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Microsoft DP-900 Practice Test 74

Question 730

An engineer asks who validates backward-compatible schema rollout and rollback. Select TWO statements that correctly describe the DBA schema migration oversight implementation and how it can be verified.

  1. Rename a table directly in production without checking callers.
  2. Choose suitable storage redundancy and separate restore or backup strategy where needed.
  3. Monitor database capacity connections health and alerts with response procedures.
  4. Both old and new clients work during the agreed transition period.
  5. Coordinate database schema changes with migrations backups and dependency testing.

Explanation

Correct Answers

D:

Both old and new clients work during the agreed transition period. This is directly observable success evidence for DBA schema migration oversight.

E:

Coordinate database schema changes with migrations backups and dependency testing. This is an appropriate action for the DBA schema migration oversight case. Database administrators plan safe structural changes to shared schemas.

Incorrect Answers

A:

Rename a table directly in production without checking callers. This is not a safe or appropriate DBA schema migration oversight implementation. Uncoordinated column removal can break dependent applications.

B:

Choose suitable storage redundancy and separate restore or backup strategy where needed. This implements Storage resiliency and replicas instead of the required DBA schema migration oversight function. Database administrators plan safe structural changes to shared schemas.

C:

Monitor database capacity connections health and alerts with response procedures. This implements DBA monitoring capacity and alerts instead of the required DBA schema migration oversight function. Database administrators plan safe structural changes to shared schemas.

Question 731

Architects propose Azure Table Storage for every file and SMB client. What is the MOST appropriate next validation or correction?

  1. Test object retrieval SMB mounting and key lookups separately.
  2. Call all three services SQL relational databases because they belong to Azure Storage.
  3. Rehearse selected failover scenario and measure client routing.
  4. Verify supported alignment and read-write range operations.

Explanation

Correct Answer

A:

Test object retrieval SMB mounting and key lookups separately. This tests the intended result: all three client patterns work under their expected APIs.

Incorrect Answers

B:

Call all three services SQL relational databases because they belong to Azure Storage. This unsafe shortcut leaves the Choosing Blob Files and Table for app needs problem unresolved. One universal interface assumption leads to unsupported operations.

C:

Rehearse selected failover scenario and measure client routing. It tests Cosmos DB multi-region distribution rather than the critical Choosing Blob Files and Table for app needs behavior. Azure Storage services expose distinct data models even within one storage account.

D:

Verify supported alignment and read-write range operations. It tests Page blob random access rather than the critical Choosing Blob Files and Table for app needs behavior. Azure Storage services expose distinct data models even within one storage account.

Question 732

A developer changes document fields and queries become expensive. What is the MOST appropriate next validation or correction?

  1. Test multi-edge routes and direction filters on sample graph.
  2. Assume every unbounded cross-partition query costs the same as an ID point read.
  3. Map selected redundancy to failure-domain and restore requirements.
  4. Compare query metrics and representative documents before tuning.

Explanation

Correct Answer

D:

Compare query metrics and representative documents before tuning. This tests the intended result: intended queries work with measurable RU use under representative data.

Incorrect Answers

A:

Test multi-edge routes and direction filters on sample graph. It tests Cosmos DB API for Apache Gremlin graph rather than the critical Cosmos DB NoSQL indexing and queries behavior. Indexed document properties support queries while policy affects write/read cost.

B:

Assume every unbounded cross-partition query costs the same as an ID point read. This unsafe shortcut leaves the Cosmos DB NoSQL indexing and queries problem unresolved. Excessive indexing or scans may inflate RU consumption.

C:

Map selected redundancy to failure-domain and restore requirements. It tests Azure Storage LRS ZRS GRS distinctions rather than the critical Cosmos DB NoSQL indexing and queries behavior. Indexed document properties support queries while policy affects write/read cost.

Question 733

A travel app must decide what happens if writes conflict across distributed sites. What is the MOST appropriate next validation or correction?

  1. Claim multi-region writes eliminates the possibility of write conflicts.
  2. Check method scope expiry and recipient handling with test requests.
  3. Validate CQL drivers and keyspace/partition query needs.
  4. Test concurrent conflicting writes from separated locations.

Explanation

Correct Answer

D:

Test concurrent conflicting writes from separated locations. This tests the intended result: conflicting updates follow the documented application semantics.

Incorrect Answers

A:

Claim multi-region writes eliminates the possibility of write conflicts. This unsafe shortcut leaves the Cosmos DB multi-region writes conflict handling problem unresolved. Assuming global writes automatically merge arbitrary business transactions may lose updates.

