1. Database Reference
  2. Initialization Parameters
  3. Initialization Parameters
  4. UNDO_MANAGEMENT

1.344 UNDO_MANAGEMENT

UNDO_MANAGEMENT specifies which undo space management mode the system should use.

Property Description

Parameter type

String

Syntax

UNDO_MANAGEMENT = { MANUAL | AUTO }

Default value

AUTO

Modifiable

No

Modifiable in a PDB

Yes

Basic

No

Oracle RAC

Multiple instances must have the same value.

When UNDO_MANAGEMENT is set to AUTO, the instance starts in automatic undo management mode. In manual undo management mode, undo space is allocated externally as rollback segments.

Note:

In a CDB, the UNDO_MANAGEMENT initialization parameter must be set to AUTO, and an undo tablespace is required to be created to manage the undo data.

See Also: