Discoverer Error

Hi Friends,
I am getting "Join configuration cannot be resolved Reason : more than 1 of the detail folder uses non-aggregated items." while developing discoverer report using disc. desktop . When we can get this error and how to avoid it.
Minakshi

Hi Minakshi
In its simplest form a star schema is one where you have one central folder with all of the other folders joined to it using a 1:N join from the outer folders to the central folder. None of the outer folders join to each other and none of the outer folders have joins to any sub folders. This is the ideal data model to work with in Discoverer, if you can do it.
A snowflake is when there is still a central folder with other folders radiating outwards. However, the outer folders themself join to other folders which in turn join to even more. Eventually you end up with the same folder being joined by two or more other folders, with there being more than one way to get from A to B. This is when you get the error you have described.
The solution, as commented by Russ, Esther and others, is to use a database view where you take control of the joins, as opposed to letting Discoverer decide. Don't be afraid of database views - they have their place in this Discovever world as do materialized views, VPDs, partitions, and other complex constructs that some organizations shy away from just because of the complexity.
Best wishes
Michael

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    at oracle.ias.upgrade.config.discoverer.DiscoConfigUpgrade.upgradeItem(DiscoConfigUpgrade.java:302)
    at oracle.ias.upgrade.config.discoverer.DiscoConfigUpgrade.doUpgrade(DiscoConfigUpgrade.java:191)
    at oracle.ias.upgrade.UpgradeSupport.doUpgrade(UpgradeSupport.java:1633)
    at oracle.ias.upgrade.gui.UAUpgradeThread.run(UAUpgradeThread.java:493)
    [2009-12-03T14:41:15.144-06:00] [Framework] [ERROR] [UPGAST-00138] [upgrade.Framework] [tid: 13] [ecid: 0000ILMHVhH1nZLiEPsHsS1B6263000004,0] upgrade exception occurred
    [2009-12-03T14:41:15.144-06:00] [Framework] [ERROR] [] [upgrade.Framework] [tid: 13] [ecid: 0000ILMHVhH1nZLiEPsHsS1B6263000004,0] Cause: An unexpected upgrade exception has occurred. Action: See the secondary error message for additional details.
    [2009-12-03T14:41:15.144-06:00] [Framework] [ERROR] [] [upgrade.Framework] [tid: 13] [ecid: 0000ILMHVhH1nZLiEPsHsS1B6263000004,0] UPGCMP-01001: unexpected upgrade exception
    After commenting out the particular preference the upgrade fail with another preference, and finally the discooverer upgraded successfully.
    So now the customer wants to know what could be the reason for the upgrade failure.
    It it because of the preferences are not valid in Discoverer 11g?
    Following is the list of preferences the customer commented out:
    [Administrator]
    ###ShowUserTypeChoice
    ###DefaultUserTypeIsApps
    ###ExcelVersion
    ###[Crosstab] <-- Entire section
    ###Default Title
    ###Title
    ###Axis Label
    ###Cell XGridline
    ###Cell YGridline
    ###Axis Style
    ###[Table] <-- Entire section
    ###Default Title
    ###Title
    ###Cell XGridline
    ###Cell YGridline
    ###Row Headings
    ###Show Annotations
    ###GraphDataModel
    Any help in this regarding is highly appreciated.
    Thanks in advance.
    Regards,
    Padmanabh.

    Hi Padmanabh
    How are you doing the upgrade?
    Personally, because you have to use a new weblogic server anyway I would install a clean 11g and then re-apply any preferences. With that done I would export the entire EUL from 10g and import it into the clean 11g. You'll be up and running in no time at all.
    There is no need to upgrade the EUL as it is the same in both 10g R2 and 11g.
    Best wishes
    Michael

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