Linux AS5.3 , Oracle 10.2.0.4 RAC , 3 Nodes

Sat Feb 13 21:24:47 2010
Thread 1 advanced to log sequence 8714 (LGWR switch)
Current log# 26 seq# 8714 mem# 0: /ocfs_ctrl_redo/mxdell/redo26.log
Current log# 26 seq# 8714 mem# 1: /ocfs_data/mxdell/redo26.log
Sat Feb 13 21:27:28 2010
Thread 1 advanced to log sequence 8715 (LGWR switch)
Current log# 27 seq# 8715 mem# 0: /ocfs_ctrl_redo/mxdell/redo27.log
Current log# 27 seq# 8715 mem# 1: /ocfs_data/mxdell/redo27.log
Sat Feb 13 21:28:18 2010
SMON: Parallel transaction recovery tried
Sat Feb 13 21:31:32 2010
Thread 1 advanced to log sequence 8716 (LGWR switch)
Current log# 28 seq# 8716 mem# 0: /ocfs_ctrl_redo/mxdell/redo28.log
Current log# 28 seq# 8716 mem# 1: /ocfs_data/mxdell/redo28.log
Sat Feb 13 21:34:48 2010
Thread 1 advanced to log sequence 8717 (LGWR switch)
Current log# 30 seq# 8717 mem# 0: /ocfs_ctrl_redo/mxdell/redo30.log
Current log# 30 seq# 8717 mem# 1: /ocfs_data/mxdell/redo30.log
Sat Feb 13 21:36:45 2010
Thread 1 advanced to log sequence 8718 (LGWR switch)
Current log# 29 seq# 8718 mem# 0: /ocfs_ctrl_redo/mxdell/redo29.log
Current log# 29 seq# 8718 mem# 1: /ocfs_data/mxdell/redo29.log
Sat Feb 13 21:42:17 2010
Thread 1 advanced to log sequence 8719 (LGWR switch)
Current log# 25 seq# 8719 mem# 0: /ocfs_ctrl_redo/mxdell/redo25.log
Current log# 25 seq# 8719 mem# 1: /ocfs_data/mxdell/redo25.log

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檢檢視看兩個引數

fast_start_parallel_rollback --- 大事務失敗的時候 smon 決定是否啟動多個程式同時做roll ，可設定為 low 不啟動並行rolll
recovery_parallelism --- 資料庫恢復的時候決定是否使用多個程式，可設定為0

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$ ps -ef | grep ora_ 檢視process

SMON: Parallel transaction recovery tried

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