Aggregate Tables 回复：scan-buffer-delta only

来源: newstoall 于 2009-06-05 04:22:31 [] [旧帖] [给我悄悄话] 阅读数 : (330 bytes)

你不用次次都从头走到尾巴
不是SQL专家的回答

Even you always need process from the head to the tail, you can pre-generate some aggregate tables to improve the performance.

Depending on how accurate you want, the aggregate tables can be generate at night and of course you need use aggregate awareness SQLs.

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