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多选题
When a check point occurs the （）. （）. and （） are synchronized.
A
data files
B
control files
C
redo log files
D
parameter files
E
archive log files
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when all the online redo log groups are multiplexed and one of the members of a group is missingB
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when some important tables are deleted from the database and purged from the Recycle Bin
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the value of the UNDO_RETENTION initialization parameterB
the value of the optimal redo log file size provided by the Redo Logfile Size AdvisorC
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the number of redo log members in a group
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单选题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 operationB
to uniquely identify the archived log files with the redo log group numberC
to uniquely identify the archived log files for each incarnation of the databaseD
to uniquely identify the archived log files with the number of recovery operations performed
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