Managing sparsity in an multidimensional data structure
First Claim
1. A computer-implemented method comprising:
- determining a set of dimensions within a relational database to be stored in a cache, the set of dimensions having a historical access frequency meeting a pre-defined cardinality threshold of data-containing cells;
responsive to determining the set of dimensions, restricting an initial load to a size below a threshold size by causing a multidimensional database management system to generate the initial load using only the set of dimensions having a historical access frequency meeting a pre-defined cardinality threshold of data-containing cells;
at predetermined time intervals, retrieving log files including usage information for individual dimensions in the set of dimensions stored in a cache and in uncached dimensions stored in a relational database, the usage information corresponding to a level of usage of the individual dimensions;
at the predetermined time intervals, determining at least one relatively high usage dimension in the uncached dimensions based, at least in part, upon the usage information; and
at the predetermined time intervals, causing the multidimensional database management system to refresh, in a memory device, the initial load using only a portion of the set of dimensions and the at least one relatively high usage dimension in the uncached dimensions from the usage information in the log files, the refreshing action generating an incremental load to be stored in the cache.
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Abstract
Embodiments of the present invention relate to a method, program product, and system for managing the percentage of unpopulated cells in a multidimensional data structure during the servicing of multidimensional analytical queries. In an embodiment, a multidimensional data structure is stored in a memory location of a computing device, wherein the multidimensional data structure includes a dimension that is a subset of a plurality of dimensions included in a relational database. The computing device determines a frequency of utilization of a dimension to service a multidimensional query request. The computing device combines the dimension with the multidimensional data structure responsive to the frequency of utilization.
49 Citations
6 Claims
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1. A computer-implemented method comprising:
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determining a set of dimensions within a relational database to be stored in a cache, the set of dimensions having a historical access frequency meeting a pre-defined cardinality threshold of data-containing cells; responsive to determining the set of dimensions, restricting an initial load to a size below a threshold size by causing a multidimensional database management system to generate the initial load using only the set of dimensions having a historical access frequency meeting a pre-defined cardinality threshold of data-containing cells; at predetermined time intervals, retrieving log files including usage information for individual dimensions in the set of dimensions stored in a cache and in uncached dimensions stored in a relational database, the usage information corresponding to a level of usage of the individual dimensions; at the predetermined time intervals, determining at least one relatively high usage dimension in the uncached dimensions based, at least in part, upon the usage information; and at the predetermined time intervals, causing the multidimensional database management system to refresh, in a memory device, the initial load using only a portion of the set of dimensions and the at least one relatively high usage dimension in the uncached dimensions from the usage information in the log files, the refreshing action generating an incremental load to be stored in the cache. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification