此为11g的bug，需要在delete后加上force关键字，如下：

RMAN-08137 When deleting archivelogs even when Streams CAPTURE does not require them [ID 1079953.1]

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Symptoms

Applies To: 11gR1-11gR2

RMAN is unable to delete archive logs from database even though they are not needed by CAPTURE process anymore.

Changes

 

Cause

In 11g, RMAN looks at MIN_REQUIRED_CAPTURE_CHANGE# in v$database and not at DBA_CAPTURE. By default this value is updated every 6 hours. So by default the value in v$database will be six hours behind the current value.

Solution

Since changing frequency of update to MIN_REQUIRED_CAPTURE_CHANGE# in v$database can not be controlled, following workaround can be used:

Archive log which are not needed by capture process can be deleted using:

delete noprompt force archivelog all completed before 'sysdate-10/1440';