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What type of protection is implemented when the DBA issues the ALTER DATABASE SET STANDBY DATABASE PROTECTED； command？（）
A:The standby database is protected against write operations. 
B:The primary database is protected against write operations. 
C:The primary database is protected against data loss and data divergence. 
D:The standby database is protected against data loss and data divergence. 

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出自：Oracle认证

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