Updating olap dimensions

A dimension instance is strict if every element of the dimension has a unique ancestor element in each of the ancestor categories.

TSOLAP conforms to the OLE DB for OLAP norm, so it can be used by any client application based on this norm, and can use as backend any conformant relational server.

..." When changes occur on data organization, conventional multidimensional structures are not adapted because dimensions are supposed to be static.

We propose an approach allowing to track history but also to compare data, mapped into static structures.

Some of them, the updating models =-=[1,2,7,8]-=-, focus on mapping data into the most recent version of the structure, whereas tracking history models [3,5,6,11,14] keep trace of evolutions of the system. In practice, dimension updates are often needed to adapt the warehouse to changing re uirements.

In earlier work, we defined a taxonomy for these dimension updates and a minimal set of operators to perform them.

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In order to study summarizability in heterogeneous schemas, ... When changes occur on data organization, conventional multidimensional structures are not adapted because dimensions are supposed to be static.

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