当数据库出现故障时要对数据库进行恢复，恢复的原理是 (5) ，_爱下问搜题

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问题问答题

当数据库出现故障时要对数据库进行恢复，恢复的原理是 (5) ，常用的技术是数据转储和 (6) 。

答案

参考答案：登录日志文件

解析：恢复的基本原理很简单就是冗余，也就是说，数据库中的任何一部分被破坏的或不正确的数据可以根据存储在系统别处的冗余数据来重建。建立冗余数据最常用的是数据转储和登录日志文件。

名词解释

职业定向

完形填空

“Cleverness is a gift while kindness is a choice．Gifts are easy—they're given after all. Choices can be hard．”
I got the to start Amazon 16 years ago．I the fact that the Internet usage was growing at 2300 percent per year．I’d never seen or heard of anything that grew so fast，and the idea of building an bookstore with millions of titles was very to me．I had just turned 30，and I’d been married for a year．I told my wife that I wanted to my job and go to do this crazy thing that probably wouldn’t since most start-ups don’t，and I wasn’t sure what to ．She told me I should the idea．I’d always wanted to be an inventor，and she wanted me to follow my ．
I was working at a financial firm in New York City with a boss that I admired very much．I went to my boss and with him that I wanted to start a company selling books on the Internet．He took me on a long walk in Central Park，listened to me，and finally said，“That sounds like a really good idea， it would be an even better idea for someone who didn’t already have a good job．”That logic made some to me，and he convinced me to think about it for 48 hours making a final decision．Seen in that light，it really was a difficult ，but finally, I decided I had to give it a shot．I didn’t think I’d regret and failing．And I suspected I would always be troubled by the decision not to try at a11．After much ，I took the less path to follow my dream，and I’m of that Choice．For all of us，in the end，we are our choices．

A．got through

C．came across

C．intelligent

A．consideration

B．determination

C．conversation

D．application

D．interesting