In this paper attention is concentrated on concept and architecture of Oracle data Guard, and the process of planning, creating physical standby database and logical standby database.

论述了数据库备份的重要性和必要性，介绍了数据库备份的步骤及方法，并通过实例进行了数据库备份、还原操作。

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That's where more than 7,000 National Guard members are on standby and evacuations are expected.

7000多名国家警卫人员待命，撤离也在计划中。

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Texas Gov. Rick Perry put 7, 500 National Guard members on standby Tuesday, his office said.

CNN: Nervous Texas braces for Ike

The Unified Command said three additional tugs are on standby along with the Coast Guard Cutter Alex Haley and two oil spill response vessels.

NPR: Grounded Shell Oil-Drilling Ship Refloated