Oracle教程 2023-02-24

Oracle 视图 V$INDEXED_FIXED_COLUMN 官方解释，作用，如何使用详细说明

view

Oracle视图V$INDEXED_FIXED_COLUMN是V$FIXED_COLUMN视图的子视图，其展示了索引和非索引字段之间的关系。通过该视图可以获取一个表中索引字段是否必须作为可固定列，或者是可选固定列。

使用V$INDEXED_FIXED_COLUMN查看某表字段索引情况：

SELECT index_name,is_optional
FROM v$indexed_fixed_column
WHERE segment_name = ‘TABLE_NAME’;

V$INDEXED_FIXED_COLUMN displays the columns in dynamic performance tables that are indexed (X$ tables).

The X$ tables can change without notice. Use this view only to write queries against fixed views (V$ views) more efficiently.

Column	Datatype	Description
`TABLE_NAME`	`VARCHAR2(128)`	Name of the dynamic performance table that is indexed
`INDEX_NUMBER`	`NUMBER`	Number that distinguishes to which index a column belongs
`COLUMN_NAME`	`VARCHAR2(128)`	Name of the column that is being indexed
`COLUMN_POSITION`	`NUMBER`	Position of the column in the index key (this is mostly relevant for multicolumn indexes)
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. Possible values include: `0`: This value is used for rows containing data that pertain to the entire multitenant container database (CDB). This value is also used for rows in non-CDBs. `1`: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data

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