ALTER SYSTEM CHECKPOINT 手工检查点操作
SYSTEM CHECKPOINT SCN 系统检查点SCN ; 存在于控制文件
Internal system checkpoint 内置系统还原点
External system checkpoint 外置系统还原点
Checkpoint System 保点系统
The impairment of checkpoint system 机制受损
system schedule checkpoint 系统调度检查点
system scheduled checkpoint 系统调度检查点
Without logical logs, the system is restored to a consistent point, which is the archive checkpoint.
如果没有逻辑日志，则系统被还原到某个一致的点上，即归档检查点。
If the current checkpoint was invalid, the file system need only step back to the last good checkpoint for a valid file system.
如果当前检查点失效，文件系统只需回滚到上一个有效的检查点，重新获得有效的文件系统。
If a crash occurs, the journal can be used as a checkpoint to recover unsaved information and avoid corrupting file system metadata.
一旦系统发生崩溃，日志文件就会起到一个检查点的作用，用于恢复未保存的信息，防止损坏文件系统元数据。
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