Oracle in a Nutshell

Name

CREATE/ALTER/DROP ROLLBACK SEGMENT

Synopsis

CREATE Syntax:

CREATE [PUBLIC] ROLLBACK SEGMENT segment_name 
TABLESPACE tablespace_name 
 [Storage_Clause]

ALTER Syntax:

ALTER ROLLBACK SEGMENT segment_name 
[Storage_Clause]
[ONLINE | OFFLINE] 
[SHRINK]

DROP Syntax:

DROP ROLLBACK SEGMENT segment_name

Creates, modifies, or removes a rollback segment, which Oracle uses to store data necessary to roll back changes made by transactions.

Tip

When a rollback segment is created, it will be offline. It must be brought online by using the ALTER ROLLBACK SEGMENT statement or by restarting the database with the rollback segment named in the initialization file.

Keywords

PUBLIC

Specifies that this rollback segment is available to any instance. If omitted, it is available only to the instance naming it in the ROLLBACK_SEGMENTS parameter in the initialization file.

segment_name

Name of the rollback segment to be created.

TABLESPACE

Specifies the name of the tablespace in which this rollback segment will be created.

ONLINE

Specifies that the named rollback segment be brought online.

OFFLINE

Specifies that the named rollback segment be taken offline.

SHRINK

Specifies that the named rollback segment should be reduced to the size specified or to the OPTIMAL size if no size is specified.

Common keywords and clauses: Storage_Clause, tablespace_name.