Accurately Speaking 准确来说 ; 准确地讲 ; 准确地说 ; 确切地讲 enquire accurately 广泛的研究 ; 认真思考 ; 查询准确 ; 认真练习 accurately observe 正观见 ..
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Study extensively;enquire accurately;reflect carefully;discriminate clearly;practise earnestly!!! » 广泛研究;查询准确;认真思考;明确歧视;实践认真! !
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...快 Study extensively;enquire accurately;reflect carefully;discriminate clearly;practise earnestly!!! » 广泛研究;查询准确;认真思考;明确歧视;实践认真! !
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Study extensively;enquire accurately;reflect carefully;discriminate clearly;practise earnestly!!! » 广泛研究;查询准确;认真思考;明确歧视;实践认真! !
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准确的索引信息和统计信息是查询优化器中基于成本的决策的基础。
Accurate index information and statistics are fundamental to cost-based decisions in the query optimizer.
本文的使用查询注释的案例研究部分描述了如何确定估计是否准确。
The a case study using query annotation section of the article describes how you can determine if the estimate is accurate.
因此，如果统计数据不准确或者过期，或者冲突，优化器会对查询计划中各步骤的成本评估不准确，从而导致糟糕的性能。
Consequently, if the statistics are inaccurate, outdated, or conflicting, the optimizer will create inaccurate estimates for the costs of the steps in a query plan, leading to poor performance.
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