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.

最大效能保護，最大資料保護，最大可用性，LGWR, ARCH

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