数据备份通常可分为完全备份、增量备份、差分备份和渐进式备份几种方式。其中将系统中所有选择的数据对象进行一次全面的备份,而不管数据对象自上次备份之后是否修改过的备份方式是( )。
- A.完全备份
- B.增量备份
- C.差分备份
- D.渐进式备份
正确答案及解析
正确答案
解析
本题考查数据备份方式。
完全备份:指将系统中所有选择的数据对象进行一次全面的备份。是最基本也是最简单的备份方式;增量备份:指只把最近新生成的或者新修改的文件拷贝到备份设备上;差异备份:对上次备份后所有发生改变的文件都进行备份(包括删除文件的信息);渐进式备份:也称为“只有增量备份”或“连续增量备份”;它是指系统排除完全备份,数据对象只有当发生改变时才被写入到存储介质上;渐进式备份只在初始时做所有数据文件的全部备份,以后只备份新建或改动过的文件,比上述三种备份方式有更少的数据移动;减少了备份时间和所需的存储容量,减轻了网络负担;降低潜在的人为错误。故本题选A。
数据备份是容灾的基础,是指为防止系统出现操作失误或系统故障导致数据丢失,而将全部或部分数据集合从应用主机的硬盘或阵列复制到其它的存储介质的过程。数据备份通常可以分为完全备份,增量备份,差异备份和渐进式备份。
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