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You are using Oracle Database 10g. The LOG_ARCHIVE_FORMAT parameter is set to  ’LOG%t_%s_%r.dbf’.  Why is %r used in the file name format？（） 
A:to uniquely identify the archived log files with the restore operation
B:to uniquely identify the archived log files with the redo log group number
C:to uniquely identify the archived log files for each incarnation of the database
D:to uniquely identify the archived log files with the number of recovery operations performed

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出自：Oracle认证

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