Five questions about OLAP makes me confused.

1. Why do we need to map the level twice in the dimension and cube? I don't know when we cube mapping, only map the lower of
a hierarchy. And what happens if a member of level even has been mapped with different columns of the source table?

2. it defines several hierarchies of a dimension, then why do we need set one of them as the default hierarchy? In
which scenario we need to define multiple hierarchies?

3. When you create a Cube, there is an option in the aggregation-> precompute-> Cost_base aggregation - > percentage, that means
'Percentage' used for? For a performance?

4. when I do surgery in AWM, sometimes with a few errors. But it's really hard to understand what it is
This means. As the error message below.
/*********
The transaction is not pensionable: "an error has occurred on the server.
Class of error: failure of the Express
Server error descriptions:
DPR: Failed to create the server-side, generic cursor at TxsOqDefinitionManager::generic < CommitRoot >
INI: XOQ-01600: OLAP DML error 'object OLAPTRAIN of the analytic workspace. SALESTRACK!
There is no such thing as SALES_CUBE_PRODUCT_ALERT. "while executing DML 'SYS. AWXML! R11_MANAGE_CUBE
('SALES_CUBE.) CUBE' "DELETE") ', generic for TxsOqStdFormCommand::execute '.
"
at oracle.olapi.transaction.BaseTransaction.commit (unknown Source)
at oracle.olapi.transaction.BaseTransactionProvider.commitCurrentTransaction (unknown Source)
at oracle.olap.awm.dataobject.DatabaseDO.commitOLAPI (unknown Source)
at oracle.olap.awm.dataobject.aw.WorkspaceDO.commitOLAPI (unknown Source)
at oracle.olap.awm.dataobject.olapi.UModelDO.commitOLAPI (unknown Source)
at oracle.olap.awm.dataobject.olapi.UModelDO.delete (unknown Source)
at oracle.olap.awm.dataobject.olapi.UCubeDO.delete (unknown Source)
at oracle.olap.awm.navigator.node.DeleteThread.run (unknown Source)
************/
When he said "object OLAPTRAIN of the analytic workspace. SALESTRACK! There is no such thing as SALES_CUBE_PRODUCT_ALERT. "I do not yet know
What is SALES_CUBE_PRODUCT_ALERT and where I can find the most detailed information for me solve the problem. I want to say is here
a manual or a reference Oracle provided to help developers?

5. is it important the order of Join Condition when we the mapping of a cube to resouce, such as a = b or b = a? What type of join is, LEFT JOIN, RIGHT JOIN, OUTER JOIN, or INNER JOIN?

Thank you

Satine

You arrive on the % figure after seeing the results of time reporting and cube loading time. This can be an iterative work, but should be fruitfull later.

Thank you
Brijesh

Published by: BGaur on May 11, 2009 17:02

Tags: Business Intelligence

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