ALTER SYSTEM CHECKPOINT 手工检查点操作
SYSTEM CHECKPOINT SCN 系统检查点SCN
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
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