar fragments need a different interface.
JSON_OBJECT produces correctly structured JSON property/value pairs and avoids manual quoting errors.
Jaro-Winkler style similarity rewards matching character patterns and helps with transpositions but cannot prove identity.
A ROWS frame specifies exactly which neighboring rows contribute, whereas default RANGE behavior may include peer rows.
A data-access function has several staged relational transformations and needs a table return
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.
T-SQL user-defined functions have side-effect and statement restrictions that differ from stored procedures.
An explicit transaction and consistent failure policy enforce atomicity across multiple statements.
Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.
A frontend wants to traverse an approved parent-child relationship using a typed GraphQL field
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
GraphQL relationships make defined SQL relations traversable through the API without arbitrary client SQL.
API filtering reduces unnecessary result transfer but cannot replace server-side authorization.
DAB can expose approved programmable objects while caller identity and database permissions enforce access.
CES can publish database changes into an event architecture, but supported platform and ordering guarantees must be checked.
An event history must identify the next stage after each transaction in the same customer stream
Which SQL design or implementation decision most directly addresses this requirement?
LEAD returns a later row in an ordered window and avoids complicated self-joins.
Window numbering can select one row per logical partition while a deterministic secondary sort resolves equal timestamps.
REGEXP_SUBSTR returns a matched substring while a boolean regex predicate only indicates match existence.
Edit distance measures changes required to transform a string and must not be confused with semantic meaning.
A team wants to query external data without continuously copying it into an operational table
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
External tables expose remote data through SQL metadata, but performance, supported formats and security depend on the source.
Partition elimination can narrow scans and partition switching can simplify retention when indexes align.
Covering indexes can avoid residual lookups while keeping included attributes out of the search-key ordering.
The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.
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.
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