• 1. 可以重写备份优化
  backup archivelog all/like .....backup .. force可以重写备份优化...configure retention policy to redundancy n;
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1. If the main device fails, the backup can take over, duplicating all the encryption parameters, that were in force. 
   如果主设备失灵，备用设备可切换过来，将所有有效的加密参数复制下来。
2. A many-channeled and multi-level financing system for science and technology projects should be set up with the Government as the driving force, the enterprises as the mainstay, and the banks as the backup.  
   建立了以政府为龙头、企业为主体、银行为后盾的多渠道、多层次的科技投入体系。
3. Backup! Let us in! 
   退后点！让我们进去！
4. A backup in the sink; a backup of traffic at the drawbridge. 
   下水道堵塞；吊桥上的交通阻塞
5. 5. Developing Human Resource backup for the Olympic Games 
   (五)加强人力资源开发，为奥运会提供可靠人才保障

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