DBWn会做大量的分散写(scattered write),而LGWR则是向重做日志完成大量的顺序写(sequential write)。分散写比顺序写慢多了,通过在SGA中缓存脏块,并由LGWR进程完成大规模顺序写(可能重建这些脏缓冲区),这样可以提升性能。
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sequential read write 连续读写
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With sequential write behind, pages do not stay in memory until the syncd daemon runs, which can cause real bottlenecks.
在使用延迟的顺序写操作时,在syncd守护进程运行之前,页面并不留在内存中,这可能会导致实际的瓶颈。
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As the buffer fills the older write data is transferred to the HDD in a sequential manner, optimized for HDD storage.
FORBES: Will A Fusion Drive Approach Become Widespread in Computers?
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