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【速搜问答】热备份是什么

问答 admin 3天前 12次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

热备份是在数据库运行的情况下,采用archivelog mode方式备份数据库的方法。即热备份是系统处于正常运转状态下的备份。一旦数据库运行在archivelog状态下,就可以做备份了。

Hot backup is a method of using archivelog mode to backup database when the database is running. Hot backup is the backup when the system is in normal operation. Once the database is running in archivelog state, it can be backed up.

热备份是在数据库运行的情况下,采用 archivelog mode 方式备份数据库的方法。即热备份是系统处于正常运转状态下的备份。所以,如果你有一个冷备份而且又有热备份文件,在发生问题时,就可以利用这些资料恢复更多的信息。热备份要求数据库在 Archivelog()方式下操作,并需要大量的档案空间。一旦数据库运行在 archivelog 状态下,就可以做备份了。

Hot backup is a method of using archivelog mode to backup database when the database is running. Hot backup is the backup when the system is in normal operation. Therefore, if you have a cold backup and a hot backup file, you can use this data to recover more information in case of problems. Hot backup requires the database to operate in archivelog () mode, and requires a lot of file space. Once the database is running in archivelog state, it can be backed up.

与冷备份相对。

As opposed to cold backup.

解释

explain

1、热备份是指在正常情况下,两余度同时工作,当某一余度出现故障时,系统可切除故障余度,启用单余度方式,降级工作.本系统采用热备份方式

1. Hot standby means that under normal conditions, two redundancy work at the same time. When a certain redundancy fails, the system can cut off the fault redundancy, enable the single redundancy mode, and degrade the work

2、有时,我们将在线的备份称为热备份,而将脱机数据备份称为冷备份,以区别两种不同的备份概念.它们能将更多的数据压缩到现有内存中,从而减少访问硬盘(称为虚拟内存)的办法来解决问题

2. Sometimes, we call online backup hot backup and offline data backup cold backup to distinguish two different backup concepts. They can compress more data into existing memory, thus reducing the access to hard disk (called virtual memory) to solve the problem

3、磁盘镜像是一种在其中写往物理驱动器的信息也被写入第二个物理驱动器的一种方法,也称为热备份.它不同于硬盘之间的定时拷贝,作镜像是由智能控制器和一些软件自动地进行的

3. Disk mirroring is a method in which the information written to the physical drive is also written to the second physical drive, also known as hot backup. It is different from the regular copy between hard disks. The image is automatically performed by intelligent controller and some software

电气设备的四种状态

Four states of electrical equipment

运行状态-----指开关闸刀均在合闸位置,所有的继电保护和自动控制装置均已投入,控制,信号,合闸,保护电源均送上

The operating state refers to that the switch blade is in the closing position, all relay protection and automatic control devices have been put into operation, and the control, signal, closing and protection power supply are supplied

热备用状态-----指开关断开而闸刀仍在合闸位置,其它同运行状态

The hot standby state refers to that the switch is disconnected while the switch is still in the closing position, and the others are in the same operation state

冷备用状态-----指开关闸刀均断开,一次设备停电.控制,信号电源断开,设备自身的保护投入,跳其它设备的压板退出,其它设备跳该设备的压板退出

Cold standby state – refers to that the switches and knives are all disconnected, the primary equipment is powered off, the control and signal power supply are disconnected, the protection of the equipment itself is put into operation, the pressing plate of other equipment jumps out, and other equipment jumps the pressure plate of the equipment to exit

检修状态-----指在冷备用的基础上拉开被检修设备两侧的合闸电源并根据检修需要在检修设备各侧装接地线,挂标示牌和装设安全遮栏.

Maintenance status refers to the switching on power supply on both sides of the equipment to be overhauled on the basis of cold standby, and grounding wires, signboards and safety barriers shall be installed on each side of the overhauled equipment according to the maintenance requirements

组成

form

数据文件备份

Data file backup

(1) 设置表空间为备份状态

(1) Set table space to backup state

(2) 备份表空间的数据文件

(2) Backup the data file of the table space

(3) 恢复表空间为正常状态

(3) Restore the table space to normal state

优点

advantage

1. 可在表空间或数据库文件级备份,备份的时间短。

1. It can be backed up at the table space or database file level with short backup time.

2. 备份时数据库仍可使用。

2. The database can still be used during backup.

3. 可达到秒级恢复(恢复到某一时间点上)。

3. It can achieve second level recovery (recovery to a certain point in time).

4. 可对几乎所有数据库实体做恢复

4. Recover almost all database entities

5. 恢复是快速的,在大多数情况下在数据库仍工作时恢复。

5. Recovery is fast, in most cases when the database is still working.

不足之处

deficiencies

1. 不能出错,否则后果严重

1. Do not make mistakes, otherwise the consequences will be serious

2. 若热备份不成功,所得结果不可用于时间点的恢复

2. If the hot backup is not successful, the results can not be used for point in time recovery

3. 因难于维护,所以要特别仔细小心,不允许“以失败告终”。

3. Because it is difficult to maintain, it is necessary to be careful and not to “end in failure”.

相关

relevant

冷备份

Cold backup

冷备份发生在数据库已经正常关闭的情况下,当正常关闭时会提供给我们一个完整的数据库。冷备份时将关键性文件拷贝到另外的位置的一种说法。对于备份 Oracle 信息而言,冷备份是最快和最安全的方法。冷备份的优点是:

Cold backup occurs when the database has been shut down normally. When the database is shut down normally, a complete database will be provided to us. A term used to copy critical files to another location during cold backup. Cold backup is the fastest and safest way to back up Oracle information. The advantages of cold backup are:

1、 是非常快速的备份方法(只需拷文件)

1. Is a very fast backup method (just copy files)

2、 容易归档(简单拷贝即可)

2. Easy to archive (simple copy is enough)

3、 容易恢复到某个时间点上(只需将文件再拷贝回去)

3. Easy to recover to a point in time (just copy the file back)

4、 能与归档方法相结合,做数据库“最佳状态”的恢复。

4. It can be combined with archiving method to restore the “best state” of database.

5、 低度维护,高度安全。

5. Low maintenance, high safety.


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