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[Hardware] C-BW4H-2505英語版 & C-BW4H-2505合格体験談

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【Hardware】 C-BW4H-2505英語版 & C-BW4H-2505合格体験談

Posted at 3 hour before      View：1 | Replies：0        Print      Only Author   [Copy Link] 1#
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SAP Certified Associate - Data Engineer - SAP BW/4HANA 認定 C-BW4H-2505 試験問題 (Q14-Q19):質問 # 14
Which external hierarchy properties can be changed in the query definition? Note: There are 3 correct answers to this question.
  • A. Time dependency
  • B. Exp to level
  • C. Position of child nodes
  • D. Display text nodes
  • E. Sort direction
正解：B、D、E
解説：
In SAP Data Engineer - Data Fabric, particularly when working with hierarchies in query definitions, external hierarchies are used to organize and structure data in a meaningful way for reporting and analysis. External hierarchies are predefined hierarchies that can be integrated into queries, and certain properties of these hierarchies can be adjusted within the query definition to meet specific reporting requirements.
* B. Sort direction
* The sort direction determines the order in which the hierarchy nodes are displayed in the query results. You can choose to sort the hierarchy in ascending or descending order based on node names, key values, or other attributes. This property is adjustable in the query definition to allow flexibility in how the data is presented to end users.
* In SAP BW (Business Warehouse) and SAP Data Engineer - Data Fabric, sorting options for hierarchies are available in the query designer under the hierarchy settings.
C). Exp to level
The "Exp to level" property allows you to specify the depth to which the hierarchy should be expanded when displayed in the query results. For example, if you set "Exp to level" to 3, the hierarchy will automatically expand to show all nodes up to the third level. This is useful for controlling the granularity of data displayed without requiring manual expansion by the user.
Reference: In SAP BW Query Designer, this property is part of the hierarchy display settings and can be configured during query design.
D). Display text nodes
The "Display text nodes" property controls whether text nodes (descriptive labels) are shown alongside the hierarchy nodes in the query output. Text nodes provide additional context or descriptions for each node, making the hierarchy easier to interpret for end users.
Reference: This property is commonly used in SAP BW and SAP Data Engineer - Data Fabric to enhance the readability of hierarchical data in reports.
Incorrect Options:A. Position of child nodes
The position of child nodes within a hierarchy is determined by the hierarchy's structure and cannot be altered in the query definition. It is a fixed property defined during the creation of the hierarchy in the backend system.
Reference: SAP documentation specifies that structural properties like node positions are not modifiable at the query level.
E). Time dependency
Time dependency is a characteristic of the hierarchy itself, indicating whether the hierarchy changes over time (e.g., organizational structures that evolve). This property is defined during the creation of the hierarchy and cannot be changed in the query definition.
Reference: SAP BW and SAP Data Engineer - Data Fabric treat time-dependent hierarchies as static entities in the query context, meaning their time dependency cannot be altered dynamically.
Conclusion:The three correct answers-Sort direction,Exp to level, andDisplay text nodes-are properties that can be modified in the query definition to customize the presentation of external hierarchies. These adjustments provide flexibility in how hierarchical data is displayed and analyzed, enhancing the usability of reports and dashboards in SAP Data Engineer - Data Fabric environments.

