You are managing a 24*7 database. The backup strategy for the database is to perform user-managed backups. Identify two prerequisites to perform the backups.（）

What purpose would you achieve by enabling the block change tracking feature？（） A:  Eliminate the necessity for backups. B:  Perform optimized image copy backups. C:  Perform optimized incremental backups. D:  Enable checkpoint （CKPT） to perform checkpointing at every block change. E:  Enable database writer （DBWn） to write changed blocks to data files faster.

Which three features are provided by Recovery Manager and NOT provided by user-managed backup and recovery？（） A: Online backups. B: Skipping unused block.  C: Partial database backups. D: Incremental block-level backup. E: Detection of corrupted blocks during backup.

Which three features are provided by Recovery Manager and NOT provided by user-managed backup and recovery？（） A: AOnline backups. B: BSkipping unused block. C: CPartial database backups. D: DIncremental block-level backup. E: EDetection of corrupted blocks during backup.

Revit软件能够设置保存的备份数。One can set the number of backups saved.

What command would you issue to enable automated backups of control files? （） A: alter database controlfile autobackuon B: alter system controlfile autobackup on  C: configure controlfile autobackup on  D: enable controlfile autobackup

What command would you issue to enable automated backups of control files? （） A: alter database controlfile autobacku on B: alter system controlfile autobackup on C: configure controlfile autobackup on D: enable controlfile autobacku

What command would you issue to enable automated backups of control files？（） A:  alter database controlfile autobackup on B:  alter system controlfile autobackup on C:  configure controlfile autobackup on D:  enable controlfile autobackup

Which of the following is not a typical maintenance task within a network maintenance model？（） A: Providing technical customer support B: Changing configurations C: Updating software D: Monitoring network performance E: Replacing hardware F: Scheduling backups

When scaling Coherence from one to two cache servers， it will not show the same scalability as two to four. Why？（） A:  Coherence uses a more efficient TCMP algorithm going from two to four cache servers B:  When going from one to two cache servers， object backups are copied across servers so work is doubled，but going from two to four is a fixed amount of work C:  Near cache is enabled with a larger quorum thus performance is improved D:  all of the above