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author's profile photo Former Member
Former Member

ODS index

Hi,

I want to know how to delete and create ODS index in process chain. I only see it in cube load, not ODS.

Thanks.

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    author's profile photo Former Member
    Former Member
    Posted on Jun 13, 2006 at 09:17 PM

    ODS Index creation and deletion will be taken care by the basis team. Please check with your basis team. Also it is not a best practice and definitely not required to delete and create the index in the ODS every time.

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  • author's profile photo Former Member
    Former Member
    Posted on Jun 14, 2006 at 07:33 PM

    This might not apply to all DBs that BW runs on -

    InfoCubes have mulitple <b>bitmap</b> indices built on the fact table (except for line item and high cardinality dimensions which are btree indices).

    The indices that BW builds on ODS are <b>btree</b>.

    The database can update the <b>btree</b> indices reasonably quickly. <b>Bitmap</b> indices, however, due to their design, are NOT updated very efficiently and that is the reason it is recommended to drop them before a load and rebuild them afterwards.

    As with any rule, there are exceptions, with very large InfoCubes, the time to rebuild the indices can become significant. And in these cases, you might opt not to drop and rebuild with every load, and instead, perhaps drop and rebuild over a weekend or monthly. Would depend on the volume of new records being added relative the the number of records in the fact tables.

    Oracle 10i is supposed to have be able to update bitmap indices more efficiently, so that might change what we do in BW.

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