是当前分叉点的日志序列号。
基于日志序列的恢复是恢复直到指定日志序列号(只有在使用Recovery Manager时才可用)的恢复。
Log sequence-based recovery log sequence-based recovery is a recovery that recovers until the specified log sequence number (only available when using recovery Manager).
resetlogs只表明重新设置了重做日志的序列号。
Resetlogs simply means the sequence number for the redo logs is reset.
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