• The index rows will not be in LASTNAME order within DEPTNO A01.

    DEPTNO A01中,索引行将LASTNAME顺序排列。

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  • And we also started by creating an index on the EMPNO and DEPTNO columns.

    我们创建关于EMPNOdeptno索引开始

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  • LASTNAME is in random order within each DEPTNO, but like values are contiguous.

    LASTNAME每个DEPTNO随机顺序排列,like连续的。

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  • In this case, there are two column groups: (deptno, deptname) and (admrdept, location).

    例中,总共两个:(deptno,deptname)(admrdept,location)。

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  • Under the Result Attributes tab, deselect all attributes except "deptname" and "deptno."

    标签ResultAttributes之下取消deptnamedeptno”之外所有属性的选择。

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  • Example 18: Collect catalog statistics on all indexes and on columns deptno and deptname.

    示例18收集所有索引以及deptnodeptname上的目录统计信息。

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  • On the primary key Tasks page, select deptno as the primary key for the Department entity.

    主要关键Tasks页面中,选择deptno以作为Department实体主要关键字。

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  • The num_freqvalues and num_quantiles values for the deptno column will be obtained from the default.

    deptnonum _ freqvaluesnum _ quantiles默认中获得

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  • Therefore, using control break logic, DB2 can return distinct DEPTNO, LASTNAME combinations without sorting.

    因此使用控制断开逻辑DB2可以返回不同DEPTNOLASTNAME组合无需排序

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  • Example 16: Collect catalog statistics on table, with distribution statistics on columns deptno and deptname.

    示例16收集目录统计信息,包含deptnodeptname上的分布统计信息。

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  • Our index is in DEPTNO order, and within that order, in groups of identical (but unordered) values of LASTNAME.

    我们索引DEPTNO顺序的,顺序相等无序)的LASTNAME分为一个小组

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  • We can match on one column, and if we use the index the traditional way, the data will come back in DEPTNO order.

    我们可以进行匹配如果我们以传统方式使用索引数据DEPTNO顺序返回

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  • The WORKDEPT field of the EMPLOYEE table obviously pointed to the DEPARTMENT table, using the DEPTNO field to link to.

    EMPLOYEEWORKDEPT字段显然指向DEPARTMENT 表,使用DEPTNO 字段可以链接该表。

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  • Distribution statistics limits are set individually for the deptname column, while deptno column USES a common default.

    单独deptname设置分布统计信息范围deptno使用公共默认值

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  • Columns in the existing indexes: If an index already exists on EMPNO or DEPTNO, it might not be wise to create another index on the combination.

    现有索引中的如果EMPNODEPTNO已经有了索引那么创建另一个关于该组合的索引也许并不明智

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  • Example 12: Collect catalog statistics on only the table, with basic column statistics for deptno and deptname and distribution statistics on mgrno and admrdept.

    示例12收集目录统计信息,包含deptnodeptname上的基本统计信息以及mgrnoadmrdept上的分布统计信息。

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  • And DEPTNO should be listed second, allowing DB2 to do a direct index lookup on the first column (EMPNO) and then a scan on the second (DEPTNO) for the greater-than.

    然后列出DEPTNO从而允许DB 2第一(EMPNO)执行直接索引查找,然后针对大于号扫描第二列(DEPTNO)。

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  • The runtime will determine the parameters to an SQL operation (such as the deptno in the example) and also analyze metadata of the SQL resultset to create the right XML output types.

    运行时确定一个SQL操作参数(比如中的deptno)并且分析SQL结果集元数据创建正确XML输出类型。

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  • Furthermore, if indexes already exist for both columns (one for EMPNO and one for DEPTNO), DB2 can use them both to satisfy this query so creating another index might not be necessary.

    而且如果已经存在关于这两索引(关于EMPNO,一个关于DEPTNO),DB 2可以使用它们满足查询因此创建另一个索引也许是没有必要的。

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  • Furthermore, if indexes already exist for both columns (one for EMPNO and one for DEPTNO), DB2 can use them both to satisfy this query so creating another index might not be necessary.

    而且如果已经存在关于这两索引(关于EMPNO,一个关于DEPTNO),DB 2可以使用它们满足查询因此创建另一个索引也许是没有必要的。

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