Microsoft DP-900 Practice Test 85
Question 840
A data team wants to retain raw source snapshots before producing tables. Select TWO statements that correctly describe the ELT warehouse pushdown transforms implementation and how it can be verified.
- Ingest raw data then perform controlled ELT transformations within target compute.
- Model a central fact table and suitable date customer and product dimensions.
- Curated tables can be rebuilt from retained raw inputs.
- Store appropriate analytical data in Parquet columnar files.
- Assume ELT means no transformations are needed.
Explanation
Correct Answers
A:Ingest raw data then perform controlled ELT transformations within target compute. This is an appropriate action for the ELT warehouse pushdown transforms case. ELT loads before transformation and uses destination processing resources.
C:Curated tables can be rebuilt from retained raw inputs. This is directly observable success evidence for ELT warehouse pushdown transforms.
Incorrect Answers
B:Model a central fact table and suitable date customer and product dimensions. This implements Star schema report model instead of the required ELT warehouse pushdown transforms function. ELT loads before transformation and uses destination processing resources.
D:Store appropriate analytical data in Parquet columnar files. This implements Parquet compressed columnar analytics instead of the required ELT warehouse pushdown transforms function. ELT loads before transformation and uses destination processing resources.
E:Assume ELT means no transformations are needed. This is not a safe or appropriate ELT warehouse pushdown transforms implementation. Dropping raw inputs before validating transforms harms reproducibility.
Question 841
A wide-column application uses Cassandra Query Language. If the relevant Cosmos DB API for Apache Cassandra safeguard is skipped, which failure is MOST directly associated with that omission?
- One universal interface assumption leads to unsupported operations.
- Flattening graph traversal into independent key point reads may be awkward.
- Expecting a SQL Server JDBC schema for every CQL feature breaks migration.
- Locking an incorrect period can create costly irreversible obligations.
Explanation
Correct Answer
C:Expecting a SQL Server JDBC schema for every CQL feature breaks migration. Cassandra API exposes a compatible wide-column model distinct from document NoSQL. A suitable check is to validate CQL drivers and keyspace/partition query needs.
Incorrect Answers
A:One universal interface assumption leads to unsupported operations. This failure is associated with Choosing Blob Files and Table for app needs; it is not the primary failure in the stated Cosmos DB API for Apache Cassandra scenario. Cassandra API exposes a compatible wide-column model distinct from document NoSQL.
B:Flattening graph traversal into independent key point reads may be awkward. This failure is associated with Cosmos DB API for Apache Gremlin graph; it is not the primary failure in the stated Cosmos DB API for Apache Cassandra scenario. Cassandra API exposes a compatible wide-column model distinct from document NoSQL.
D:Locking an incorrect period can create costly irreversible obligations. This failure is associated with Immutable blob retention and legal hold; it is not the primary failure in the stated Cosmos DB API for Apache Cassandra scenario. Cassandra API exposes a compatible wide-column model distinct from document NoSQL.
Question 842
A video platform needs inexpensive access to uploaded videos by object key. After selecting the proper Azure Blob Storage for object data approach, which observation gives the clearest evidence of success?
- Existing MySQL queries and connections work with a managed service.
- Content is retrieved by object name using approved credentials or signed access.
- Old reports preserve historical attributes while operational records show current values.
- Barcodes retain exact leading zeros while quantities aggregate correctly.
Explanation
Correct Answer
B:Content is retrieved by object name using approved credentials or signed access. This is the directly observable result for Azure Blob Storage for object data; blob is object storage rather than a shared SMB file system.
Incorrect Answers
A:Existing MySQL queries and connections work with a managed service. This supports Azure MySQL versus PostgreSQL service-model selection, not confirmation of Azure Blob Storage for object data. The relevant evidence is that content is retrieved by object name using approved credentials or signed access.
C:Old reports preserve historical attributes while operational records show current values. This supports Historical dimensions versus current operational truth, not confirmation of Azure Blob Storage for object data. The relevant evidence is that content is retrieved by object name using approved credentials or signed access.
D:Barcodes retain exact leading zeros while quantities aggregate correctly. This supports Data types in tabular files, not confirmation of Azure Blob Storage for object data. The relevant evidence is that content is retrieved by object name using approved credentials or signed access.
Question 843
A user accidentally deletes valid invoice rows two hours ago. If the relevant Azure SQL Database backup PITR safeguard is skipped, which failure is MOST directly associated with that omission?
- Copying the customer name into every order risks inconsistent updates.
- Assuming automatic backups undo every external action can hide data gaps.
- Treating PostgreSQL as SQL Server may break functions and drivers.
- Missing relationships may disappear from inner-join results.
Explanation
Correct Answer
B:Assuming automatic backups undo every external action can hide data gaps. Managed database backups support restore windows but still require planning and testing. A suitable check is to run an isolated restore and reconcile target time and transactions.