B:

Check method scope expiry and recipient handling with test requests. It tests Blob SAS delegated access rather than the critical Cosmos DB multi-region writes conflict handling behavior. Multiple write regions add concurrency and conflict resolution concerns.

C:

Validate CQL drivers and keyspace/partition query needs. It tests Cosmos DB API for Apache Cassandra rather than the critical Cosmos DB multi-region writes conflict handling behavior. Multiple write regions add concurrency and conflict resolution concerns.

Question 734

A store needs every category listed with optional product counts. What is the MOST appropriate next validation or correction?

  1. Put the optional table on the left and assume the original parent set is still fully kept.
  2. Attempt valid invalid and null inserts with test transactions.
  3. Compare driver schema and stored routine compatibility before migration.
  4. Test a known customer with zero orders in output.

Explanation

Correct Answer

D:

Test a known customer with zero orders in output. This tests the intended result: customers without orders remain visible with null child values.

Incorrect Answers

A:

Put the optional table on the left and assume the original parent set is still fully kept. This unsafe shortcut leaves the Left outer join preserving parents problem unresolved. Using an inner join can hide zero-activity customers.

B:

Attempt valid invalid and null inserts with test transactions. It tests Relational constraint CHECK and NOT NULL rather than the critical Left outer join preserving parents behavior. A left outer join keeps all left-side rows even without right-side matches.

C:

Compare driver schema and stored routine compatibility before migration. It tests Azure Database for MySQL Flexible Server rather than the critical Left outer join preserving parents behavior. A left outer join keeps all left-side rows even without right-side matches.

Question 735

A processing service restarts while many events are buffered. If the relevant Streaming checkpoints and replay safeguard is skipped, which failure is MOST directly associated with that omission?

  1. Treating overlapping counts as disjoint totals can double-count dashboard sums.
  2. Advancing offsets before successful sink commit can lose events.
  3. Picking a SQL-first store for raw notebook-only work may cause extra conversions.
  4. Mistaking Copy Activity for an always-on SQL database can misdesign access.

Explanation

Correct Answer

B:

Advancing offsets before successful sink commit can lose events. Checkpointing records stream progress; retries may still deliver records more than once. A suitable check is to kill a test consumer and reconcile events after restart.

Incorrect Answers

A:

Treating overlapping counts as disjoint totals can double-count dashboard sums. This failure is associated with Hopping sliding analytic windows; it is not the primary failure in the stated Streaming checkpoints and replay scenario. Checkpointing records stream progress; retries may still deliver records more than once.

C:

Picking a SQL-first store for raw notebook-only work may cause extra conversions. This failure is associated with Lakehouse versus Warehouse selection; it is not the primary failure in the stated Streaming checkpoints and replay scenario. Checkpointing records stream progress; retries may still deliver records more than once.

D:

Mistaking Copy Activity for an always-on SQL database can misdesign access. This failure is associated with Azure Data Factory Copy Activity; it is not the primary failure in the stated Streaming checkpoints and replay scenario. Checkpointing records stream progress; retries may still deliver records more than once.

Question 736

A retailer needs every customer row to have a predictable CustomerID and email column. Which choice BEST meets this requirement?

  1. Maintain metadata fields or indexes alongside immutable media object content.
  2. Rename a spreadsheet header and assume all values now meet the database data type.
  3. Implement schema validation evolution and compatibility checks in ingestion.
  4. Use typed relational columns with defined constraints for consistently shaped entities.

Explanation

Correct Answer

D:

Structured data follows an explicit schema that makes consistent queries and validation practical.

Incorrect Answers

A:

Maintain metadata fields or indexes alongside immutable media object content. That action primarily handles Binary object metadata separation; the given requirement is Structured records in a customer table. Structured data follows an explicit schema that makes consistent queries and validation practical.

B:

Rename a spreadsheet header and assume all values now meet the database data type. It does not implement Structured records in a customer table. Treating a typed column as arbitrary free text undermines comparison and validation.

C:

Implement schema validation evolution and compatibility checks in ingestion. That action primarily handles Data engineer schema and format changes; the given requirement is Structured records in a customer table. Structured data follows an explicit schema that makes consistent queries and validation practical.

Question 737

Analysts need a workflow when a real-time condition persists. What is the MOST appropriate next validation or correction?

  1. Verify discoverability and access for distinct Fabric users.
  2. Test hierarchy navigation and chronological sorting.
  3. Name a dashboard Alert and assume it sends notifications without an Activator rule.
  4. Test both triggering and non-triggering input streams.

Explanation

Correct Answer

D:

Test both triggering and non-triggering input streams. This tests the intended result: the configured alert fires only for matching test conditions.

