1.120 FAST_START_PARALLEL_ROLLBACK

FAST_START_PARALLEL_ROLLBACK specifies the degree of parallelism used when recovering terminated transactions.

Property Description

Parameter type

String

Syntax

FAST_START_PARALLEL_ROLLBACK = { HIGH | LOW | FALSE }

Default value

LOW

Modifiable

ALTER SYSTEM

Modifiable in a PDB

No

Basic

No

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 parallelism.

See Also:

Oracle Database VLDB and Partitioning Guide for more information about this parameter