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[置顶] Oracle 11g Data Guard: How to Change Data Guard Protection Modes
分类: Oracle DataGuard 2013-06-18 09:04 359人阅读评论(0) 收藏举报
Protection ModesMAXIMUM PROTECTIONMAXIMUM PERFORMANCEData GuardMAXIMUM AVAILABILITY
How to Change Data Protection Mode ofa Primary Database
Step 1 Select a dataprotection mode that meets your availability, performance, and data protectionrequirements.
Maximum Availability
This protection mode provides the highest level of data protectionthat is possible promising the availability of a primary
do mit until all redo data needed to recover thosetransactions has been written to the online redo log
and to the standby redolog on at least one synchronized standby database. If the primary databasecannot write its redo stream to at
least one synchronized standby database, itoperates as if it were in maximum performance mode to preserve primary
databaseavailability until it is again able to write its redo stream to a synchronizedstandby database.
This mode ensures that no data loss will occur if the primarydatabase fails, but only if a second fault does not prevent plete set
ofredo data from being sent from the primary database to at least one standbydatabase.
Maximum Performance
This protection mode provides the highest level of data protection