Incremental checkpoint up to RBA

Incremental checkpoint up to RBA [0x22.2ea99.0], current log tail at RBA [0x22.303db.0]
Mon Jan 14 09:45:29 2013
Incremental checkpoint up to RBA [0x22.34d44.0], current log tail at RBA [0x22.37317.0]
Mon Jan 14 10:05:30 2013
Incremental checkpoint up to RBA [0x22.3b103.0], current log tail at RBA [0x22.3d743.0]
Mon Jan 14 10:25:31 2013
Incremental checkpoint up to RBA [0x22.43834.0], current log tail at RBA [0x22.44d4f.0]
Mon Jan 14 10:45:32 2013
Incremental checkpoint up to RBA [0x22.48a38.0], current log tail at RBA [0x22.4a6bc.0]
Mon Jan 14 11:05:33 2013
Incremental checkpoint up to RBA [0x22.4dd7b.0], current log tail at RBA [0x22.4fe2e.0]
Mon Jan 14 11:25:34 2013
Incremental checkpoint up to RBA [0x22.544d2.0], current log tail at RBA [0x22.575dd.0]
Mon Jan 14 11:45:36 2013
Incremental checkpoint up to RBA [0x22.5984f.0], current log tail at RBA [0x22.5a1c8.0]
Mon Jan 14 12:05:37 2013
Incremental checkpoint up to RBA [0x22.5d470.0], current log tail at RBA [0x22.63e39.0]
Mon Jan 14 12:25:38 2013
Incremental checkpoint up to RBA [0x22.660e7.0], current log tail at RBA [0x22.669c0.0]
Mon Jan 14 12:45:39 2013
Incremental checkpoint up to RBA [0x22.69788.0], current log tail at RBA [0x22.6a22b.0]
Mon Jan 14 13:05:40 2013
Incremental checkpoint up to RBA [0x22.6e8cd.0], current log tail at RBA [0x22.70a61.0]
Mon Jan 14 13:25:42 2013
Incremental checkpoint up to RBA [0x22.758ac.0], current log tail at RBA [0x22.76d6d.0]
Mon Jan 14 13:45:43 2013
Incremental checkpoint up to RBA [0x22.79c97.0], current log tail at RBA [0x22.7a932.0]
Mon Jan 14 14:05:44 2013
Incremental checkpoint up to RBA [0x22.7ddc4.0], current log tail at RBA [0x22.808c3.0]
Mon Jan 14 14:25:45 2013
Incremental checkpoint up to RBA [0x22.84c25.0], current log tail at RBA [0x22.868a9.0]
Mon Jan 14 14:45:46 2013
Incremental checkpoint up to RBA [0x22.8aa69.0], current log tail at RBA [0x22.8b846.0]
Mon Jan 14 15:05:47 2013
Incremental checkpoint up to RBA [0x22.8e9f8.0], current log tail at RBA [0x22.9019d.0]
Mon Jan 14 15:25:48 2013
Incremental checkpoint up to RBA [0x22.93a26.0], current log tail at RBA [0x22.95428.0]
Mon Jan 14 15:45:49 2013
Incremental checkpoint up to RBA [0x22.9b077.0], current log tail at RBA [0x22.9bb2d.0]

SQL> show parameter log_checkpoint
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_checkpoint_interval              integer     100000
log_checkpoint_timeout               integer     1200
log_checkpoints_to_alert             boolean     TRUE
Oracle EBS数据库alert出现这么多checkpoint的日志信息，与log_checkpoints_to_alert设置有关。