计算统计的意义 在上节的例子中,a n a l y z e命令的compute statistics(计算统计)选项用于收集对象的统计信 息。O r a c l e还提供一个estimate statistics选项;缺省时,在分析过程中将只扫描表的前1 0 6 4行。
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The contents of the cache can be used to compute statistics, which in turn can be used to precompute pages that users are likely to request during their sessions.
缓存的内容可用于统计计算,这反过来又可用来预先生成用户在会话期间可能会请求的页面。
The instrumented code can collect complete application traces, enabling us to compute statistics for latency and throughput and to perform application diagnostics.
测量代码(Instrumented code)能收集完整的应用轨迹,帮助我们计算剩余量(Latency)和生产量(Throughput)的状态,执行应用诊断等。
The optimizer can then compare the input variable values to catalog statistics and compute a better selectivity estimate for predicates.
然后,优化器可以将输入变量的值与编目统计进行比较,并为谓词计算出一个更好的选择估计。
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