FAST_START_PARALLEL_ROLLBACK

Property	Description
Parameter type	String
Syntax	`FAST_START_PARALLEL_ROLLBACK = { HI \| LO \| FALSE }`
Default value	`LOW`
Modifiable	`ALTER SYSTEM`
Basic	No

FAST_START_PARALLEL_ROLLBACK specifies the degree of parallelism used when recovering terminated transactions. Terminated transactions are transactions that are active before a system failure. If a system fails when there are uncommitted parallel DML or DDL transactions, then you can speed up transaction recovery during startup by using this parameter.

Values:

FALSE

Parallel rollback is disabled
LOW

Limits the maximum degree of parallelism to 2 * CPU_COUNT
HIGH

Limits the maximum degree of parallelism to 4 * CPU_COUNT

If you change the value of this parameter, then transaction recovery will be stopped and restarted with the new implied degree of parallelisme.