Oracle 视图 ALL_CLUSTERING_DIMENSIONS 官方解释,作用,如何使用详细说明
本站中文解释
ALL_CLUSTERING_DIMENSIONS 是 Oracle 中的一个内置视图,其提供了所有用户定义的多维聚类(MDC)数据库实例中使用的维护维度和重叠维护维度(OMD)的信息。
该视图中所列出的所有维度都是可作为MDC目标表(包括表段和子分区)的构成部分,每个维度可由多个分量组成。
使用这个视图可以获取当前实例的维度的详细信息,例如:维度名称、更新时间、分量数、分量名称和类型、分量表名称、分量表所涉及的列名称等。另外,可以使用此视图来检查当前实例中是否存在多少个维度,以及每个维度中有多少个分量,以及每个分量所属的表名称。这可以有助于保证MDC实现的准确性和可靠性。
官方英文解释
ALL_CLUSTERING_DIMENSIONS describes dimension tables associated with tables with an attribute clustering clause that the user owns or has system privileges for.
Related Views
DBA_CLUSTERING_DIMENSIONSdescribes dimension tables associated with all tables with an attribute clustering clause in the database.USER_CLUSTERING_DIMENSIONSdescribes dimension tables associated with tables with an attribute clustering clause owned by the user. This view does not display theOWNERcolumn.
| Column | Datatype | NULL | Description |
|---|---|---|---|
|
|
| Owner of the attribute clustering table |
|
|
| Name of the attribute clustering table |
|
|
| Owner of the dimension table |
|
|
| Name of the dimension table |
See Also:
“DBA_CLUSTERING_DIMENSIONS”
“USER_CLUSTERING_DIMENSIONS”
The
ALTER TABLEsection in Oracle Database SQL
Language Reference for information about using theCLUSTERINGclause to create an attribute clustering tableThe
CREATE TABLEsection in Oracle Database SQL
Language Reference for information about using theCLUSTERINGclause to create an attribute clustering tableOracle Database Data
Warehousing Guide for information about dimension tablesOracle Database Data
Warehousing Guide for information about attribute clustering with zone maps
