Shulou(Shulou.com)06/01 Report--

RFS:remotefile server . The process is that the standby library accepts the redo information triggered by the lgwr process of the primary library and writes it to the standbyredo log. There is no doubt that the RFS process has to cooperate with other processes, that is, the transport process. Then we need the knowledge of the previous article, we know that triggering synchronization may be triggered by the ARCH or LGWR process, the two are different. If it is triggered by the LGWR process, the LGWR process is also responsible for transmitting the redo information before 10g, and the RFS process is responsible for receiving the redo information and writing it to the standbyredo log. After 10g, it is completed by the LNSn process; if it is triggered by the ARCH process, that is, the archive log transfer is triggered by the ARCH process, and the RFS process is responsible for receiving it, and then writing it to the specified archive location before applying it. Then the different settings here also determine the different settings of the parameter LOG_ARCHIVE_DEST_n.

LNSn:LGWR triggers the process that is really responsible for the transmission, including initializing a series of functions such as the network Imax O.

MRP:managedrecovery process, in short, means that physical standby synchronizes data through this process, and recovers data directly through standbyredo log or archived logs (depending on the mode).

LSP:logicalstandby process: logical standby in the same way as above, except that it takes one more step to convert redo information into sql statements and then recover. You can also see the difference between logical standby and physical standby here.

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