質問 # 15
Which modeling decisions may have side effects on runtime performance? Note: There are 3 correct answers to this question.
  • A. Uncheck the "Write change log" property for a Stard DataStore Object.
  • B. Use a transitive attribute instead of an attribute that is directly assigned to a characteristic.
  • C. Move a characteristic within a DataMart DataStore object to a different group.
  • D. Include a characteristic from the underlying DataMart DataStore Object in the CompositeProvider instead of a navigation attribute.
  • E. Change a time-independent attribute of a characteristic to a time-dependent attribute.
正解：A、B、D
解説：
When modeling data in SAP BW/4HANA, certain decisions can have significant side effects on runtime performance. Let's analyze each option:
* Option A: Use a transitive attribute instead of an attribute that is directly assigned to a characteristic.
Transitive attributes are derived attributes that depend on other attributes in the data model. Using a transitive attribute instead of a directly assigned attribute introduces additional complexity during query execution because the system must calculate the value dynamically based on the underlying relationships. This can lead to slower query performance, especially for large datasets.
* Option B: Uncheck the "Write change log" property for a Standard DataStore Object.Disabling the
"Write change log" property improves performance rather than degrading it. By not writing changes to the change log, the system reduces the overhead associated with tracking historical data. Therefore, this decision does not negatively impact runtime performance.
* Option C: Move a characteristic within a DataMart DataStore object to a different group.Moving a characteristic to a different group within a DataMart DataStore Object primarily affects the logical organization of data but does not directly impact runtime performance. The physical storage and query execution remain unaffected by such changes.
* Option D: Change a time-independent attribute of a characteristic to a time-dependent attribute.
Converting a time-independent attribute to a time-dependent one introduces additional complexity into the data model. Time-dependent attributes require the system to manage multiple versions of the attribute over time, which increases the volume of data and the computational effort required for queries. This can significantly degrade runtime performance, especially for queries involving large datasets or frequent updates.
* Option E: Include a characteristic from the underlying DataMart DataStore Object in the CompositeProvider instead of a navigation attribute.Including a characteristic directly from the underlying DataMart DataStore Object in the CompositeProvider can improve performance compared to using a navigation attribute. Navigation attributes require additional joins during query execution, which can slow down performance. However, if the question implies replacing a navigation attribute with a direct characteristic, this decision can have positive performance implications. Conversely, if the reverse is implied (using navigation attributes instead of direct characteristics), it would degrade performance.
References:SAP BW/4HANA Modeling Guide: Explains the impact of transitive attributes, time-dependent attributes, and navigation attributes on query performance.
SAP Help Portal: Provides detailed documentation on best practices for optimizing data models in SAP BW
/4HANA.
SAP Community Blogs: Experts often discuss the performance implications of various modeling decisions in real-world scenarios.
In summary, options A, D, and E involve modeling decisions that can negatively impact runtime performance due to increased computational complexity or additional joins during query execution.

質問 # 16
You created a generic DataSource in SAP ERP but did not release the DataSource for Operational Data Provisioning (ODP). What is the effect in SAP BW/4HANA?
  • A. The ODP DataSource can be generated using the DataFlow generation feature.
  • B. The ODP DataSource has to be created using the ODP_SAP source system type.
  • C. The ODP DataSource cannot be replicated using the ODP_SAP source system type.
  • D. The ODP DataSource has to be created using the ODP_HANA source system type.
正解：C
解説：
When working withOperational Data Provisioning (ODP)in SAP BW/4HANA, it is essential to release the DataSource in the source system (e.g., SAP ERP) for ODP before it can be used in the target system (SAP BW
/4HANA). If the DataSource is not released for ODP, certain limitations arise during the replication process.
* The ODP DataSource cannot be replicated using the ODP_SAP source system type (Option C):
* In SAP BW/4HANA, when a DataSource is created in the source system (e.g., SAP ERP), it must be explicitly released for ODP to enable replication via theODP_SAP source system type.
* If the DataSource is not released for ODP, the replication process will fail because the metadata required for ODP replication is not available in the source system.
* This limitation applies specifically to theODP_SAP source system type, which relies on the ODP framework to extract data from SAP source systems.
* The ODP DataSource can be generated using the DataFlow generation feature (Option A):While the DataFlow generation feature in SAP BW/4HANA simplifies the creation of data flows, it does not bypass the requirement to release the DataSource for ODP. Without releasing the DataSource, replication will still fail.
* The ODP DataSource has to be created using the ODP_HANA source system type (Option B):
TheODP_HANA source system typeis used for extracting data from SAP HANA-based sources, not SAP ERP or other SAP systems. This option is irrelevant to the scenario described.
* The ODP DataSource has to be created using the ODP_SAP source system type (Option D):While the ODP_SAP source system type is used for SAP source systems, the issue here is not about creating the DataSource but rather about the inability to replicate it due to the lack of ODP release in the source system.
* ODP Release Requirement:Releasing a DataSource for ODP in the source system ensures that the necessary metadata and extraction logic are available for replication in SAP BW/4HANA.
* ODP_SAP Source System Type:This type is specifically designed for SAP source systems and relies on the ODP framework to manage delta queues and data extraction.
* SAP Note 2358900 - Operational Data Provisioning (ODP) in SAP BW/4HANA:This note explains the requirements and steps for enabling ODP replication, including the need to release DataSources in the source system.
* SAP BW/4HANA Data Modeling Guide:This guide provides detailed information on setting up and managing ODP connections between SAP BW/4HANA and source systems.
* Link:SAP BW/4HANA Documentation
Why Other Options Are Incorrect:Key Points About ODP and DataSource Replication:
References to SAP Data Engineer - Data Fabric:By ensuring that the DataSource is released for ODP, you avoid replication issues and ensure seamless data extraction into SAP BW/4HANA.

