多选题Which three tasks can be performed using a duplicate database?（）ATesting the backup and recovery proceduresBTesting the upgrade of an Oracle database to a new releaseCTesting the effect of an application changes on database performanceDContinuously updating archive log files from the target database to support failover
多选题
Which three tasks can be performed using a duplicate database?（）
A
Testing the backup and recovery procedures
B
Testing the upgrade of an Oracle database to a new release
C
Testing the effect of an application changes on database performance
D
Continuously updating archive log files from the target database to support failover
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