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Oracle Core: Essential Internals for DBAs and Developers by Jonathan Lewis

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Log Writer

The log writer has one critical task: copy the contents of the log buffer from memory to disk. The activity surrounding this task has, however, increased over the years to cope with increased volumes of change and higher levels of concurrency. (The requirement has also expanded to allow for the possibility of writing to a remote standby database by way of calls to RFS [remote file server] processes from LNS [network server] processes in 10g and NSS or NSA [redo transport sync/async] processes in 11g.

In earlier versions of Oracle there was just a single contiguous area of memory called the log buffer, and, to a very large extent, the appearance of multiple public and private buffers hasn’t changed the mechanics that Oracle used on ...

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