• 不能查询中使用一个外部

    You cannot use an external table in a sub-query.

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  • 不能查询使用多个外部

    You cannot use multiple external tables in the main query.

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  • 使用以下ddl创建一个外部

    Create an external table using the following DDL.

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  • 外部可以采用以下三种方法创建

    An external table can be created using one of the following three methods.

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  • 注意外部以下使用限制

    Be aware of the following restrictions on the use of external tables.

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  • 不能外部定义触发器

    You cannot define triggers for external tables.

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  • 使用以下查询创建外部

    Create the external table using the following query.

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  • 一行现在可以通过外部成功访问

    This row can now be successfully accessed through an external table.

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  • 外部数据文件不能进行任何形式复制

    External table data files are excluded from all forms of replication.

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  • 使用清单11中的查询选择外部中的行

    Select the rows from the external table using the query in Listing 11.

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  • 处理外部中的内置opaque数据类型

    Manipulating built-in opaque data types in external tables.

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  • 不能改变外部模式

    You cannot alter the external table schema.

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  • 而且外部选择可以获得准备得以执行

    Also, the selection from the external table can be prepared and executed.

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  • 没有外部远程视图派生

    No table is an external table, remote table, view, or derived table.

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  • NUMROWS外部可能拥有大致

    NUMROWS: the approximate number of rows that the external table can possibly have.

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  • LBAC安全性不能施加外部数据文件上。

    LBAC security cannot be imposed on external table data files.

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  • 这些外部关联数据文件不会受到任何更改

    The data files associated with the external tables will not undergo any changes.

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  • 由于载入日志外部数据文件不能进行复制

    Because they are not logged, the external table data files are excluded from all the replications.

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  • 用例5采用使用动态sql外部存储过程

    Case 5: Having stored procedure using dynamic SQL and external tables.

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  • 外部不能merge语句中的目标

    An external table cannot be a target table in the MERGE statement.

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  • 根据更好元数据定义减少返回数据(使用外部)。

    Reduction of return data based on better definition of metadata (using External tables).

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  • 服务器主服务器允许外部上的所有受支持操作

    Primary: all supported operations on external tables are allowed on the primary server.

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  • 指定之外,外部创建包含一个using子句。

    Creation of external tables also includes a USING clause in addition to the column specification.

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  • NUMROWS用于提供一个外部可能拥有大致行数

    NUMROWS is used to provide an approximate number of rows that an external table can have.

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  • 为了进行比较创建一个带有 NUMROWS 的外部

    To compare, create an external table with NUMROWS

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  • 通过索引扫描还是扫描访问外部则取决于

    The outer table can be accessed by an index scan or by a table scan, depending on the table.

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  • 使用外部时要获得最佳结果请遵循以下最佳实践

    For the best results with external tables, follow these practices.

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  • IDS服务器引入外部满足了这个需求并且改善性能

    The introduction of external tables within the IDS server fulfils the requirement and provides better performance.

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  • 不能针对一个外部运行updateSTATISTICS

    You cannot run UPDATE STATISTICS against an external table.

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  • 外部驻留底层操作系统中的数据文件提供一个普通界面

    External tables provide a normal table interface to data files that reside in the underlying operating system.

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