刘老师，您好
DB 11.2.0.3.0 Linux x86-64
GI 11.2.0.3.0 Linux x86-64
OS RHEL 5.5
2节点RAC
LGWR Trace文件中交替出现如下内容
*** 2012-11-26 09:16:52.063
Log file sync switching to polling
Current scheduling delay is 1 usec
Current approximate redo synch write rate is 1 per sec
kcrfw_update_adaptive_sync_mode: poll->post current_sched_delay=0 switch_sched_delay=1 current_sync_count_delta=0 switch_sync_count_delta=3
*** 2012-11-26 10:42:15.844
Log file sync switching to post/wait
Current approximate redo synch write rate is 0 per sec
kcrfw_update_adaptive_sync_mode: post->poll long#=1 sync#=3 sync=3404 poll=2930 rw=1465 rw+=1513 ack=0 min_sleep=1935
*** 2012-11-26 13:53:37.275
Log file sync switching to polling
Current scheduling delay is 1 usec
Current approximate redo synch write rate is 1 per sec
kcrfw_update_adaptive_sync_mode: poll->post current_sched_delay=0 switch_sched_delay=1 current_sync_count_delta=0 switch_sync_count_delta=3
什么含义？