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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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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
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