What happens in steady when I change a dense dimension in Essbase?

Hi all

When I add/change/remove any member of Dimension Dense, what are the files that would be get restructured.

I know they are otl files, pag and ind but don't know how/why file ind gets restructured.

(Index files contains the only address to the actual data blocks which are formed by unique combinations of sparse dimension, but when we make changes to Dense dimension why file ind gets restructured).

Thank you

Amith

Amith, the index contains pointers existing blocks - it literally tells Essbase where in the .pag files to find a particular block.  If the blocks change size / move (because they will be in a dense restructuring implied), the updated index.

Take Sample.Basic for example.  If the block for "NYC"->"100-10" exists from the 1000th byte of ess00001.pag, the index entry for "New York"-> "100-10" will take account of this.  Then, we perform an implicit restructuring by removing a few dense members.  The block for "New York"-> "" 100-10 will always exist, but it might be present in the file from the 500th byte.  The entry of index for "New York" file-> "" 100-10 must be updated.

See optimizing database restructuring in the database administrator's Guide (Sreekumar post above is actually taken from this section).

Tags: Business Intelligence

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