【原】SCN Oracle Start-up Checks

作者：david_zhang@sh 【转载时请以超链接形式标明文章】

链接：http://www.cnblogs.com/david-zhang-index/archive/2012/07/01/2572190.html

oracle数据库启动时，scn检查原则及解决办法：

Condition on Star-Up	Oracle Behavior	DBA Action
CF checkpoint < Datafile checkpoint SCN	"Control file too old"error	Restore a newer control file
CF checkpoint > Datafile checkpoint SCN	Media recovery required	Most likely a datafile has been restored from backup Recovery is now required
CF checkpoint = Datafile checkpoint SCN	Start up normally	None
Database in mount mode,instance thread status = OPEN	Crash recovery required	None

 备注:cf=control file