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首先是查询v$archived_log视图，然后分析applied字段信息，官方说明如下：
Indicates whether an archived redo log file has been applied to the
corresponding physical standby database. The value is always NO for local
destinations.
This column is meaningful on a physical standby database for rows where
REGISTRAR = RFS:
■ If REGISTRAR = RFS and APPLIED = NO, then the log file has been
received but has not yet been applied.
■ If REGISTRAR = RFS and APPLIED = IN-MEMORY, then the log file has
been applied in memory, but the datafiles have not yet been updated.
■ If REGISTRAR = RFS and APPLIED = YES, then the log file has been
applied and the datafiles have been updated.
This column can be used to identify log files that can be backed up and
deleted. When used for this purpose, the value IN-MEMORY should be
treated as if it were NO.
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