SAP BI/BW 初中高级问题及答案（高級）

   

Quiz: SAP BI/BW -- advanced level

1. Select the correct statements about the steps executed by a change run.

a. The steps activate the new master data and hierarchy data changes.

b. All aggregates are realigned and recalculated.

c. Aggregates containing navigational attributes are realigned and recalculated for the master data changes.

d. The steps delete the 'A' (active) records for which the 'M' (modified) records exist from master data tables, and makes all modified records active.

e. All of the above.

2. Key figures that are set for exception aggregation MIN or MAX in an aggregate cause the aggregates to be completely rebuilt for each change run alignment.

a. True

b. False

3. If special characters are not defined in transaction RSKC in BW then:

a. These characters cannot be loaded into BW at all.

b. These characters can only be loaded into text fields.

c. These characters can be loaded into attributes and texts.

d. BW won't be able to generate the SIDs for these characters because all the fields where SIDs are generated cannot be loaded.

e. None of the above.

4. A change run updates the 'E' table of the aggregates while doing the alignment for changes in the master data.

a. True

b. False

5. Select the correct statements related to the control parameters for a data transfer in table ROIDOCPRMS in the BW source system.

a. The field MAXSIZE is the maximum number of records which can be transferred to BW in a single packet.

b. The field MAXSIZE is the size in KB which is used to calculate the number of records per data packet.

c. MAXLINES is the maximum number of records which can be transferred to BW per data load.

d. If the number of data records per packet exceeds MAXLINES value the extraction process fails.

6. Identify the differences between an Infoset and a Multiprovider.

a. Both Multiproviders and Infosets can contain all the info providers in BW.

b. Queries built on Multiproviders use 'union' and queries on Infosets use 'join' to retrieve data from different info providers.

c. Both Multiproviders and Infosets do not have data, but data is accessed from the basic info providers used in these objects.

d. None of the above.

7. Select the correct statements about the OLAP Cache Monitor in BW.

a. The transaction for the OLAP Cache Monitor is RSRCACHE.

b. If the persistent mode is inactive then the cache is inactive and query results will not be cached in memory.

c. A 'read flag' is set in the Cache Monitor when data is read from the cache.

d. When new data is loaded into the info provider which the query is built on, the cache for that query is invalidated.

e. All of the above.

8. Select the correct statements about ODS settings.

a. Performance of the ODS activation improves when the BEx reporting flag is switched to off.

b. Overwriting a data record is not allowed if the 'unique' data record flag is set.

c. Data targets are updated from the ODS regardless of the ODS activation status.

d. All of the above.

9. It is not possible to activate an ODS which contains a request from a full load and a Delta Initialization load of the same data source.

a. True

b. False

10. Select the correct statements regarding data deletion settings in an InfoPackage.

a. It is possible to set an InfoPackage to delete all the data in an InfoCube during the loads.

b. Only uncompressed data can be set to be deleted from the cube in an InfoPackage during the loads.

c. Deletion settings can be done only for basic InfoCubes.

d. Data deletion settings in an InfoPackage are possible only for full loads.

e. All of the above.

11. Select the correct statements about parallel processing in Multiproviders.

a. Multiprovider queries create one process per info provider involved and are processed parallel by default.

b. It is not possible to make Multiprovider queries run sequential.

c. Multiprovider queries create a parent process which provides a synchronization point to collect the overall result from other sub processes.

d. Parallel processing is always faster than sequential processing in Multiproviders.

e. All of the above.

12. Select the correct statements about the ALPHA conversion routine in BW.

a. An ALPHA conversion routine is assigned to a characteristic info object automatically when it is created.

b. An ALPHA conversion routine is used to convert characteristic values from 'external to internal' values only.

c. Conversion is done on alphabets and numeric input values.

d. An ALPHA conversion routine removes the spaces on the right side of numeric values and right aligns them.

e. The left side of the numeric input values are filled with zeros.

