V$INDEXED_FIXED_COLUMN

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(30)`	Name of the dynamic performance table that is indexed
`INDEX_NUMBER`	`NUMBER`	Number that distinguishes to which index a column belongs
`COLUMN_NAME`	`VARCHAR2(30)`	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)