By Tho Manh Nguyen
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Extra resources for Complex Data Warehousing and Knowledge Discovery for Advanced Retrieval Development: Innovative Methods and Applications (Advances in Data Warehousing and Mining (Adwm) Book Series)
Next, we compute ordinal differentials hi+1 - hi until the page has been filled to capacity. We determine saturation by dynamically adjusting the minimal bit count δ required to represent the largest differential ρ in the running sequence. Once the capacity has been reached, the bit compacted indexes and their measures are written to a physical disk block. To illustrate the concept, Figure 8(b) displays H -1 Hilbert two 2-d points along the same simple Rtmp curve. The initial point represents the reference ordinal stored in the block header, while the second point is the ordinal corresponding to the next tuple.
Moreover, in the case of data warehouse schema evolution, other data modelling possibilities exist such as data warehouse versions that are also based on the above classical data warehouse models. Hence, the choice of data warehouse architecture is not neutral: it always has advantages and drawbacks and greatly influences the response time of decision-support queries. Once the architecture is selected, various optimization techniques such as indexing or materializing views further influence querying and refreshing performance.
The selection is based on cost models that evaluate the cost of accessing data using optimization structures (views, indices) and the cost of storing and maintaining these structures. The workload is supposed to represent the users’ demand on the data warehouse. , & Sellis, T. (2000). , & Saltarelli, E. (2003) argue that real workloads are much larger than those that can be handled by these techniques and thus view materialization and indexing success still depends on the experience of the designer.
Complex Data Warehousing and Knowledge Discovery for Advanced Retrieval Development: Innovative Methods and Applications (Advances in Data Warehousing and Mining (Adwm) Book Series) by Tho Manh Nguyen