RAC：Oracle rac enables multiple independent servers that are linked by an interconnect to share access to database,providing ha,scalability,and redundancy during failure.RAC provide the benefit of the system failure,such as node failures and instance crashes;
DG：dg ensures ha,data protection,and disaster recovery for enterprise data,it provide the benefit of the site failure.
Flashback Database ：it provide fast recovery from logical data corruption and user errors.
RMAN ：it is an utility that simplifies backing up,restoring,and recovering database files.
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