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_DIMENSIONS
describes dimension tables associated with all tables with an attribute clustering clause in the database. -
USER_CLUSTERING_DIMENSIONS
describes dimension tables associated with tables with an attribute clustering clause owned by the user. This view does not display theOWNER
column.
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 TABLE
section in Oracle Database SQL
Language Reference for information about using theCLUSTERING
clause to create an attribute clustering table -
The
CREATE TABLE
section in Oracle Database SQL
Language Reference for information about using theCLUSTERING
clause to create an attribute clustering table -
Oracle Database Data
Warehousing Guide for information about dimension tables -
Oracle Database Data
Warehousing Guide for information about attribute clustering with zone maps