Incorrect Answers
A:Copying the customer name into every order risks inconsistent updates. This failure is associated with One to many customer order relationship; it is not the primary failure in the stated Azure SQL Database backup PITR scenario. Managed database backups support restore windows but still require planning and testing.
C:Treating PostgreSQL as SQL Server may break functions and drivers. This failure is associated with Azure Database for PostgreSQL Flexible Server; it is not the primary failure in the stated Azure SQL Database backup PITR scenario. Managed database backups support restore windows but still require planning and testing.
D:Missing relationships may disappear from inner-join results. This failure is associated with Inner join row matching; it is not the primary failure in the stated Azure SQL Database backup PITR scenario. Managed database backups support restore windows but still require planning and testing.
Question 844
Users update the same document from separate regions at once. If the relevant Cosmos DB multi-region writes conflict handling safeguard is skipped, which failure is MOST directly associated with that omission?
- Only replicating the latest share state may not recover accidental overwrites.
- Treating container names as database tables with SQL joins causes unsupported queries.
- One hot key can throttle even when account capacity is increased.
- Assuming global writes automatically merge arbitrary business transactions may lose updates.
Explanation
Correct Answer
D:Assuming global writes automatically merge arbitrary business transactions may lose updates. Multiple write regions add concurrency and conflict resolution concerns. A suitable check is to test concurrent conflicting writes from separated locations.
Incorrect Answers
A:Only replicating the latest share state may not recover accidental overwrites. This failure is associated with Azure Files snapshots and backups; it is not the primary failure in the stated Cosmos DB multi-region writes conflict handling scenario. Multiple write regions add concurrency and conflict resolution concerns.
B:Treating container names as database tables with SQL joins causes unsupported queries. This failure is associated with Blob storage object and container hierarchy; it is not the primary failure in the stated Cosmos DB multi-region writes conflict handling scenario. Multiple write regions add concurrency and conflict resolution concerns.
C:One hot key can throttle even when account capacity is increased. This failure is associated with Cosmos DB logical partition key; it is not the primary failure in the stated Cosmos DB multi-region writes conflict handling scenario. Multiple write regions add concurrency and conflict resolution concerns.
Question 845
A manufacturer needs to collect equipment measurements from several incompatible source systems. Which principle BEST explains the correct Analytical ingestion from operational systems design decision?
- Fabric Warehouse provides a SQL-oriented analytics experience in Fabric.
- Analytical ingestion moves and organizes data from operational sources for subsequent processing.
- Slicers provide user-driven data filtering rather than changing source rows.
- Reports and dashboards have different presentation and interaction roles.
Explanation
Correct Answer
B:Analytical ingestion moves and organizes data from operational sources for subsequent processing. In this case the applicable decision is to build controlled ingestion into a governed analytical landing zone.
Incorrect Answers
A:Fabric Warehouse provides a SQL-oriented analytics experience in Fabric. That concept explains Fabric Warehouse relational reporting; the situation instead concerns Analytical ingestion from operational systems. Missing ingestion error handling can silently omit entire business units.
C:Slicers provide user-driven data filtering rather than changing source rows. That concept explains Slicer interactive filter; the situation instead concerns Analytical ingestion from operational systems. Missing ingestion error handling can silently omit entire business units.
D:Reports and dashboards have different presentation and interaction roles. That concept explains Power BI reports dashboards and sharing; the situation instead concerns Analytical ingestion from operational systems. Missing ingestion error handling can silently omit entire business units.
Question 846
An Employee table stores DepartmentID and DepartmentName in every employee row. Which choice BEST meets this requirement?
- Add an index to repeated DepartmentName and claim transitive dependency disappears.
- Store department descriptions in their own referenced table.
- Configure supported network access restrictions and private endpoint where appropriate.
- Apply explicit SELECT projection and WHERE predicates.
Explanation
Correct Answer
B:Third normal form removes nonkey attributes dependent on other nonkey attributes.
Incorrect Answers
A:Add an index to repeated DepartmentName and claim transitive dependency disappears. It does not implement Third normal form transitive dependency. Repeating department names can create contradictory values.
C:Configure supported network access restrictions and private endpoint where appropriate. That action primarily handles Azure SQL firewall and private endpoint; the given requirement is Third normal form transitive dependency. Third normal form removes nonkey attributes dependent on other nonkey attributes.
D:Apply explicit SELECT projection and WHERE predicates. That action primarily handles SQL SELECT filtering WHERE; the given requirement is Third normal form transitive dependency. Third normal form removes nonkey attributes dependent on other nonkey attributes.
Question 847
A customer table changes hourly but full copies are costly. If the relevant Incremental ingestion with watermark safeguard is skipped, which failure is MOST directly associated with that omission?
- Correlation in points alone does not prove one variable caused the other.
- Sharing one report URL does not automatically authorize every underlying data source.
- Advancing the watermark before successful commit may skip data.
- Using a warehouse as a replacement for every OLTP payment transaction may be inappropriate.