13. Select the correct statements related to navigational attributes.

a. It is better to avoid using navigational attributes from a query performance point of view.

b.If a navigational attribute is used in an aggregate, the aggregate needs to be adjusted every time there is a change in the values of this attribute.

c. An attribute included as a characteristic in the InfoCube has the same effect as being used as a navigational attribute in the cube.

d. A navigational attribute can be made to display an attribute without removing data from the InfoCube.

e. None of the above.

14. A 'Check for Referential Integrity' can only be possible for information sources with flexible updating.

a. True

b. False

15. Select the correct statements about physical partitioning in BW.

a. New partitions on F table of an InfoCube are created during data loads to the InfoCube.

b. An E fact table is created when activating an InfoCube with a number of partitions corresponding to the partition value range.

c. If a cube is not partitioned before populating with data, it is not possible to partition the cube without removing all the data.

d. PSA table partitions can contain more than one request.

e. All of the above.

   

   

Question #1: A, C, D

Master data and hierarchy data changes are activated and all the aggregates which have navigational attributes which will be affected by the changes are realigned. Change run deletes all active records for which modified records exists in master data 'P' table and makes all modified records to active.

Question #2: A

If an aggregate contains key figures which are built as MIN or MAX, that will force a change run to recreate these aggregates during the alignment process.

Question #3: B, D

Unless specified using transaction RSKC, special characters cannot be loaded into BW fields where it needs to generte SIDs. So it is possible for these characters to be loaded into text fields.

Question #4: B

A change run doesn't update the 'E' table of the aggregates for the alignment of aggregates due to master data changes. The alignment is done by inserting rows with the necessary negative and positive key figure values in the 'F' table.

Question #5: B

In the table ROIDOCPRMS, MAXSIZE is the size in kilobytes which is used to calculate the number of records in each datapacket to be transferred to BW. If the calculated number of records exceeds MAXLINES, the packet size in terms of number of records will be made the same as the value of MAXLINES value.

Question #6: B, C

A Multiprovider can be built on basic InfoCubes, ODSs, info objects or Infosets. An Infoset can have only ODSs or info objects. Multiproviders use 'union' operation but Infosets use 'join'. Both the objects are logical definitions which don't store any data.

Question #7: A, C, D

Transaction RSRCACHE is for the Cache Monitor. The OLAP Cache will be active unless the 'cache inactive' flag is set. Persistent mode is to specify the action to be taken when the cache memory is exhausted.

Question #8: A, B

If the BEx Reporting flag is switched off than the SID won't have to be taken when activating the ODS. This improves performance. If the 'unique data records' flag is set, it is not possible to load records to the ODS for which the key combination already exists. Data targets can be updated only after the ODS activation takes place successfully.

Question #9: B

It is possible to activate an ODS which contains Delta and full loads from the same InfoSource if the full load is done with the repair flag set in the InfoPackage.

Question #10: A, C

All data can be set to be deleted from a basic cube during full loads and Delta loads. Data can be deleted depending on various conditions. Data can only be deleted from basic cubes, not the ODS.

Question #11: A, C

Multiprovider queries create processes to run on the individual info providers involved. These processes run parallel by default. The parent process provides a synchronization point to collect overall results from sub processes. Many times the parallel processing may be slower than sequential processing, if the data volume is high.

Question #12: A, D, E

The ALPHA conversion routine is assigned to the characteristic info objects when created. This needs to be deleted manually if not required. The conversion is applied to 'external to internal' formats and vice versa. For 'external to internal' formats, the values are right aligned and the spaces on left side is padded with zeros.

Question #13: A, B, D

Queries using navigational attributes will be slower since additional tables have to be joined with the Fact tables to get the desired results. If there are changes to the values of navigational attributes, the aggregates using these will have to be readjusted, which is done by a change run. Navigational attributes can be made to display only without removing the data from the cube.

Question #14: A

A referential integrity check is only possible for info sources with flexible updating

Question #15: E

The 'F' Fact table is partitioned on request and is created during data loads. The 'E' Fact table of the InfoCube is created with the number of partitions specified in the partitioning range. Once the data is loaded to the cube, partitioning based in the Time characteristic is not possible without removing the data. PSA table partitions can contain more than one request.

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