• In simple terms, fragment-level statistics allows storage of column data distributions per fragment, and building the table level from its constituent fragments.

    简单来说片段统计允许片段存储数据分布组成片段构建级别

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  • After completing Step 1, by default all the subunits in the subunits list table will be converted to fragments.

    完成步骤1之后,默认条件下子单元列表中的所有子单元都会转化为片段。

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  • If the table has fragment-level statistics, the decision to refresh statistics is done at the fragment level, thereby rebuilding statistics only for changed or new fragments.

    如果具有片段统计,那么将片段层面上判断是否执行统计刷新因此只有片段被修改出现片段的情况下重建统计。

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  • Note that the XML document fragment in Table 1 matches all three schema fragments in Table 1, Listing 9, and Listing 10.

    注意1中的XML文档片段与表1、清单9清单10三个模式片段匹配

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  • Specifying a table name results in all fragments of that table being defragmented.

    指定一个导致该表中的所有片段整理。

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  • The DBA does not have to create all the possible fragments for a table up front.

    DBA 无需当前表格创建所有可能的片段

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  • Notice that data from all fragments is sorted together to form table level statistics, which is encoded and stored in the system catalog sysdistrib.

    注意来自所有片段数据一同存储形成级别统计数据被编码存储系统目录sysdistrib中

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  • Finally table level statistics is formed by merging all constituent fragments statistics and stored in sysdistrib.

    最终,将所有这些片段统计合并起来就构成了统计数据,存储sysdistrib。

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  • Storing multiple table or index fragments in a single dbspace improves query performance over storing each fragmented expression in a different dbspace.

    单个dbspace保存多个索引片段提高了查询性能,这样做胜过将每个分段表达式存储不同的dbspace中。

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  • Before attaching fragments place the table in alter mode.

    附加片段之前,要先置于alter模式之下。

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  • You can store multiple fragments of the same table or index in a single dbspace, reducing the total number of dbspaces needed for a fragmented table.

    单个dbspace可以存储同一个索引多个片段从而减少分段表所需要dbspace总体数量

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  • The command in Listing 4 creates a table called tab_list that fragments data based on column state using list fragmentation.

    清单4中的命令使用清单存储残片根据状态创建了一个名为tab_list的表格

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  • The command in Listing 5 creates a table called tab_interval that fragments data on column id using interval fragmentation.

    清单5中的命令创建了一个名为tab_interval的表格,它使用区间存储残片分隔id数据

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  • The following table gives the size of minibin for each datatype with a combination of resolution and number of fragments.

    给出每种数据类型迷你箱状图的大小,同时还给出了解析率片段数。

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  • The table has three initial fragments: p0, p1, and p2.

    表格三个初期片段p 0, p1p2

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  • Mark all index fragments of all bitmap indexes defined on the table UNUSABLE and rebuild them once the operation is complete.

    那么得先找出这个有哪些索引,哪些索引位图索引,怎么查呢?

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  • Mark all index fragments of all bitmap indexes defined on the table UNUSABLE and rebuild them once the operation is complete.

    那么得先找出这个有哪些索引,哪些索引位图索引,怎么查呢?

    youdao

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