SCN在数据库恢复中的应用

 

获得当前scn号
select dbms_flashback.get_system_change_number from dual;

system checkpoint scn:
select checkpoint_change# from v$database;

datafile checkpoint scn:
select checkpoint_change# from v$datafile;

stop scn:
select last_change# from v$datafile;

start scn:
select checkpoint_change# from v$datafile_header;

 

scn号用来确认数据文件是否一致，及是否需要media recovery、instance recovery。详情见下例文章。

 

Oracle SCN机制解析
http://wenku.baidu.com/view/e0602753ad02de80d4d8402b.html

检查点SCN深入研究
http://wenku.baidu.com/view/d6929539376baf1ffc4fad5a.html

写得非常好的一篇关于Oracle的SCN
http://wenku.baidu.com/view/5250630703d8ce2f006623db.html

揭示检查点的秘密
http://space.itpub.net/9842/viewspace-501556

checkpoint RBA 和on-disk RBA的说明
http://blog.csdn.net/wenhuiqiao/article/details/6078270