首先是查詢v$archived_log視圖，然后分析applied字段信息，官方說明如下：

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.

來自 “ ITPUB博客 ” ，鏈接：http://blog.itpub.net/29802484/viewspace-2156048/，如需轉載，請注明出處，否則將追究法律責任。

總結

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