質問 # 17
What are some of the benefits of using an InfoSource in a data flow? Note: There are 2 correct answers to this question.
  • A. Providing the delta extraction information of the source data
  • B. Splitting a complex transformation into simple parts without storing intermediate data
  • C. Enabling a data transfer process (DTP) to process multiple sequential transformations
  • D. Realizing direct access to source data without storing them
正解：B、C
解説：
An InfoSource in SAP BW/4HANA is a logical object used in data flows to facilitate the movement and transformation of data between source systems and target objects (e.g., DataStore Objects, InfoCubes). Let's analyze each option to determine why A and C are correct:
* Explanation: An InfoSource allows you to break down a complex transformation into smaller, manageable steps. This modular approach simplifies the design and maintenance of data flows.
Importantly, the intermediate results are not stored permanently, which optimizes storage usage and improves performance.
* In SAP BW/4HANA, InfoSources act as intermediate layers that streamline data processing by enabling step- by-step transformations without creating additional persistent storage layers.
2. Providing the delta extraction information of the source data (Option B)Explanation: Delta extraction is typically handled by the source system or the Data Transfer Process (DTP), not by the InfoSource itself.
The InfoSource is primarily a logical container for organizing and transforming data, not for managing delta mechanisms.
Reference: Delta handling is configured at the source system or extractor level and is managed through DTP settings. The InfoSource does not play a direct role in this process.
3. Enabling a data transfer process (DTP) to process multiple sequential transformations (Option C) Explanation: An InfoSource can be used to chain multiple transformations together, allowing a single DTP to process these transformations sequentially. This capability enhances the flexibility and efficiency of data flows by consolidating multiple steps into a single process.
Reference: In SAP BW/4HANA, InfoSources serve as intermediaries that enable seamless integration of multiple transformations within a single DTP, reducing complexity and improving performance.
4. Realizing direct access to source data without storing them (Option D)Explanation: Direct access to source data without storage is achieved through Virtual Providers or other real-time data access mechanisms, not through InfoSources. InfoSources are designed to temporarily hold transformed data during the data flow process.
Reference: Virtual Providers bypass the need for physical storage by directly accessing source data.
InfoSources, on the other hand, are part of the physical data flow architecture and involve temporary storage of transformed data.
ConclusionThe correct answers areA (Splitting a complex transformation into simple parts without storing intermediate data)andC (Enabling a data transfer process (DTP) to process multiple sequential transformations). These benefits highlight the flexibility and efficiency that InfoSources bring to data modeling and transformation processes in SAP BW/4HANA.

質問 # 18
You need to derive an architecture overview model from a key figure matrix. Which is the first step you need to take?
  • A. Identify sources.
  • B. Define data marts.
  • C. Analyze storage requirements.
  • D. Identify transformations.
正解：B

質問 # 19
......
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