Maintenance of materialized outer-join views
Maintenance of materialized view for query optimization in a database. The architecture provides the first practical algorithms for incrementally maintaining views with multiple outer joins and aggregated outer-join views. Materialized views with any combination of inner joins, one-sided outer joins...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
16.12.2008
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| Online Access | Get full text |
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| Summary: | Maintenance of materialized view for query optimization in a database. The architecture provides the first practical algorithms for incrementally maintaining views with multiple outer joins and aggregated outer-join views. Materialized views with any combination of inner joins, one-sided outer joins and full outer joins, plus an optional aggregation on top, can be processed by algorithm(s) that construct incremental maintenance expressions based on converting the view definition a join-disjunctive normal form and exploiting database constraints to reduce maintenance overhead. A system comprises a view creation component for creating a materialized view definition that includes outer-joins, a conversion component for converting an outer-join view expression into a normal form, and a maintenance component for updating the stored materialized view result associated with the materialized view definition. |
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