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最大性能保护,最大数据保护,最大可用性,LGWR, ARCH

原创 Linux操作系统 作者:tolywang 时间:2009-03-06 10:17:43 2 删除 编辑

https://students.kiv.zcu.cz/doc/oracle/server.102/b14239/log_transport.htm#i1267904

Table 5-2 Minimum Requirements for Data Protection Modes


Maximum Protection Maximum Availability Maximum Performance

Redo archival process

LGWR

LGWR

LGWR or ARCH

Network transmission mode

SYNC

SYNC

SYNC or ASYNC when using LGWR process. SYNC if using ARCH process

Disk write option

AFFIRM

AFFIRM

AFFIRM or NOAFFIRM

Standby redo log required?

Yes

Yes

No, but it is recommended


Note:

Oracle recommends that a Data Guard configuration that is running in maximum protection mode contains at least two standby databases that meet the requirements listed in Table 5-2. That way, the primary database can continue processing if one of the standby databases cannot receive redo data from the primary database.
 

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