what is the significance of swap space in disk
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Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it should not be considered a replacement for more RAM.
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A computer has sufficient amount of physical memory but most of times we need more so we swap some memory on disk. Swap disk is a space in hard disk which is a substitute of physical memory. Swap memory is a portion of virtual memory that is on the hard disk , used when RAM is full
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