| Property | Description |
|---|---|
| Parameter type | String |
| Syntax | UNDO_MANAGEMENT = { MANUAL | AUTO } |
| Default value | AUTO |
| Modifiable | No |
| Basic | No |
| Oracle RAC | Multiple instances must have the same value. |
UNDO_MANAGEMENT specifies which undo space management mode the system should use. When set to AUTO, the instance starts in automatic undo management mode. In manual undo management mode, undo space is allocated externally as rollback segments.