The query optimizer USES the SYSSTAT catalog views in the database to retrieve the statistical information of the database objects and determine the best way to access the data.
查询优化器使用数据库中的SYSSTAT目录视图来检索数据库对象的统计信息,并确定访问数据库的最佳方法。
In addition to the easy-to-read formatting, you also have access to annotation that provides critical statistical information to facilitate your analysis of SQL performance.
除了方便阅读格式化,您还可以访问提供了关键统计信息的注释以便于您的SQL性能的分析。
On a negative note, you discovered that PHP has no native access to sampling distributions, which is a requirement for implementing most statistical tests.
不利的一面,您发现 PHP 对于取样分布缺乏内在手段,而这是实现大多数统计测试所必需的。
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