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Answer Posted / mohapatra.gouranga@gmail.com
Data Guard Redo Transport Services coordinate the
Log Network Server (LNS);
transmission of redo from the primary database to the
standby database, at the same time the LGWR is processing
redo, a separate Data Guard process called the Log Network
Server (LNS) is reading from the redo buffer in the SGA and
passes redo to Oracle Net Services from transmission to a
standby database, it is possible to direct the redo data to
nine standby databases, you can also use Oracle RAC and
they don't all need to be a RAC setup. The process Remote
File Server (RFS) receives the redo from LNS and writes it
to a sequential file called a standby redo log file (SRL),
the LNS process support two modes synchronous and
asynchronous.
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