Extended Oracle RAC vs. Oracle Data Guard
Extended Oracle RAC is a high availability solution that can be used as a limited disaster recovery solution. It does not replace the functionalities of Oracle Data Guard, which is a true disaster recovery solution. If you are looking for a true disaster recovery solution, Oracle Data Guard can be considered in conjunction with extended Oracle RAC. Oracle Data Guard can be used to overcome the intrinsic limitations imposed by the extended Oracle RAC. It also offers the following advantages over extended Oracle RAC:
Network efficiency Oracle Data Guard does not require expensive DWDM or dark fiber technologies ...
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