当发出这个命令时，处于联机备份模式的所有数据文件都将被发放检查点SCN。
When this command is issued, all data files that are in the online backup mode will be issued checkpoint SCN.
对于没有处在联机备份模式的那些数据文件，随后的检查点将在它们的文件头中添加scn。
For those data files not in the online backup mode, subsequent checkpoint will increase the SCN in their headers.
当发出“AlterTablespace ts_nameEndBackup”时，在联机备份数据文件的的文件头中再次记录了检查点scn。
When Alter Tablespace ts_name End backup is issued, again a checkpoint SCN is recorded at the headers of online backup data files.
检查点(CKPt)——将数据文件头和控制文件头与当前重做日志和检查点数同步。
Checkpoint (CKPt) - Synchronizes the headers of data files and control files with the current redo log and checkpoint Numbers.
检查点(CKPt)——将数据文件头和控制文件头与当前重做日志和检查点数同步。
Checkpoint (CKPt) - Synchronizes the headers of data files and control files with the current redo log and checkpoint Numbers.
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