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The page out operation
Oracle Tips by Burleson Consulting
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The page out operation
UNIX will commonly page out RAM pages in anticipation of
additional demands on the RAM memory region. This
asynchronous writing of RAM pages is generally done for all
memory regions that are marked as swappable. For details on
making the Oracle SGA non-swappable, please see the special
init.ora parameters described later in this chapter.
In sum, a page-out does not cause the RAM memory region to
be physically moved out of the RAM, and it is only a
preparatory phase. In case UNIX decides to flush the region
from RAM, he will have already copied the RAM contents to
the swap disk.
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