There is a typo in the body of this question. It should be “Hot” instead of “hoi”.

 

Material:

 

Backup Methods

==============

Hot backup and cold backup are the two methods deployed for a backup.

They are based on the state of the application when the backup is performed.

In a hot backup, the application is up-and-running, with users accessing their data during the backup process. This method of backup is also referred to as an online backup.

A cold backup requires the application to be shut down during the backup process. Hence, this method is also referred to as an offline backup.

The hot backup of online production data is challenging because data is actively used and changed. If a file is open, it is normally not backed up during the backup process. In such situations, an open file agent is required to back up the open file. These agents interact directly with the operating system or application and enable the creation of consistent copies of open files. In database environments, the use of open file agents is not enough, because the agent should also support a consistent backup of all the database components. For example, a database is composed of many files of varying sizes occupying several file systems. To ensure a consistent database backup, all files need to be backed up in the same state. That does not necessarily mean that all files need to be backed up at the same time, but they all must be synchronized so that the database can be restored with consistency. The disadvantage associated with a hot backup is

that the agents usually affect the overall application performance.

 

Answer:

C. Open file agent.

What is required for a successful backup of all files during hoi backup?的更多相关文章

  1. ORA-01146: cannot start online backup - file 1 is already in backup ORA-01110: data file 1: 'C:\ORACLE\ORADATA\ORCL8\SYSTEM01.DBF'

    问题: Error: [1146] ORA-01146: cannot start online backup - file 1 is already in backup ORA-01110: dat ...

  2. [PowerShell] Backup Folder and Files Across Network

    ## This Script is used to backup folder/files and delete the old backup files. ## Author: Stefanie # ...

  3. Symantec Backup Exec 2012 Agent For Linux安装

    Backup Exec 2012 介绍 Backup Exec 2012 是一种为虚拟和物理环境提供保护的集成产品,能够简化备份和灾难恢复,并提供了无可匹敌的恢复功能.借助于强大的 Symantec ...

  4. How to restore and recover a database from an RMAN backup. (Doc ID 881395.1)

    APPLIES TO: Oracle Database - Enterprise Edition - Version 10.1.0.2 to 11.2.0.2 [Release 10.1 to 11. ...

  5. Symantec Backup Exec 2010 Agent For Linux安装

    以前写过一篇文章介绍过Symantec Backup Exec 2012 Agent For Linux安装安装,今天介绍一下Symantec Backup Exec 2010 Agent For L ...

  6. IO is frozen on database xxx, No user action is required

    最近遇到一起关于"I/O is frozen on database xxx. No user action is required. However, if I/O is not resu ...

  7. SQL Server 2014 Backup Encryption

    转载自: Microsoft MVP Award Program Blog 来源:Microsoft MVP Award Program Blog 的博客:https://blogs.msdn.mic ...

  8. [每日一题] 11gOCP 1z0-053 :2013-10-9 backup with the KEEP option....................................33

    转载请注明出处:http://blog.csdn.net/guoyjoe/article/details/12517603 正确答案:AB 在Oracle 11g中,可以使用backup ….keep ...

  9. SharePoint 2013 How to Backup Site Collection Automatically With a PowerShell Script

    In this post I will introduce a way how to run a script for backing up SharePoint data which could b ...

随机推荐

  1. Django web框架之权限管理二

    1. login登录 def login(request): if request.method=="GET": return render(request,'login.html ...

  2. [水煮 ASP.NET Web API2 方法论](1-3)如何接收 HTML 表单请求

    问题 我们想创建一个能够处理 HTML表单的 ASP.NET Web API 应用程序(使用 application/x-www-form-urlencoded 方式提交数据). 解决方案 我们可以创 ...

  3. Druid 架构

    本篇译自 Druid 项目白皮书部分内容( https://github.com/apache/incubator-druid/tree/master/publications/whitepaper/ ...

  4. 深入解析php中的foreach问题

    本篇文章是对php中的foreach问题进行了详细的分析介绍,需要的朋友参考下   前言:php4中引入了foreach结构,这是一种遍历数组的简单方式.相比传统的for循环,foreach能够更加便 ...

  5. LOJ #6280. 数列分块入门 4-分块(区间加法、区间求和)

    #6280. 数列分块入门 4 内存限制:256 MiB时间限制:500 ms标准输入输出 题目类型:传统评测方式:文本比较 上传者: hzwer 提交提交记录统计测试数据讨论   题目描述 给出一个 ...

  6. Spring学习的切入点

    spring是个顶级的框架,这话没毛病.很多人想把它征服,想去阅读它的源码,弄懂它的设计思想,从中学到精粹. 但是很多次打开后,看到庞大的体系结构,就懵逼了,不知从何入手. 我在这里总结下学习spri ...

  7. Tyvj1933绿豆蛙的归宿

    给出一个有向无环图,起点为1终点为N,每条边都有一个长度,并且从起点出发能够到达所有的点,所有的点也都能够到达终点.绿豆蛙从起点出发,走向终点. 到达每一个顶点时,如果有K条离开该点的道路,绿豆蛙可以 ...

  8. Check if a user is in a group

    groups or groups user

  9. Gym 101128F Sheldon Numbers(网络流)

    [题目链接] http://codeforces.com/gym/101128/attachments [题目大意] 给出一张地图,分为高地和低地,高低地的交界线上划有红线, 现在要开小车跨过每条红线 ...

  10. 【计算几何】【凸包】【极角排序】【二分】Gym - 101128J - Saint John Festival

    平面上n个红点,m个黑点,问你多少个黑点至少在一个红三角形内. 对红点求凸包后,转化为询问有多少个黑点在凸包内. 点在凸多边形内部判定,选定一个凸包上的点作原点,对凸包三角剖分,将其他的点极角排序之后 ...