## Hyperion Essbase 5 Interview Questions & Answers

1. Question 1. What Are The Two Storage Options Available In Essbase And What Are The Differences?

ASO (Aggregate Storage Option) ­ Used for

• If we have large number of dimensions (generally more than 10).
• Most of the dimensions are sparse.
• We cannot write back in ASO. I heard recently that ASO will also have the write back capability.

BSO (Block Storage Option)­

• Dimensions are less and dense (recommended values for no of dim are between 4 and 8) .
• We can write back hence much suited for planning applications.Financial applications are generally dense structures and normal analytical cubes are sparse. Here we also need to understand what these dense and sparse members are. When the intersections or cells of two dimensions mostly contain a value it is dense.
• Say for example we have two dimensions period(Month or quarter) and region and we are calculation the sales amount. Generally maximum regions(countries, cities) will have some sales value for a particular month or quarter. Hence we can say that our period dimensions would be dense. But now instead of period, consider another dimension product. Now there are some products which are sold in only some particular regions hence for them there will be no values in other regions or will have very low percentage of data values hence the structure will become sparse.
2. Question 2. Can We Build Dimensions Directly From Data Sources Without Using Rule Files.

No. we cannot build dimensions directly from data sources without using rule files.

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4. Question 3. When Do We Generally Use Build Rules Files?

To automate the process of creating dimensions with thousands of members.

5. Question 4. What Are The Three Primary Build Methods For Building Dimensions?

1. Generation references.
2. level references.
3. Parent­Child references.
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7. Question 5. In What Case We Can Define Generation 1 To A Field In Generation Build Method.

We cannot define that as Generation 1 is not valid.

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9. Question 6. Suppose We Have Assigned Generation 2 And Generation 4 As Of Now And Think Of Adding Generation 3 Later Some Time. Can We Build The Dimension.

No. If gen 2 and gen 4 exists, we must assign gen 3.

10. Question 7. Can We Create More Than 2 Dimensions Using Only One Build Rule File.

Yes, we can do that but it is recommended to use separate rule file for each dimension.

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12. Question 8. What Is Uda( User Defined Attributes). How Are They Different Than Aliases.

UDA represents the class of the members. Aliases are just another names of the members. both are different and has different usage.

13. Question 9. Can We Query A Member For Its Uda In A Calculation Script.

Yes. You can query a member for its UDA in a calculation script.

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15. Question 10. How Does Uda’s Impact Database Size?

Absolutely no impact as UDA’s does not require additional storage space.

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17. Question 11. What Is The Difference Between Uda’s And Attribute Dimensions?

Attribute dimensions provides more flexibility than UDA’s. Attribute calculations dimensions which include five members with the default names sum, count, min, max and avg are automatically created for the attribute dimensions and are calculated dynamically.

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19. Question 12. How Does Attribute Dimensions And Uda’s Impact Batch Calculation Performance?

UDA’s­ No Impact as they do not perform any inherent calculations.Attribute dim­ No Impact as they perform only dynamic calculations.

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21. Question 13. How Can We Display Uda’s In Reports? How Do They Impact Report Report Performance.

UDA’s values are never displayed in the reports and hence do not impact report performance.

22. Question 14. How Does Attribute Dim Impact Report Performance?

They highly impact the report performance as the attributes are calculated dynamically when referenced in the report. For very large number of att dim displayed in the report, the performance could drastically reduce.

23. Question 15. While Loading The Data, You Have Applied Both The Selection Criteria As Well As Rejection Criteria To A Same Record.what Will Be The Outcome.

The record will be rejected.

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25. Question 16. How Is Data Stored In The Essbase Database?

Essbase is an file based database where the data is stored in PAG files of 2 GB each and grows sequentially.

26. Question 17. Can We Have Multiple Databases In One Single Application?

Yes. But only one database per application is recommended.

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28. Question 18. Can We Have One Aso Database And One Bso Database In One Single Application. If Yes, How And If No, Why.

No. Because we define ASO or BSO option while creating the application and not database. Hence if the application is ASO, the databases it contains will be that type only.