Incorrect Answers

A:

Verify discoverability and access for distinct Fabric users. It tests Fabric Real-Time hub stream discovery rather than the critical Fabric Activator rule-triggered action behavior. Activator turns detected data conditions into governed actions.

B:

Test hierarchy navigation and chronological sorting. It tests Drill-down hierarchy for time rather than the critical Fabric Activator rule-triggered action behavior. Activator turns detected data conditions into governed actions.

C:

Name a dashboard Alert and assume it sends notifications without an Activator rule. This unsafe shortcut leaves the Fabric Activator rule-triggered action problem unresolved. Without a rule/action connection monitoring does not imply automatic response.

Question 738

A clinic must store diagnostic photographs without assuming pixels are relational columns. If the relevant Unstructured image binary files safeguard is skipped, which failure is MOST directly associated with that omission?

  1. Flattening a nested field without tracking its parent can mix unrelated records.
  2. Treating correlation as proof of a cause can mislead decisions.
  3. Putting raw binary into text-only analytic columns frustrates content searches and storage.
  4. Assuming cloud-managed storage always eliminates backup planning risks unrecoverable mistakes.

Explanation

Correct Answer

C:

Putting raw binary into text-only analytic columns frustrates content searches and storage. Unstructured images lack a predefined row-column model even when their metadata is structured. A suitable check is to check object retrieval and metadata-to-image identity for sampled records.

Incorrect Answers

A:

Flattening a nested field without tracking its parent can mix unrelated records. This failure is associated with JSON arrays and nested objects; it is not the primary failure in the stated Unstructured image binary files scenario. Unstructured images lack a predefined row-column model even when their metadata is structured.

B:

Treating correlation as proof of a cause can mislead decisions. This failure is associated with Data analyst anomaly interpretation; it is not the primary failure in the stated Unstructured image binary files scenario. Unstructured images lack a predefined row-column model even when their metadata is structured.

D:

Assuming cloud-managed storage always eliminates backup planning risks unrecoverable mistakes. This failure is associated with DBA backup and recovery responsibility; it is not the primary failure in the stated Unstructured image binary files scenario. Unstructured images lack a predefined row-column model even when their metadata is structured.

Question 739

A media company serves recent photos frequently but retains older backups rarely. If the relevant Hot cool cold and archive blob tiers safeguard is skipped, which failure is MOST directly associated with that omission?

  1. Moving frequently accessed objects to archive can disrupt low-latency requests.
  2. Ignoring checkpoints may duplicate downstream actions on retries.
  3. Treating virtual folder name prefixes as identical to hierarchical directory ACLs can fail.
  4. Treating every query as equal-cost can overload provisioned throughput.

Explanation

Correct Answer

A:

Moving frequently accessed objects to archive can disrupt low-latency requests. Access tiers differ in online availability and access cost, not just storage price. A suitable check is to measure request frequency and archive rehydration implications.

Incorrect Answers

B:

Ignoring checkpoints may duplicate downstream actions on retries. This failure is associated with Cosmos DB change feed updates; it is not the primary failure in the stated Hot cool cold and archive blob tiers scenario. Access tiers differ in online availability and access cost, not just storage price.

C:

This failure is associated with ADLS Gen2 hierarchical namespace; it is not the primary failure in the stated Hot cool cold and archive blob tiers scenario.

D:

Treating every query as equal-cost can overload provisioned throughput. This failure is associated with Cosmos DB Request Unit RU accounting; it is not the primary failure in the stated Hot cool cold and archive blob tiers scenario. Access tiers differ in online availability and access cost, not just storage price.

Question 740

Clickstream consumers process many users in parallel. Which choice BEST meets this requirement?

  1. Use Power Query transformations with explicit type conversion and reusable steps.
  2. Apply hopping windows with defined window size and hop interval.
  3. Partition events by suitable key and document ordering constraints.
  4. Assume adding partitions creates a single globally ordered transaction log.

Explanation

Correct Answer

C:

Partitioned streaming distributes throughput but global ordering is not guaranteed.

Incorrect Answers

A:

Use Power Query transformations with explicit type conversion and reusable steps. That action primarily handles Power Query shaping transformation; the given requirement is Event streams partitioning and key order. Partitioned streaming distributes throughput but global ordering is not guaranteed.

B:

Apply hopping windows with defined window size and hop interval. That action primarily handles Hopping sliding analytic windows; the given requirement is Event streams partitioning and key order. Partitioned streaming distributes throughput but global ordering is not guaranteed.

D:

Assume adding partitions creates a single globally ordered transaction log. It does not implement Event streams partitioning and key order. Assuming order across unrelated partitions can corrupt sequence reconstruction.

Microsoft Azure Data Fundamentals (DP-900) Practice Tests