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参数FAST_START_PARALLEL_ROLLBACK

原创 Linux操作系统 作者:zwunixdb 时间:2013-11-01 08:06:12 0 删除 编辑
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 determines the maximum number of processes that can exist for performing parallel rollback. This parameter is useful on systems in which some or all of the transactions are long running.

Values:

  • FALSE indicates that parallel rollback is disabled

  • LOW limits the number of rollback processes to 2 * CPU_COUNT

  • HIGH limits the number of rollback processes to 4 * CPU_COUNT

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