oracle双机、rac、dataguard区别（oracle双机、rac、dataguard区别）.docVIP

oracle双机、rac、dataguard区别（oracle双机、rac、dataguard区别） The difference between Oracle and /RAC/Dataguard Data Guard is a remote replication technology of Oracle, it has the physical and logical points, but in general, it needs to have an independent system in different places, it can be different system two sets of hardware, but the software structure of these two systems are consistent, including the software version of the directory storage structure. As well as data synchronization (in fact is not the real time synchronization between the two systems), as long as the network is through it, is a solution for remote disaster recovery. As for RAC, it is the local high availability cluster, each node is used to share the same application or not, in order to solve the low efficiency of operation, single node failure of such problems, it is a few hardware of the same or different server, plus a SAN (shared memory region) to a. Data Guard consists of two more independent databases, they each have their own storage, Oracle is responsible for switching and data synchronization between them Dual computer hot standby is composed of two computers and a shared storage device, and it can be switched through third party software (HA, Rose, etc.) without data synchronization It is recommended to apply RAC+Dataguard, RAC to ensure availability, and Dataguard to guarantee reliability on RAC groups, on separate disks, and on another host. Hot backup is what people say, the database on a shared device, at the same time there can be a host to take over, another use, this way can only protect the example, cant protect dB, and preparation of machine idle long, is a great waste of resources! If it was originally a dual computer, it is recommended to convert to RAC Planning applications, DML operations run from one node, query operations run from another node, usually without the need for too much tuning to take advantage of another unused machine The RAC server uses a set of storage, service