Oracle Data Guard, Oracle Data Guard Broker and Oracle Active Data Guard are the commercial names for technologies that allows physical and logical standby (slave) databases to be configured and managed with Oracle Database Enterprise Edition.

These should not be confused with other data replication and integration technologies, such as Oracle Streams, Oracle Advanced Replication and Oracle Golden Gate - although the latter does include a license to use Oracle Active Data Guard when Oracle Golden Gate is licensed in combination with Oracle Enterprise Edition.

Official Product Page of Oracle Data Guard

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