发明名称 |
Partial pre-aggregation in relational database queries |
摘要 |
A partial pre-aggregation database operation improves processing efficiency of database queries by reducing the number of records input into a subsequent database operation, provided the query includes a final aggregation. A query optimizer is provided to determine when it is economical to partially pre-aggregate data records and when it is not. The partial pre-aggregation creates a record store in memory as input records are received. The record store is then used by another database operator, which saves the other database operator from having to re-create the record store.
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申请公布号 |
US2005240556(A1) |
申请公布日期 |
2005.10.27 |
申请号 |
US20050082392 |
申请日期 |
2005.03.17 |
申请人 |
MICROSOFT CORPORATION |
发明人 |
LARSON PER-AKE;GALINDO-LEGARIA CESAR A. |
分类号 |
G06F7/00;(IPC1-7):G06F7/00 |
主分类号 |
G06F7/00 |
代理机构 |
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主权项 |
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地址 |
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