Clustering and multi dimensional clustering?

hi friends,
why do we need Clustering and multi dimensional Clustering in bi 7.0?
can i get any scenerio?
Regards,
suneel.

Hi Suneel,
You can get some good info here: http://help.sap.com/saphelp_nw70/helpdata/en/79/401442499cca7ee10000000a1550b0/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/en/02/5cf74153b6ca17e10000000a155106/content.htm
Hope this helps...

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    > Page Clustering can be activated with parameter: DATA_IO_BLOCK_COUNT
    > Then tables can be migrated with SQL-Statement: ALTER TABLE <table name> CLUSTER
    Ok, page clustering is not documented yet (just as prefetching is not officially documented) and not released for OLTP.
    > I activated this only for one table. This table now is read much faster.
    >
    > My questions.
    > Is there a documentation available for this features?
    Hmm.. you're using undocumented features - what do you expect?`
    No, currently there is no official documentation.
    There is work going on to provide official documentation but none of it is released yet (and it will take some more time!)
    > How can I "uncluster" clustered tables?
    ALTER TABLE <tablename> NOT CLUSTER
    > When this features are activated, expensive sql-statements are processed much faster. Because of the high workload on storagesystem, all other transaction may get slower?
    It's not that simple.
    Both features address specific issues and are used only in very specific circumstances.
    The clustering feature will not improve performance if the table is not accessed via the cluster key.
    In fact, it may even decrease performance if this is done.
    Also, at the moment clustered tables don't stay clustered on updates/inserts/deletes.
    Therefore it is not necessarily a good idea to cluster tables like REPOLOAD pr REPOSRC on a development system.
    regards,
    Lars

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