Since the queries are dynamic, with unknown selection criteria at compile time, plan generation can be incorrect, even with the availability of full distribution statistics on the data.
由于查询是动态的,在编译时并不知道其选择标准,因此,即使有了关于数据的完整的分布统计,仍然可能生成错误的计划。
Since the queries are dynamic, with unknown selection criteria at compile time, plan generation can be incorrect, even with the availability of full distribution statistics on the data.
由于查询是动态的,在编译时并不知道其选择标准,因此,即使有了关于数据的完整的分布统计,仍然可能生成错误的计划。
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