The optimizer is equivalent in function to an expert system.
优化器在功能上等价于一个专家系统。
You can create, save, and reuse external optimizer directives.
可以创建、保存和重用外部优化器指令。
The total number of rows, estimated by the optimizer, is2.176.
优化器估计的总行数是2。176。
The optimizer does not consider join orders that violate this rule.
如果违背这一原则, 优化器就不会再考虑连接顺序。
Selectivity Estimation is the base of spatial database query optimizer.
选择性估计是设计空间数据库查询优化器得基础。
The optimizer uses its value to determine its choice of the data access method.
优化器用其值来选择数据访问方法。
The optimizer will compare the cost of each method to determine the best one to use.
优化器将比较每种方法的成本，确定使用最好的一种。
The optimizer bases query cost estimates on the number of rows to be retrieved from each table.
优化器将根据在每个表中检索的行数来评估查询成本。
Indicates that column statistics which would have been useful to the optimizer are not present.
表明不存在可能对优化器有用得列统计。
The query optimizer, in consultation with the wrapper, determines how the data is to be accessed.
查询优化器与包装器一道决定如何访问数据。
Indicates that column statistics which would have been useful to the query optimizer are not present.
表明不存在可能对查询优化器有用得列统计。
The optimizer will deduce key value selection based on the functional dependency of the column within the row.
优化器将根据行中列的函数依赖性来推断关键值选择。
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