DBA_ROLLBACK_SEGS

DBA_ROLLBACK_SEGS describes rollback segments.

Column	Datatype	NULL	Description
`SEGMENT_NAME`	`VARCHAR2(30)`	`NOT NULL`	Name of the rollback segment
`OWNER`	`VARCHAR2(6)`		Owner of the rollback segment: `PUBLIC` `SYS`
`TABLESPACE_NAME`	`VARCHAR2(30)`	`NOT NULL`	Name of the tablespace containing the rollback segment
`SEGMENT_ID`	`NUMBER`	`NOT NULL`	ID number of the rollback segment
`FILE_ID`	`NUMBER`	`NOT NULL`	File identifier number of the file containing the segment head
`BLOCK_ID`	`NUMBER`	`NOT NULL`	ID number of the block containing the segment header
`INITIAL_EXTENT`	`NUMBER`		Initial extent size in bytes
`NEXT_EXTENT`	`NUMBER`		Secondary extent size in bytes
`MIN_EXTENTS`	`NUMBER`	`NOT NULL`	Minimum number of extents
`MAX_EXTENTS`	`NUMBER`	`NOT NULL`	Maximum number of extent
`PCT_INCREASE`	`NUMBER`		Percent increase for extent size
`STATUS`	`VARCHAR2(16)`		Rollback segment status: `OFFLINE` `ONLINE` `NEEDS RECOVERY` `PARTLY AVAILABLE` `UNDEFINED`
`INSTANCE_NUM`	`VARCHAR2(40)`		Rollback segment owning Oracle Real Application Clusters instance number
`RELATIVE_FNO`	`NUMBER`	`NOT NULL`	Relative file number of the segment header