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　　您好，盖老师，在这篇文章中
http://www.ixora.com.au/notes/lgwr_latching.htm

For incomplete copies above the sync RBA, LGWR just defers the writing of that block and subsequent log buffer blocks. For incomplete copies below the sync RBA, LGWR sleeps on a LGWR wait for redo copy wait event,
这段内容我不是很理解，above the sync RBA和below the sync RBA指的是什么？既然都需要等待copy latches 的释放，为什么当 incomplete copies above the sync RBA时，LGWR just defers the writing of that block and subsequent log buffer blocks？LGWR会有不同的处理办法

From: gaoshuangwu
2012.05.30 22:57