DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A container workload must authenticate to an Azure database without distributing shared SQL login secrets
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Managed identity supplies short-lived identity-based credentials without a long-lived application password.
Auditing generates event evidence of SQL activity but must be configured for relevant actions and protected storage.
Column-master and column-encryption key lifecycle must be managed carefully to prevent decryption outages.
Masking is a presentation control; filtering, permissions, and inference risks remain if users can query too freely.
A RAG index has adjacent snippets repeated many times without measurable recall gains
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.
A fixed-dimensional vector column cannot store embeddings of an incompatible dimension without schema or model changes.
A larger model is not automatically best; task complexity and throughput determine a suitable choice.
Chunk size and overlap trade off retrieval specificity and lost context; arbitrary whole-file chunks are often weak.
An application timeouts after a new SQL index is added and a DBA blames networking without measurements
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
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.
Blocking is caused by incompatible locks; addressing the head blocker is different from killing every waiting request.
Versioned read-committed isolation reduces reader/writer blocking but changes consistency semantics and tempdb/version-store demand.
A document search should include rows whose JSON array contains the approved attribute value
Which SQL design or implementation decision most directly addresses this requirement?
JSON membership testing asks whether a value is contained in the target JSON expression rather than extracting one scalar only.
Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.
Recursive CTEs need termination and data-integrity safeguards; a recursion cap is a protective limit, not a substitute for valid hierarchy rules.
Edit distance measures changes required to transform a string and must not be confused with semantic meaning.
A deployment adds a new reference row required by the application after schema changes
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Postdeployment scripts handle targeted data initialization but must avoid duplicate or destructive repeated effects.
Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.
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.
An organization chart must report every subordinate level beneath one manager
Which SQL design or implementation decision most directly addresses this requirement?
Recursive CTEs traverse hierarchies by repeatedly combining results until no new rows are produced.
LAG retrieves a preceding row from a window without a self-join, respecting the defined partition and order.
JSON_OBJECT produces correctly structured JSON property/value pairs and avoids manual quoting errors.
Errors can leave a transaction uncommittable; blindly committing from a catch block is unsafe.
A business process needs orchestration when SQL changes and several external SaaS actions are required
Which SQL design or implementation decision most directly addresses this requirement?
Logic Apps orchestrate heterogeneous connectors and retries more directly than embedding cross-service calls in a SQL trigger.
Distributed trace correlation helps associate API failures, dependency latency and service operations.
Application identity, API entity permissions and SQL authorization must jointly prevent overbroad access.
GraphQL relationships make defined SQL relations traversable through the API without arbitrary client SQL.
A database task performs several slow network operations inside BEGIN TRANSACTION
Which SQL design or implementation decision most directly addresses this requirement?
Long transactions hold locks and version state, worsening throughput and blocking.
CPU, concurrency and IO constraints drive sizing decisions; indiscriminate upgrades may not solve a poor plan.
Improving estimates, ordering or indexing can reduce tempdb spills and prevent large grants from crowding other queries.
SQL may abort one deadlock participant; retries can succeed but must not repeat non-idempotent side effects.
An optimizer change makes a critical query use a new plan with much higher IO
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Query Store retains plan and runtime history so regressions can be tied to specific plan choices.
SQL may abort one deadlock participant; retries can succeed but must not repeat non-idempotent side effects.
Serializable isolation protects range predicates from concurrent changes but may increase blocking and deadlocks.
The optimizer may scan without a suitable search path; index keys should reflect frequently filtered columns.
A database on Azure storage needs encryption at rest even if an underlying disk is stolen
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
TDE encrypts database files and backups at rest but does not prevent authorized SQL queries from reading plaintext.
Always Encrypted keeps sensitive column values inaccessible to parties lacking client-side keys, unlike server-only encryption at rest.
Separating audit custody from operational administrators reduces the risk of tampering and premature deletion.
Column-master and column-encryption key lifecycle must be managed carefully to prevent decryption outages.
A tax calculation accepts one order amount and returns one decimal rate-adjusted value
Which SQL design or implementation decision most directly addresses this requirement?
Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.
NOCOUNT suppresses DONEINPROC row-count chatter without changing @@ROWCOUNT semantics.
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.
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