Improved query performance with variant indexes
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Bitmap index design and evaluation
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
An efficient bitmap encoding scheme for selection queries
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Query optimization for selections using bitmaps
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
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This paper proposes, for query optimizing on Data warehouses, the use of range-encoded bitmap index to calculate aggregates. By using space optimal range-encoded bitmap index for range and aggregate predicates, the need of separate indexes for these operations can be eliminated. The proposed algorithm also uses the population ratio of 1's in a bitmap to decide whether the bitmap has to be scanned from the disk at all; thus exploiting the opportunity of skipping many bitmap scans since processing them does not affect the solution. These optimizations result in significant improvement in query evaluation time.