V$ROLLNAME

V$ROLLNAME lists the names of all online rollback segments. It can only be accessed when the database is open.

Column Datatype NULL Description

USN NUMBER Rollback (undo) segment number

NAME VARCHAR2(30) NOT NULL Rollback segment name

Column	Datatype	NULL	Description
`USN`	`NUMBER`		Rollback (undo) segment number
`NAME`	`VARCHAR2(30)`	`NOT NULL`	Rollback segment name
`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 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

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 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