单项选择题
You issue this statement：ALTER DATABASE BACKUP CONTROLFILE TO TRACE； What does the statement generate？（）
A.A text copy of the control file. B.A binary copy of the control file. C.A file containing a SQL statement which will re-create the database. D.A file containing a SQL statement which will re-create the control file.
单项选择题 Whichstatementistrueregardingcheckpointsandrecovery？（）
单项选择题 Inuser-managedbackupandrecoverprocedures，howaredatafilesbackedup？（）
单项选择题 ToincreasetheavailabilityofanAdvancedReplicationenvironment，youcanaddanewmastertoareplicationgroupwithoutquiescingthegroup.Thisisachieved（）.
