1.307 ROLLBACK_SEGMENTS
ROLLBACK_SEGMENTS
allocates one or more rollback segments by name to this instance.
Property | Description |
---|---|
Parameter type |
String |
Syntax |
|
Default value |
If you do not specify this parameter, the instance uses public rollback segments by default, unless the |
Modifiable |
No |
Modifiable in a PDB |
Yes |
Range of values |
Any rollback segment names listed in |
Basic |
No |
Oracle RAC |
Multiple instances must have different values. |
If you set this parameter, the instance acquires all of the rollback segments named in this parameter, even if the number of rollback segments exceeds the minimum number required by the instance (calculated as TRANSACTIONS / TRANSACTIONS_PER_ROLLBACK_SEGMENT
).
You cannot change the value of this parameter dynamically, but you can change its value and then restart the instance. Although this parameter usually specifies private rollback segments, it can also specify public rollback segments if they are not already in use.
To find the name, segment ID number, and status of each rollback segment in the database, query the data dictionary view DBA_ROLLBACK_SEGS
.
When UNDO_MANAGEMENT
is set to AUTO
, ROLLBACK_SEGMENTS
is ignored.
See Also:
-
Oracle Real Application Clusters Administration and Deployment Guide for information on setting this parameter in an Oracle RAC environment