V$BACKUP_CONTROLFILE_DETAILS

V$BACKUP_CONTROLFILE_DETAILS contains information about restorable control files. It will include all the control files backed up in the backup set, image copies, and proxy copies.

Column	Datatype	Description
`BTYPE`	`CHAR(9)`	Backup type container. Possible values are `BACKUPSET`, `IMAGECOPY`, `PROXYCOPY`.
`BTYPE_KEY`	`NUMBER`	Unique identifier for the backup type, either `BS_KEY` or `COPY_KEY`.
`SESSION_KEY`	`NUMBER`	Session identifier
`SESSION_RECID`	`NUMBER`	Session recid
`SESSION_STAMP`	`NUMBER`	Session stamp
`ID1`	`NUMBER`	If `BACKUPSET`, it contains `SET_STAMP` If `IMAGECOPY` or `PROXYCOPY`, it is `RECID` from the control file
`ID2`	`NUMBER`	If `BACKUPSET`, it contains `SET_COUNT` If `IMAGECOPY` or `PROXYCOPY`, it is `STAMP`
`CREATION_TIME`	`DATE`	File creation time
`RESETLOGS_CHANGE#`	`NUMBER`	Resetlogs change SCN
`RESETLOGS_TIME`	`DATE`	Resetlogs change time
`CHECKPOINT_CHANGE#`	`NUMBER`	Checkpoint change SCN
`CHECKPOINT_TIME`	`DATE`	Checkpoint change time
`FILESIZE`	`NUMBER`	File size, in bytes, for the output of backing up this control file
`COMPRESSION_RATIO`	`NUMBER`	The ratio between the total blocks in the datafile and the blocks that RMAN backed up. This is not the the ratio from the `AS COMPRESSED BACKUPSET` clause of the `BACKUP` command.
`FILESIZE_DISPLAY`	`VARCHAR2(4000)`	Same value as the `FILESIZE` column, but converted to a user-displayable format, for example `n`M, `n`G, `n`T, `n`P, and so on