关于SCN HEADROOM 和_external_scn_rejection_threshold_hours 的说明

简介: 1、headroom 可以理解为一个时刻 SCN能够达到的最大值,其随时间的增加而增大 2、关于DBLINK SCN传播会选择更高的SCN进行同步 3、_external_scn_rejection_threshold_hours和HEADROOM的关...
1、headroom 可以理解为一个时刻 SCN能够达到的最大值,其随时间的增加而增大
2、关于DBLINK SCN传播会选择更高的SCN进行同步
3、_external_scn_rejection_threshold_hours和HEADROOM的关系如下:
 headroom-同步过来高SCN>_external_scn_rejection_threshold_hours 接受 反则报错 

记录一下备忘

参考http://www.csdn123.com/html/itweb/20130819/67929_67932_67942.htm
http://www.oracledatabase12g.com/archives/scn-headroom-1988-oracle.html

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