V$MAP_FILE_EXTENT

V$MAP_FILE_EXTENT contains a list of all file extent mapping structures in the shared memory of the instance.

Column	Datatype	Description
`FILE_MAP_IDX`	`NUMBER`	File index (corresponds to `FILE_MAP_IDX` in `V$MAP_FILE`)
`EXT_NUM`	`NUMBER`	File extent number
`EXT_ELEM_OFF`	`NUMBER`	Element offset in HKB
`EXT_SIZE`	`NUMBER`	File extent size in HKB
`EXT_FILE_OFF`	`NUMBER`	File Offset in HKB
`EXT_TYPE`	`VARCHAR2(6)`	File Extent Type (`DATA`, `PARITY`, or `NONE`)
`ELEM_IDX`	`NUMBER`	Index in `V$MAP_ELEMENT` corresponding to the element where the file extent resides