Explanation
Correct Answer
C:Advancing the watermark before successful commit may skip data. Incremental load avoids repeated full snapshots while demanding consistent checkpoints. A suitable check is to replay source changes around failure and timestamp boundaries.
Incorrect Answers
A:Correlation in points alone does not prove one variable caused the other. This failure is associated with Scatter chart relationship; it is not the primary failure in the stated Incremental ingestion with watermark scenario. Incremental load avoids repeated full snapshots while demanding consistent checkpoints.
B:Sharing one report URL does not automatically authorize every underlying data source. This failure is associated with Power BI reports dashboards and sharing; it is not the primary failure in the stated Incremental ingestion with watermark scenario. Incremental load avoids repeated full snapshots while demanding consistent checkpoints.
D:Using a warehouse as a replacement for every OLTP payment transaction may be inappropriate. This failure is associated with Fabric Warehouse relational reporting; it is not the primary failure in the stated Incremental ingestion with watermark scenario. Incremental load avoids repeated full snapshots while demanding consistent checkpoints.
Question 848
A lake accepts new log fields without precreating SQL table columns. If the relevant Schema-on-read versus schema-on-write safeguard is skipped, which failure is MOST directly associated with that omission?
- Deferring all validation for payment records can admit unusable transactions.
- Assuming every document database query automatically provides relevance ranking can disappoint users.
- Selecting JSON solely because some fields are optional can complicate relational transactions.
- Calling a trend description a proven cause can mislead decisions.
Explanation
Correct Answer
A:Deferring all validation for payment records can admit unusable transactions. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores. A suitable check is to compare insertion-time errors with downstream schema interpretation tests.
Incorrect Answers
B:Assuming every document database query automatically provides relevance ranking can disappoint users. This failure is associated with Document indexing versus full-text search; it is not the primary failure in the stated Schema-on-read versus schema-on-write scenario. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.
C:Selecting JSON solely because some fields are optional can complicate relational transactions. This failure is associated with Relational rows versus document attributes; it is not the primary failure in the stated Schema-on-read versus schema-on-write scenario. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.
D:Calling a trend description a proven cause can mislead decisions. This failure is associated with Descriptive versus diagnostic analytics; it is not the primary failure in the stated Schema-on-read versus schema-on-write scenario. Schema enforcement timing differs between flexible raw storage and strongly typed operational stores.
Question 849
A dataset includes multilingual customer names and decimal amounts. After selecting the proper Text encoding and numeric parsing approach, which observation gives the clearest evidence of success?
- Valid records fit the specified columns while malformed field types are caught.
- Downstream stages start only after successful prerequisites.
- Reports calculate the same measure under the same filters.
- Sample accents and amounts survive round-trip without becoming different values.
Explanation
Correct Answer
D:Sample accents and amounts survive round-trip without becoming different values. This is the directly observable result for Text encoding and numeric parsing; data representation includes encoding and type interpretation beyond the filename.
Incorrect Answers
A:Valid records fit the specified columns while malformed field types are caught. This supports Structured records in a customer table, not confirmation of Text encoding and numeric parsing. The relevant evidence is that sample accents and amounts survive round-trip without becoming different values.
B:Downstream stages start only after successful prerequisites. This supports Data engineer orchestration dependencies, not confirmation of Text encoding and numeric parsing. The relevant evidence is that sample accents and amounts survive round-trip without becoming different values.
C:Reports calculate the same measure under the same filters. This supports Data analyst metric definition, not confirmation of Text encoding and numeric parsing. The relevant evidence is that sample accents and amounts survive round-trip without becoming different values.
Question 850
A project stores media files shared spreadsheets and device metadata. If the relevant Choosing Blob Files and Table for app needs safeguard is skipped, which failure is MOST directly associated with that omission?
- Assuming global writes automatically merge arbitrary business transactions may lose updates.
- Only replicating the latest share state may not recover accidental overwrites.
- One universal interface assumption leads to unsupported operations.
- Applying TTL to regulated records could violate retention obligations.
Explanation
Correct Answer
C:One universal interface assumption leads to unsupported operations. Azure Storage services expose distinct data models even within one storage account. A suitable check is to test object retrieval SMB mounting and key lookups separately.
Incorrect Answers
A:This failure is associated with Cosmos DB multi-region writes conflict handling; it is not the primary failure in the stated Choosing Blob Files and Table for app needs scenario.
B:Only replicating the latest share state may not recover accidental overwrites. This failure is associated with Azure Files snapshots and backups; it is not the primary failure in the stated Choosing Blob Files and Table for app needs scenario. Azure Storage services expose distinct data models even within one storage account.
D:Applying TTL to regulated records could violate retention obligations. This failure is associated with Cosmos DB TTL document expiration; it is not the primary failure in the stated Choosing Blob Files and Table for app needs scenario. Azure Storage services expose distinct data models even within one storage account.