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30. Question 19. What Are The File Extensions For An Outline, Rule File And A Calc Script.

.OTL, .RUL and .CSC.

31. Question 20. What Is The Role Of Provider Services.

To communicate between Essbase and Microsoft office tools.

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33. Question 21. What Is An Alternative To Create Meta Outline, Rule File And Load Data.

Integration services and in version 11, we have Essbase studio.

34. Question 22. Can We Start And Stop An Application Individually. How Can This Be Used To Increase Performance.

Yes. We can manage our server resources by starting only the applications which receive heavy user traffic. When an application is started, all associated databases are brought to the memory.

35. Question 23. We Have Created An Application As Unicode Mode. Can We Change It Later To Non­unicode Mode.

No.We cannot change to nonunicode mode.

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37. Question 24. How Can I Migrate An Application From My Test Environment To The Production Environment?

Hyperion Administrative services console provides a migration utility to do this but only the application, database objects are migrated and no data is transferred.

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39. Question 25. A Customer Wants To Run Two Instances Of An Essbase Server On A Same Machine To Have Both Test Env And Development Env On The Same Server. Can He Do That?

Yes. We can have multiple instances of an Essbase server on a single machine and there will be different sets of windows services for all these instances.

40. Question 26. Suppose I Have A Dimension A With Members B And C And I Do Not Want B And C To Roll Up To A. How Can I Do This.

Using (~) exclude from consolidation operator.

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42. Question 27. What Does Never Consolidate Operator (^) Do?

It prevents members from being consolidate across any dimension.

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44. Question 28. What Is Hybrid Analysis?

Lower level members and associated data remains in relational database where as upper level members and associated data resides in Essbase database.

45. Question 29. Why Top­down Calculation Less Efficient Than A Bottom­up Calculation?being Less Efficient, Why Do We Use Them.

In the process it calculates more blocks than is necessary. Sometimes it is necessary to perform top­down calculation to get the correct calculation results.

46. Question 30. On What Basis You Will Decide To Invoke A Serial Or Parellel Calculation Method.

If we have a single processor, we will use serial calculation but if we have multiple processors we can break the task into threads and make them run on different processors.

47. Question 31. What Is Block Locking System?

Analytic services (or Essbase Services) locks the block and all other blocks which contain the Childs of that block while calculating this block is block locking system.

48. Question 32. What Are The Types Of Partitioning Options Available In Essbase?

1. Replicated partition.
2. Transparent partition
49. Question 33. Dynamic Calc Decreases The Retrieval Time And Increases Batch Database Calculation Time. How True Is The Statement?

The statement should be just opposite. As dynamic calc members are calculated when requested, the retrieval time should increase.

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51. Question 34. Can We Have Multiple Meta Outlines Based On One Olap Model In Integration Services?

Yes.we have multiple meta outlines based on one OLAP model in Integration services.

52. Question 35. What Are Lro’s( Linked Reporting Objects)?

They are specific objects like files, cell notes or URL’s associated with specific data cells of Essbase database. You can link multiple objects to a single data cell.These linked objects are stored in the server. These LRO’s can be exported or imported with the database for backup and migration activities.

53. Question 36. What Is Custom Based Macro?

Essbase macros that we write with Essbase calculator functions and special macro functions. Custom-defined macros use an internal Essbase macro language that enables you to combine calculation function and operate on multiple input parameters.

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55. Question 37. What Do You Mean By Dirty Block?

A data block containing cells that have been changed since the last calculation. Upper level blocks are marked as dirty if their child blocks are dirty (that is, have been updated)

56. Question 38. How Does Uda’s Impact Database Size?

Absolutely no impact as UDA’s do not require additional storage space.

57. Question 39. What Does Never Consolidate Operator(^) Do?

It prevents members from being consolidate across any dimension.

58. Question 40. Why Are Filters Used?

If you want to grant access to all dimensions then you wouldn’t use a filter. Just grant read access for the database to the user and/or group. The only reason you would use a filter is if you wanted to restrict access.

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60. Question 41. Can We Have Multiple Metaoutlines Based On One Olap Model In Integration Services?